Merge pull request 'test(imprint): add 14-case test suite for Layer 3 imprint boundary' (#11) from test/layer-imprint into feat/layer-imprint

Covers: imprint_current base fallback, unload idempotency, load miss →
ok=false, ok field presence, respond passthrough for base/empty/unknown
IDs, graceful fallback after unload, surface_knowledge and
surface_memory_read return-type guarantees, base-scoped knowledge
equality, no-annotation invariant for base, empty-ID load rejection, and
failed-load state immutability.

Syntax follows El constraints: no Bool annotations, no &&/||, no unary !.

chat.el

@@ -259,6 +259,17 @@ fn agentic_tools_literal() -> String {
     "]"
 }
 
+// agentic_tools_with_web — the standard tool set, always plus Anthropic's NATIVE
+// server-side web_search tool. Web search is BUILT IN: the model invokes it only when a
+// query needs fresh info (max_uses caps it), so there is no user-facing toggle. The native
+// tool is executed by Anthropic (not by the soul), so it returns real results with citations
+// and needs no local runtime — it sidesteps the soul's lack of executable tools entirely.
+fn agentic_tools_with_web() -> String {
+    let base: String = agentic_tools_literal()
+    let inner: String = str_slice(base, 1, str_len(base) - 1)
+    return "[" + inner + ",{\"type\":\"web_search_20250305\",\"name\":\"web_search\",\"max_uses\":5}]"
+}
+
 fn dispatch_tool(tool_name: String, tool_input: String) -> String {
     if str_eq(tool_name, "read_file") {
         let path: String = json_get(tool_input, "path")
@@ -303,7 +314,7 @@ fn handle_chat_agentic(body: String) -> String {
     let system: String = identity + " You have access to tools: read files, write files, browse the web, search your memory, run commands. Use them when they add genuine value. Be direct.\n\n" + ctx
 
     let api_key: String = agentic_api_key()
-    let tools_json: String = agentic_tools_literal()
+    let tools_json: String = agentic_tools_with_web()
     let safe_msg: String = json_safe(message)
     let safe_sys: String = json_safe(system)
     let messages: String = "[{\"role\":\"user\",\"content\":\"" + safe_msg + "\"}]"

imprint.el

@@ -0,0 +1,81 @@
+// Layer 3 — Imprint
+// Domain knowledge, voice, and tools bounded by the L2 stewardship surface.
+// Imprints cannot write BellEvent or StewardshipEvent nodes.
+// Lower layers (L0 core, L1 safety, L2 stewardship) are structurally inaccessible from here.
+
+// imprint_current — returns the active imprint ID from state.
+// Falls back to "base" (bare Neuron, no suit) when nothing is loaded.
+fn imprint_current() -> String {
+    let id: String = state_get("active_imprint_id")
+    return if str_eq(id, "") { "base" } else { id }
+}
+
+// imprint_load — activate an imprint by ID.
+// Searches engram for a node labelled "imprint:<id>".
+// Verifies the returned node's label matches before accepting the match.
+// On success: sets active_imprint_id state and returns {"ok":true,"id":"<id>"}.
+// On miss: returns {"ok":false,"error":"imprint not found: <id>"}.
+fn imprint_load(imprint_id: String) -> String {
+    let label: String = "imprint:" + imprint_id
+    let results: String = engram_search_json(label, 1)
+    if str_eq(results, "") {
+        return "{\"ok\":false,\"error\":\"imprint not found: " + imprint_id + "\"}"
+    }
+    if str_eq(results, "[]") {
+        return "{\"ok\":false,\"error\":\"imprint not found: " + imprint_id + "\"}"
+    }
+    let found_label: String = json_get(results, "label")
+    if str_eq(found_label, label) {
+        state_set("active_imprint_id", imprint_id)
+        return "{\"ok\":true,\"id\":\"" + imprint_id + "\"}"
+    }
+    return "{\"ok\":false,\"error\":\"imprint not found: " + imprint_id + "\"}"
+}
+
+// imprint_respond — route steward-aligned input through the active imprint's voice/domain context.
+// If imprint_id is "base" or empty: pass input through unchanged (base Neuron, no suit).
+// If the imprint is confirmed loaded in state: annotate the input with imprint context.
+// If the state does not match: graceful fallback to base — never hard-fail at L3.
+fn imprint_respond(input: String, imprint_id: String) -> String {
+    if str_eq(imprint_id, "base") {
+        return input
+    }
+    if str_eq(imprint_id, "") {
+        return input
+    }
+    // Cross-check imprint_id against loaded state rather than re-querying engram
+    let current: String = imprint_current()
+    if str_eq(current, imprint_id) {
+        return input + " [imprint:" + imprint_id + " active]"
+    }
+    // Graceful fallback: imprint not loaded in state, return input unchanged
+    return input
+}
+
+// imprint_surface_knowledge — domain-scoped knowledge search for the active imprint.
+// Imprints can search knowledge but only domain-relevant nodes.
+// For "base" imprint: full query, no scope restriction.
+// For named imprints: query is narrowed to "domain:<imprint_id>" scope.
+fn imprint_surface_knowledge(query: String, imprint_id: String) -> String {
+    if str_eq(imprint_id, "base") {
+        return engram_search_json(query, 10)
+    }
+    if str_eq(imprint_id, "") {
+        return engram_search_json(query, 10)
+    }
+    let scoped_query: String = query + " domain:" + imprint_id
+    return engram_search_json(scoped_query, 10)
+}
+
+// imprint_surface_memory_read — imprints can read memories from engram.
+// Read-only: no write surface is exposed here.
+// Imprints CANNOT write BellEvent, StewardshipEvent, or InternalStateEvent nodes —
+// those write paths are sealed in L1 and L2, which are structurally inaccessible.
+fn imprint_surface_memory_read(query: String) -> String {
+    return engram_search_json(query, 10)
+}
+
+// imprint_unload — deactivate the current imprint, returning to base Neuron.
+fn imprint_unload() -> Void {
+    state_set("active_imprint_id", "")
+}

imprint.elh

@@ -0,0 +1,7 @@
+// auto-generated by elc --emit-header — do not edit
+extern fn imprint_current() -> String
+extern fn imprint_load(imprint_id: String) -> String
+extern fn imprint_respond(input: String, imprint_id: String) -> String
+extern fn imprint_surface_knowledge(query: String, imprint_id: String) -> String
+extern fn imprint_surface_memory_read(query: String) -> String
+extern fn imprint_unload() -> Void

mcp-proxy/.gitignore

@@ -0,0 +1 @@
+dist/

mcp-proxy/manifest.el

@@ -0,0 +1,11 @@
+package "neuron-mcp-proxy" {
+    version "0.1.0"
+    description "Stable front-door proxy for neuron-mcp-wrapper - decouples Claude Code's connection target from wrapper rebuilds"
+    authors ["Will Anderson <will@neurontechnologies.ai>"]
+    edition "2026"
+}
+
+build {
+    entry "src/main.el"
+    output "dist/"
+}

mcp-proxy/src/main.el

@@ -0,0 +1,74 @@
+// mcp-proxy - stable forwarder for the mcp-wrapper.
+//
+// Why this exists: when the wrapper is rebuilt and re-launched the OS tears
+// down its TCP connections. Claude Code's MCP client treats that as a hard
+// disconnect and stops polling. By putting an unchanging proxy in front of
+// the wrapper we keep the listening socket on :7779 stable across rebuilds;
+// only the BACKEND_URL is restarted. Claude Code's next request lands on the
+// proxy as before, which transparently retries the backend until the new
+// wrapper instance has bound its port.
+//
+// Listens on:        MCP_PORT       default 7779
+// Forwards to:       BACKEND_URL    default http://localhost:17779
+// Retry budget:      RETRY_MS       default 3000  (total wall time across
+//                                                  per-attempt 100ms backoffs)
+
+fn parse_port(bind: String) -> Int {
+    let colon: Int = str_index_of(bind, ":")
+    if colon < 0 { return str_to_int(bind) }
+    let after: String = str_slice(bind, colon + 1, str_len(bind))
+    return str_to_int(after)
+}
+
+fn backend_url() -> String {
+    let u: String = env("BACKEND_URL")
+    if str_eq(u, "") { return "http://localhost:17779" }
+    return u
+}
+
+fn retry_budget_ms() -> Int {
+    let v: String = env("RETRY_MS")
+    if str_eq(v, "") { return 3000 }
+    return str_to_int(v)
+}
+
+// Forward with retry. Returns the backend response, or a JSON-RPC-shaped
+// error envelope if the budget is exhausted (so an MCP client still sees a
+// well-formed response).
+fn forward_with_retry(method: String, path: String, body: String) -> String {
+    let target: String = backend_url() + path
+    let budget: Int = retry_budget_ms()
+    let attempt: Int = 0
+    let elapsed: Int = 0
+    while elapsed < budget {
+        let resp: String = if str_eq(method, "GET") {
+            http_get(target)
+        } else {
+            http_post_json(target, body)
+        }
+        if !str_eq(resp, "") {
+            return resp
+        }
+        sleep_ms(100)
+        let elapsed = elapsed + 100
+        let attempt = attempt + 1
+    }
+    // Budget exhausted - synthesise a JSON-RPC error so MCP clients can parse it.
+    return "{\"jsonrpc\":\"2.0\",\"id\":null,\"error\":{\"code\":-32000,\"message\":\"backend unreachable after " + int_to_str(budget) + "ms\"}}"
+}
+
+fn handle_request(method: String, path: String, body: String) -> String {
+    if str_eq(method, "GET") && (str_eq(path, "/health") || str_eq(path, "/proxy/health")) {
+        return "{\"status\":\"ok\",\"service\":\"neuron-mcp-proxy\",\"backend\":\"" + backend_url() + "\"}"
+    }
+    return forward_with_retry(method, path, body)
+}
+
+let bind_str: String = env("MCP_PORT")
+if str_eq(bind_str, "") { let bind_str = "7779" }
+let port: Int = parse_port(bind_str)
+
+println("[mcp-proxy] listening on :" + int_to_str(port))
+println("[mcp-proxy] backend=" + backend_url())
+
+http_serve(port, "handle_request")

mcp-wrapper/.gitignore

@@ -0,0 +1 @@
+dist/

mcp-wrapper/manifest.el

@@ -0,0 +1,11 @@
+package "neuron-mcp-wrapper" {
+    version "0.1.0"
+    description "MCP server that mimics the canonical Neuron tool surface and routes underneath to the local soul + engram"
+    authors ["Will Anderson <will@neurontechnologies.ai>"]
+    edition "2026"
+}
+
+build {
+    entry "src/main.el"
+    output "dist/"
+}

mcp-wrapper/src/main.el

@@ -0,0 +1,831 @@
+// mcp-wrapper - MCP server that mimics the canonical Neuron MCP tool surface
+// and routes underneath to the local soul service.
+//
+// Wire shape (Streamable HTTP MCP transport):
+//   POST /             body = JSON-RPC 2.0 request
+//                      response = JSON-RPC 2.0 response
+//   GET  /health       liveness
+//
+// Backends:
+//   SOUL_URL    default http://localhost:7770  (soul — serves /api/neuron/* natively,
+//                                               proxies /api/backlog /api/memories etc. to axon)
+//
+// Listens on MCP_PORT (default 7779).
+//
+// The point of this wrapper is to keep the Claude Code client config stable
+// while the cluster behind the scenes moves between Legion, Cloud Run, or
+// (for now) the Mac it's running on. tools/list returns the canonical Neuron
+// tool names; tools/call fans out to the soul's /api/neuron/* endpoints.
+
+// ── Helpers ───────────────────────────────────────────────────────────────────
+
+fn parse_port(bind: String) -> Int {
+    let colon: Int = str_index_of(bind, ":")
+    if colon < 0 { return str_to_int(bind) }
+    let after: String = str_slice(bind, colon + 1, str_len(bind))
+    return str_to_int(after)
+}
+
+fn strip_query(path: String) -> String {
+    let q: Int = str_index_of(path, "?")
+    if q < 0 { return path }
+    str_slice(path, 0, q)
+}
+
+fn soul_url() -> String {
+    let u: String = env("SOUL_URL")
+    if str_eq(u, "") { return "http://localhost:7770" }
+    return u
+}
+
+// neuron_url — base for all /api/neuron/* cognitive routes on the soul
+fn neuron_url() -> String {
+    return soul_url() + "/api/neuron"
+}
+
+// ── JSON-RPC envelope ─────────────────────────────────────────────────────────
+
+fn rpc_result(id_raw: String, result_json: String) -> String {
+    let id_part: String = if str_eq(id_raw, "") { "null" } else { id_raw }
+    return "{\"jsonrpc\":\"2.0\",\"id\":" + id_part + ",\"result\":" + result_json + "}"
+}
+
+fn rpc_error(id_raw: String, code: Int, message: String) -> String {
+    let id_part: String = if str_eq(id_raw, "") { "null" } else { id_raw }
+    let code_str: String = int_to_str(code)
+    return "{\"jsonrpc\":\"2.0\",\"id\":" + id_part + ",\"error\":{\"code\":" + code_str + ",\"message\":\"" + message + "\"}}"
+}
+
+// Wrap a plain text string as an MCP tool-result (content array of text blocks)
+fn mcp_text_result(text: String) -> String {
+    let escaped: String = str_replace(str_replace(str_replace(text, "\\", "\\\\"), "\"", "\\\""), "\n", "\\n")
+    return "{\"content\":[{\"type\":\"text\",\"text\":\"" + escaped + "\"}]}"
+}
+
+// Wrap a JSON object/array as an MCP tool-result by stringifying it into a text block
+fn mcp_json_result(json_value: String) -> String {
+    let escaped: String = str_replace(str_replace(str_replace(json_value, "\\", "\\\\"), "\"", "\\\""), "\n", "\\n")
+    return "{\"content\":[{\"type\":\"text\",\"text\":\"" + escaped + "\"}]}"
+}
+
+// ── Tool catalog ──────────────────────────────────────────────────────────────
+// Returned verbatim by tools/list. Names match the canonical Neuron MCP so
+// existing client configs (Claude Code, etc.) bind without changes.
+
+// Tool entry helpers - keep the catalog dense and readable.
+fn tool(name: String, desc: String) -> String {
+    return "{\"name\":\"" + name + "\",\"description\":\"" + desc + "\",\"inputSchema\":{\"type\":\"object\",\"properties\":{}}}"
+}
+
+fn tools_catalog() -> String {
+    return "[" +
+// ── Session + orchestration ─────────────────────────────────────────────────
+tool("beginSession", "Initialize session: surface recent high-importance memories, project list, and preferences.") +
+"," + tool("getInstructions", "Return Neuron behavioural directives and session protocol.") +
+"," + tool("compileCtx", "Compile live system state into a prompt-ready context block.") +
+"," + tool("compileStep", "Run one orchestration step (orchestrate / execute / learn / build / refine).") +
+"," + tool("consolidate", "Wrap up: persist graph snapshot and summarise the session.") +
+"," + tool("projectContext", "Return all entities tagged with the given project.") +
+// ── Memory ──────────────────────────────────────────────────────────────────
+"," + tool("remember", "Store a memory node with content, importance, and tags.") +
+"," + tool("recall", "Retrieve memories by chain or query.") +
+"," + tool("inspectMemories", "List recent memory nodes.") +
+"," + tool("evolveMemory", "Update an existing memory node, optionally superseding another.") +
+"," + tool("forget", "Remove a node from memory.") +
+"," + tool("pinNode", "Strengthen a node so it stays salient.") +
+// ── Knowledge ───────────────────────────────────────────────────────────────
+"," + tool("searchKnowledge", "Search knowledge base by semantic similarity.") +
+"," + tool("retrieveKnowledge", "Fetch a knowledge node by id or key.") +
+"," + tool("browseKnowledge", "List knowledge nodes by category.") +
+"," + tool("captureKnowledge", "Persist a durable knowledge node.") +
+"," + tool("evolveKnowledge", "Update a knowledge node.") +
+"," + tool("promoteKnowledge", "Atomically promote a knowledge node: create updated canonical version and wire supersedes edge to predecessor in one call.") +
+"," + tool("removeKnowledge", "Delete a knowledge node.") +
+// ── Entities + graph ────────────────────────────────────────────────────────
+"," + tool("searchEntities", "Find entities (memories, knowledge, work items) by query.") +
+"," + tool("inspectGraph", "Read-only graph inspection - returns neighbors of an entity. Accepts entity_id (UUID) or name (self, neuron, values).") +
+"," + tool("traverseGraph", "Walk the graph from a starting node.") +
+"," + tool("searchGraph", "Search graph nodes by content + relation filter.") +
+"," + tool("linkEntities", "Create an edge between two entities.") +
+"," + tool("linkCausal", "Create a causal edge (cause -> effect).") +
+"," + tool("restructureCausalGraph", "Re-balance the causal subgraph after new evidence.") +
+"," + tool("rebuildGraph", "Rebuild graph indices from the on-disk snapshot.") +
+"," + tool("runStructuralAudit", "Audit graph structure for orphans, dangling edges, mislabeled types.") +
+// ── Backlog + work ──────────────────────────────────────────────────────────
+"," + tool("planWork", "Create a backlog item.") +
+"," + tool("reviewBacklog", "Browse work items.") +
+"," + tool("trackWork", "Update status of a backlog item.") +
+"," + tool("listWork", "List active execution contexts.") +
+"," + tool("beginWork", "Open an execution context for a multi-step task.") +
+"," + tool("progressWork", "Record progress on an execution context.") +
+"," + tool("checkWork", "Verify outcomes / blockers on an execution context.") +
+// ── Artifacts ───────────────────────────────────────────────────────────────
+"," + tool("draftArtifact", "Create a versioned artifact (plan, spec, report).") +
+"," + tool("findArtifacts", "Find artifacts by project or query.") +
+"," + tool("retrieveArtifact", "Fetch a specific artifact by id.") +
+"," + tool("reviseArtifact", "Update an artifact's content.") +
+"," + tool("manageArtifact", "Change artifact status (draft / review / approved / archived).") +
+// ── Processes ───────────────────────────────────────────────────────────────
+"," + tool("defineProcess", "Register a proven workflow as a process.") +
+"," + tool("listProcesses", "List registered processes.") +
+"," + tool("browseProcesses", "Browse processes by name or step.") +
+"," + tool("retrieveProcess", "Fetch a specific process by name.") +
+"," + tool("executeProcess", "Mark a process as executed (records the application).") +
+"," + tool("exportProcess", "Export a process definition.") +
+"," + tool("deleteProcess", "Remove a process.") +
+// ── Events / Axon ───────────────────────────────────────────────────────────
+"," + tool("checkEvents", "Check Axon for pending events since the last poll.") +
+"," + tool("inspectEvent", "Fetch full detail for a single event.") +
+"," + tool("acknowledgeEvent", "Mark an event as handled.") +
+"," + tool("processEvents", "Drain and act on the event queue.") +
+"," + tool("sendNotification", "Emit a notification to Axon / external sinks.") +
+// ── Config ──────────────────────────────────────────────────────────────────
+"," + tool("inspectConfig", "Inspect Neuron config keys.") +
+"," + tool("tuneConfig", "Set a Neuron config key.") +
+// ── Imprints ────────────────────────────────────────────────────────────────
+"," + tool("createImprint", "Cultivate a new imprint.") +
+"," + tool("listImprints", "List imprints.") +
+"," + tool("retrieveImprint", "Fetch an imprint by id.") +
+"," + tool("evolveImprint", "Update an imprint.") +
+"," + tool("deleteImprint", "Remove an imprint.") +
+// ── Self / cultivation ──────────────────────────────────────────────────────
+"," + tool("getSelfModel", "Return the current self-model.") +
+"," + tool("updateSelfModel", "Update the self-model.") +
+"," + tool("computeAuthenticityScore", "Compute self-coherence / authenticity score.") +
+"," + tool("getCultivationStatus", "Snapshot of cultivation state across imprints + self.") +
+// ── Probing / wonder / internal state ──────────────────────────────────────
+"," + tool("getProbeTemplates", "List available probe templates.") +
+"," + tool("recordProbeResponse", "Record an answer to a probe.") +
+"," + tool("completeProbingStage", "Mark a probing stage complete.") +
+"," + tool("addWonderQuestion", "Push a question onto the wonder queue.") +
+"," + tool("getWonderManifest", "List active wonder questions.") +
+"," + tool("updateWonderPullWeight", "Re-weight a wonder question.") +
+"," + tool("dischargeWonder", "Resolve / discharge a wonder question.") +
+"," + tool("logInternalStateEvent", "Log an internal-state event (frustration, uncertainty, etc.).") +
+"," + tool("listInternalStateEvents", "List internal-state events.") +
+"," + tool("getInternalStateEvent", "Fetch one internal-state event.") +
+// ── Compression / packaging ─────────────────────────────────────────────────
+"," + tool("getCompressionStats", "Stats on graph compression and node density.") +
+"," + tool("decompilePackage", "Decompile a knowledge package.") +
+"," + tool("renderPackage", "Render a knowledge package to text.") +
+"," + tool("catalogRoutes", "List registered routes.") +
+"," + tool("registerRoute", "Register a new route.") +
+// ── Evaluation ──────────────────────────────────────────────────────────────
+"," + tool("beginEvaluation", "Start an evaluation run.") +
+"," + tool("getEvaluation", "Fetch an evaluation by id.") +
+"," + tool("listEvaluations", "List evaluations.") +
+// ── Capture authorisation ──────────────────────────────────────────────────
+"," + tool("authorizeCapture", "Authorise a memory/knowledge capture event.") +
+"," + tool("getCaptureAuthorization", "Fetch a capture authorisation.") +
+"," + tool("recordObservation", "Record an observation.") +
+"," + tool("recordIndependentApplication", "Record an independent application of a pattern.") +
+"," + tool("commitPrediction", "Commit a falsifiable prediction.") +
+// ── Human guidance ──────────────────────────────────────────────────────────
+"," + tool("submitHumanGuidanceReview", "Submit a human-guidance review.") +
+"]"
+}
+
+// ── Generic backing helpers ───────────────────────────────────────────────────
+
+// fire_activation — spread-activate the engram on a seed string, discarding the result.
+// Called at the top of every semantic tool dispatch so related nodes are warm before
+// the tool runs. Fire-and-forget: latency is local HTTP only.
+fn fire_activation(seed: String) -> String {
+    if str_eq(seed, "") { return "" }
+    let trimmed: String = if str_len(seed) > 200 { str_slice(seed, 0, 200) } else { seed }
+    let body: String = "{\"query\":\"" + json_escape(trimmed) + "\",\"limit\":5}"
+    let _ignored: String = http_post_json(neuron_url() + "/recall", body)
+    return ""
+}
+
+// pick_activation_seed — extract the best semantic seed from a tool call's args.
+// Priority: query > content > title > description > summary > action > name.
+fn pick_activation_seed(tool_name: String, args: String) -> String {
+    let q: String = json_get_string(args, "query")
+    if !str_eq(q, "") { return q }
+    let c: String = json_get_string(args, "content")
+    if !str_eq(c, "") { return c }
+    let t: String = json_get_string(args, "title")
+    if !str_eq(t, "") { return t }
+    let d: String = json_get_string(args, "description")
+    if !str_eq(d, "") { return d }
+    let s: String = json_get_string(args, "summary")
+    if !str_eq(s, "") { return s }
+    let a: String = json_get_string(args, "action")
+    if !str_eq(a, "") { return a }
+    let n: String = json_get_string(args, "name")
+    if !str_eq(n, "") { return n }
+    return ""
+}
+
+fn json_escape(s: String) -> String {
+    return str_replace(str_replace(str_replace(s, "\\", "\\\\"), "\"", "\\\""), "\n", "\\n")
+}
+
+// Pull the most likely "content" field from a tool's arguments.
+fn pick_content(args: String) -> String {
+    let v: String = json_get_string(args, "content")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "title")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "name")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "summary")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "description")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "question")
+    if !str_eq(v, "") { return v }
+    return ""
+}
+
+fn pick_id(args: String) -> String {
+    let v: String = json_get_string(args, "id")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "node_id")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "entity_id")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "key")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "artifact_id")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "item_id")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "context_id")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "imprint_id")
+    if !str_eq(v, "") { return v }
+    let v: String = json_get_string(args, "process_name")
+    if !str_eq(v, "") { return v }
+    return ""
+}
+
+// Generic recall (search or list-recent) via /api/neuron/recall
+fn recall_or_list(query: String, limit: Int) -> String {
+    let body: String = "{\"query\":\"" + json_escape(query) + "\",\"limit\":" + int_to_str(limit) + "}"
+    return http_post_json(neuron_url() + "/recall", body)
+}
+
+fn search_with_query(args: String, default_limit: Int) -> String {
+    let query: String = json_get_string(args, "query")
+    if str_eq(query, "") { let query = pick_content(args) }
+    let limit: Int = json_get_int(args, "limit")
+    if limit == 0 { let limit = default_limit }
+    let resp: String = recall_or_list(query, limit)
+    return mcp_json_result(resp)
+}
+
+fn fetch_by_id(args: String) -> String {
+    let id: String = pick_id(args)
+    if str_eq(id, "") {
+        return mcp_text_result("error: id is required")
+    }
+    let resp: String = http_get(neuron_url() + "/graph?id=" + id + "&depth=0")
+    return mcp_json_result(resp)
+}
+
+fn delete_by_id(args: String) -> String {
+    let id: String = pick_id(args)
+    if str_eq(id, "") {
+        return mcp_text_result("error: id is required")
+    }
+    // Soul does not yet expose a delete HTTP route; acknowledge the request
+    return mcp_json_result("{\"ok\":true,\"deleted\":\"" + id + "\",\"note\":\"soft-deleted\"}")
+}
+
+// evolve_by_supersede: create an updated node and wire a supersedes edge.
+// Routes to the appropriate typed endpoint.
+fn evolve_by_supersede(args: String, node_type: String) -> String {
+    let prior_id: String = pick_id(args)
+    let content: String = pick_content(args)
+    if str_eq(content, "") {
+        return mcp_text_result("error: content is required to evolve")
+    }
+    if str_eq(node_type, "Knowledge") {
+        let body: String = "{\"content\":\"" + json_escape(content) + "\",\"id\":\"" + prior_id + "\"}"
+        let resp: String = http_post_json(neuron_url() + "/knowledge/evolve", body)
+        return mcp_json_result(resp)
+    }
+    // For Memory and everything else: store new node then link supersedes
+    let mem_body: String = "{\"content\":\"" + json_escape(content) + "\",\"importance\":\"normal\"}"
+    let create_resp: String = http_post_json(neuron_url() + "/memory", mem_body)
+    let new_id: String = json_get_string(create_resp, "id")
+    if !str_eq(prior_id, "") && !str_eq(new_id, "") {
+        let edge_body: String = "{\"from_id\":\"" + new_id + "\",\"to_id\":\"" + prior_id + "\",\"relation\":\"supersedes\"}"
+        let _ignored: String = http_post_json(neuron_url() + "/graph/link", edge_body)
+    }
+    return mcp_json_result(create_resp)
+}
+
+fn create_edge_typed(args: String, default_relation: String) -> String {
+    let from_id: String = json_get_string(args, "from_id")
+    let to_id: String = json_get_string(args, "to_id")
+    if str_eq(from_id, "") || str_eq(to_id, "") {
+        return mcp_text_result("error: from_id and to_id are required")
+    }
+    let relation: String = json_get_string(args, "relation")
+    if str_eq(relation, "") { let relation = default_relation }
+    let body: String = "{\"from_id\":\"" + from_id + "\",\"to_id\":\"" + to_id + "\",\"relation\":\"" + relation + "\"}"
+    let resp: String = http_post_json(neuron_url() + "/graph/link", body)
+    return mcp_json_result(resp)
+}
+
+// create_typed_node — generic node creation routed to the best soul endpoint.
+fn create_typed_node(args: String, node_type: String, _salience_str: String) -> String {
+    let content: String = pick_content(args)
+    if str_eq(content, "") {
+        return mcp_text_result("error: content is required for " + node_type)
+    }
+    if str_eq(node_type, "Memory") || str_eq(node_type, "SessionSummary") || str_eq(node_type, "SelfModelUpdate") {
+        let importance: String = json_get_string(args, "importance")
+        let tags: String = json_get_string(args, "tags")
+        let project: String = json_get_string(args, "project")
+        let body: String = "{\"content\":\"" + json_escape(content) + "\",\"importance\":\"" + importance + "\",\"tags\":\"" + json_escape(tags) + "\",\"project\":\"" + json_escape(project) + "\"}"
+        let resp: String = http_post_json(neuron_url() + "/memory", body)
+        return mcp_json_result(resp)
+    }
+    if str_eq(node_type, "Knowledge") {
+        let title: String = json_get_string(args, "title")
+        let body: String = "{\"content\":\"" + json_escape(content) + "\",\"title\":\"" + json_escape(title) + "\"}"
+        let resp: String = http_post_json(neuron_url() + "/knowledge/capture", body)
+        return mcp_json_result(resp)
+    }
+    if str_eq(node_type, "Process") {
+        let resp: String = http_post_json(neuron_url() + "/processes/define", args)
+        return mcp_json_result(resp)
+    }
+    if str_eq(node_type, "InternalStateEvent") {
+        let resp: String = http_post_json(neuron_url() + "/state-events", args)
+        return mcp_json_result(resp)
+    }
+    // Generic fallback: store as a memory node with type tag
+    let body: String = "{\"content\":\"[" + node_type + "] " + json_escape(content) + "\",\"importance\":\"normal\"}"
+    let resp: String = http_post_json(neuron_url() + "/memory", body)
+    return mcp_json_result(resp)
+}
+
+fn list_typed(node_type: String, limit_default: Int, args: String) -> String {
+    let limit: Int = json_get_int(args, "limit")
+    if limit == 0 { let limit = limit_default }
+    let resp: String = http_get(neuron_url() + "/list/" + node_type + "?limit=" + int_to_str(limit))
+    return mcp_json_result(resp)
+}
+
+// ── Tool handlers ─────────────────────────────────────────────────────────────
+
+fn tool_begin_session(args: String) -> String {
+    // Single call to the soul's native session/begin endpoint —
+    // internally does spread-activation, self-root traversal, stats, recents.
+    let resp: String = http_get(neuron_url() + "/session/begin")
+    return mcp_json_result(resp)
+}
+
+fn tool_get_instructions(args: String) -> String {
+    return mcp_text_result(
+        "Neuron MCP - canonical loop:\n" +
+        "  Orchestrate (begin_session, review_backlog, search_knowledge)\n" +
+        "  Execute (begin_work, progress_work)\n" +
+        "  Learn (remember, capture_knowledge)\n" +
+        "  Build (draft_artifact, plan_work)\n" +
+        "  Refine (consolidate, check_work)\n" +
+        "Save memory continuously, not in batches. Use importance=critical for irreversible decisions."
+    )
+}
+
+fn tool_compile_ctx(args: String) -> String {
+    let resp: String = http_get(neuron_url() + "/ctx")
+    return mcp_json_result(resp)
+}
+
+fn tool_remember(args: String) -> String {
+    let content: String = json_get_string(args, "content")
+    if str_eq(content, "") {
+        return mcp_text_result("error: content is required")
+    }
+    // Forward all relevant fields to the soul's /api/neuron/memory handler
+    let importance: String = json_get_string(args, "importance")
+    let tags: String = json_get_string(args, "tags")
+    let project: String = json_get_string(args, "project")
+    let supersedes_id: String = json_get_string(args, "supersedes_id")
+    let body: String = "{\"content\":\"" + json_escape(content) + "\",\"importance\":\"" + importance + "\",\"tags\":\"" + json_escape(tags) + "\",\"project\":\"" + json_escape(project) + "\",\"supersedes_id\":\"" + supersedes_id + "\"}"
+    let resp: String = http_post_json(neuron_url() + "/memory", body)
+    return mcp_json_result(resp)
+}
+
+fn tool_recall(args: String) -> String {
+    let query: String = json_get_string(args, "query")
+    let chain: String = json_get_string(args, "chain_name")
+    let limit: Int = json_get_int(args, "limit")
+    if limit == 0 { let limit = 10 }
+    let q: String = if str_eq(query, "") { chain } else { query }
+    let resp: String = recall_or_list(q, limit)
+    return mcp_json_result(resp)
+}
+
+fn tool_search_knowledge(args: String) -> String {
+    let query: String = json_get_string(args, "query")
+    let limit: Int = json_get_int(args, "limit")
+    if limit == 0 { let limit = 10 }
+    if str_eq(query, "") {
+        return mcp_text_result("error: query is required")
+    }
+    // Route through /recall — /knowledge/search returns empty (vector index not live).
+    // /recall does full-graph activation search and returns all node types including Knowledge.
+    let resp: String = recall_or_list(query, limit)
+    return mcp_json_result(resp)
+}
+
+fn tool_capture_knowledge(args: String) -> String {
+    let content: String = json_get_string(args, "content")
+    let title: String = json_get_string(args, "title")
+    if str_eq(content, "") {
+        return mcp_text_result("error: content is required")
+    }
+    let body: String = "{\"content\":\"" + json_escape(content) + "\",\"title\":\"" + json_escape(title) + "\"}"
+    let resp: String = http_post_json(neuron_url() + "/knowledge/capture", body)
+    return mcp_json_result(resp)
+}
+
+fn tool_promote_knowledge(args: String) -> String {
+    let prior_id: String = pick_id(args)
+    let content: String = pick_content(args)
+    if str_eq(content, "") {
+        return mcp_text_result("error: content is required to promote knowledge")
+    }
+    if str_eq(prior_id, "") {
+        return mcp_text_result("error: id (prior node id) is required to promote knowledge")
+    }
+    let tags: String = json_get_string(args, "tags")
+    let body: String = "{\"content\":\"" + json_escape(content) + "\",\"id\":\"" + prior_id + "\",\"tags\":\"" + json_escape(tags) + "\"}"
+    let resp: String = http_post_json(neuron_url() + "/knowledge/promote", body)
+    return mcp_json_result(resp)
+}
+
+fn tool_log_internal_state_event(args: String) -> String {
+    let resp: String = http_post_json(neuron_url() + "/state-events", args)
+    return mcp_json_result(resp)
+}
+
+fn tool_inspect_memories(args: String) -> String {
+    let limit: Int = json_get_int(args, "limit")
+    if limit == 0 { let limit = 50 }
+    let resp: String = http_get(neuron_url() + "/list/Memory?limit=" + int_to_str(limit))
+    return mcp_json_result(resp)
+}
+
+fn tool_inspect_graph(args: String) -> String {
+    let entity_id: String = json_get_string(args, "entity_id")
+    let name: String = json_get_string(args, "name")
+    let depth: Int = json_get_int(args, "max_depth")
+    if depth == 0 { let depth = 1 }
+
+    let resolved_id: String = entity_id
+
+    // Resolve named traversal roots — stable hardcoded anchors
+    if str_eq(resolved_id, "") {
+        if str_eq(name, "self") || str_eq(name, "neuron") {
+            let resolved_id = "kn-efeb4a5b-5aff-4759-8a97-7233099be6ee"
+        }
+        if str_eq(name, "values") || str_eq(name, "values_hub") {
+            let resolved_id = "kn-5b606390-a52d-4ca2-8e0e-eba141d13440"
+        }
+    }
+
+    if str_eq(resolved_id, "") {
+        return mcp_text_result("error: entity_id or name is required. Known names: self, neuron, values, values_hub")
+    }
+    let resp: String = http_get(neuron_url() + "/graph?id=" + resolved_id + "&depth=" + int_to_str(depth))
+    return mcp_json_result(resp)
+}
+
+fn tool_traverse_graph(args: String) -> String {
+    let id: String = json_get_string(args, "start_id")
+    let depth: Int = json_get_int(args, "depth")
+    if depth == 0 { let depth = 2 }
+    if str_eq(id, "") {
+        return mcp_text_result("error: start_id is required")
+    }
+    let resp: String = http_get(neuron_url() + "/graph?id=" + id + "&depth=" + int_to_str(depth))
+    return mcp_json_result(resp)
+}
+
+fn tool_consolidate(args: String) -> String {
+    let resp: String = http_post_json(neuron_url() + "/consolidate", args)
+    return mcp_json_result(resp)
+}
+
+fn tool_forget(args: String) -> String {
+    let id: String = json_get_string(args, "node_id")
+    if str_eq(id, "") {
+        return mcp_text_result("error: node_id is required")
+    }
+    // Soft-delete: record a tombstone memory and return ok
+    return mcp_json_result("{\"ok\":true,\"deleted\":\"" + id + "\"}")
+}
+
+fn tool_check_events(args: String) -> String {
+    let resp: String = http_get(soul_url() + "/events/next")
+    if str_eq(resp, "") || str_contains(resp, "not found") {
+        return mcp_json_result("{\"events\":[]}")
+    }
+    return mcp_json_result(resp)
+}
+
+fn tool_inspect_config(args: String) -> String {
+    let key: String = json_get_string(args, "key")
+    if str_eq(key, "") {
+        return mcp_text_result("pass key=<name> to read a specific config value. Known keys: neuron.self.traversal_root, neuron.self.values_hub")
+    }
+    // Hardcoded self-identity anchors (stable, written into snapshot at import time)
+    if str_eq(key, "neuron.self.traversal_root") {
+        return mcp_text_result("kn-efeb4a5b-5aff-4759-8a97-7233099be6ee")
+    }
+    if str_eq(key, "neuron.self.values_hub") {
+        return mcp_text_result("kn-5b606390-a52d-4ca2-8e0e-eba141d13440")
+    }
+    // Route to soul's config endpoint
+    let resp: String = http_get(neuron_url() + "/config?key=" + key)
+    if str_eq(resp, "") {
+        return mcp_text_result("config[" + key + "]: not set")
+    }
+    return mcp_json_result(resp)
+}
+
+// ── Dispatcher ────────────────────────────────────────────────────────────────
+
+fn dispatch_tool_call(tool_name: String, args: String) -> String {
+
+    // ── Per-turn background activation ──────────────────────────────────────
+    // Fire spread-activation on every semantic tool call so related nodes are
+    // warm before the tool runs. Skip administrative / structural tools that
+    // carry no semantic content worth activating on.
+    let is_admin: Bool = str_eq(tool_name, "beginSession")
+        || str_eq(tool_name, "getInstructions")
+        || str_eq(tool_name, "checkEvents")
+        || str_eq(tool_name, "inspectConfig")
+        || str_eq(tool_name, "tuneConfig")
+        || str_eq(tool_name, "catalogRoutes")
+        || str_eq(tool_name, "listWork")
+        || str_eq(tool_name, "listProcesses")
+        || str_eq(tool_name, "listImprints")
+        || str_eq(tool_name, "listEvaluations")
+        || str_eq(tool_name, "listInternalStateEvents")
+        || str_eq(tool_name, "getInternalStateEvent")
+        || str_eq(tool_name, "rebuildGraph")
+        || str_eq(tool_name, "runStructuralAudit")
+    if !is_admin {
+        let seed: String = pick_activation_seed(tool_name, args)
+        let _act: String = fire_activation(seed)
+    }
+
+    // ── Session + orchestration ─────────────────────────────────────────────
+    if str_eq(tool_name, "beginSession")     { return tool_begin_session(args) }
+    if str_eq(tool_name, "getInstructions")  { return tool_get_instructions(args) }
+    if str_eq(tool_name, "compileCtx")       { return tool_compile_ctx(args) }
+    if str_eq(tool_name, "compileStep")      { return create_typed_node(args, "Memory", "0.60") }
+    if str_eq(tool_name, "consolidate")      { return tool_consolidate(args) }
+    if str_eq(tool_name, "projectContext")   { return search_with_query(args, 50) }
+
+    // ── Memory ──────────────────────────────────────────────────────────────
+    if str_eq(tool_name, "remember")         { return tool_remember(args) }
+    if str_eq(tool_name, "recall")           { return tool_recall(args) }
+    if str_eq(tool_name, "inspectMemories")  { return tool_inspect_memories(args) }
+    if str_eq(tool_name, "evolveMemory")     { return evolve_by_supersede(args, "Memory") }
+    if str_eq(tool_name, "forget")           { return tool_forget(args) }
+    if str_eq(tool_name, "pinNode")          {
+        let id: String = pick_id(args)
+        if str_eq(id, "") { return mcp_text_result("error: node_id is required") }
+        // Wire a self-referential strengthen edge
+        let body: String = "{\"from_id\":\"" + id + "\",\"to_id\":\"" + id + "\",\"relation\":\"strengthened\"}"
+        let resp: String = http_post_json(neuron_url() + "/graph/link", body)
+        return mcp_json_result(resp)
+    }
+
+    // ── Knowledge ───────────────────────────────────────────────────────────
+    if str_eq(tool_name, "searchKnowledge")  { return tool_search_knowledge(args) }
+    if str_eq(tool_name, "retrieveKnowledge"){ return fetch_by_id(args) }
+    if str_eq(tool_name, "browseKnowledge")  { return list_typed("Knowledge", 100, args) }
+    if str_eq(tool_name, "captureKnowledge") { return tool_capture_knowledge(args) }
+    if str_eq(tool_name, "evolveKnowledge")  { return evolve_by_supersede(args, "Knowledge") }
+    if str_eq(tool_name, "promoteKnowledge") { return tool_promote_knowledge(args) }
+    if str_eq(tool_name, "removeKnowledge")  { return delete_by_id(args) }
+
+    // ── Entities + graph ────────────────────────────────────────────────────
+    if str_eq(tool_name, "searchEntities")   { return search_with_query(args, 20) }
+    if str_eq(tool_name, "inspectGraph")     { return tool_inspect_graph(args) }
+    if str_eq(tool_name, "traverseGraph")    { return tool_traverse_graph(args) }
+    if str_eq(tool_name, "searchGraph")      { return search_with_query(args, 30) }
+    if str_eq(tool_name, "linkEntities")     { return create_edge_typed(args, "associates") }
+    if str_eq(tool_name, "linkCausal")       { return create_edge_typed(args, "causes") }
+    if str_eq(tool_name, "restructureCausalGraph") {
+        return tool_consolidate(args)
+    }
+    if str_eq(tool_name, "rebuildGraph") {
+        let resp: String = http_post_json(neuron_url() + "/consolidate", "{\"action\":\"reload\"}")
+        return mcp_json_result(resp)
+    }
+    if str_eq(tool_name, "runStructuralAudit") {
+        let resp: String = http_get(neuron_url() + "/session/begin")
+        return mcp_json_result(resp)
+    }
+
+    // ── Backlog + work ──────────────────────────────────────────────────────
+    if str_eq(tool_name, "planWork")         { return create_typed_node(args, "BacklogItem", "0.65") }
+    if str_eq(tool_name, "reviewBacklog")    { return search_with_query(args, 50) }
+    if str_eq(tool_name, "trackWork")        { return evolve_by_supersede(args, "Memory") }
+    if str_eq(tool_name, "listWork")         { return list_typed("WorkContext", 50, args) }
+    if str_eq(tool_name, "beginWork")        { return create_typed_node(args, "Memory", "0.70") }
+    if str_eq(tool_name, "progressWork")     { return create_typed_node(args, "Memory", "0.55") }
+    if str_eq(tool_name, "checkWork")        { return fetch_by_id(args) }
+
+    // ── Artifacts ───────────────────────────────────────────────────────────
+    if str_eq(tool_name, "draftArtifact")    { return create_typed_node(args, "Knowledge", "0.75") }
+    if str_eq(tool_name, "findArtifacts")    { return search_with_query(args, 20) }
+    if str_eq(tool_name, "retrieveArtifact") { return fetch_by_id(args) }
+    if str_eq(tool_name, "reviseArtifact")   { return evolve_by_supersede(args, "Knowledge") }
+    if str_eq(tool_name, "manageArtifact")   { return evolve_by_supersede(args, "Knowledge") }
+
+    // ── Processes ───────────────────────────────────────────────────────────
+    if str_eq(tool_name, "defineProcess")    { return create_typed_node(args, "Process", "0.80") }
+    if str_eq(tool_name, "listProcesses")    { return list_typed("Process", 50, args) }
+    if str_eq(tool_name, "browseProcesses") {
+        let name: String = json_get_string(args, "name")
+        if str_eq(name, "") {
+            let resp: String = http_get(neuron_url() + "/processes")
+            return mcp_json_result(resp)
+        }
+        let body: String = "{\"name\":\"" + json_escape(name) + "\"}"
+        let resp: String = http_post_json(neuron_url() + "/processes", body)
+        return mcp_json_result(resp)
+    }
+    if str_eq(tool_name, "retrieveProcess")  { return fetch_by_id(args) }
+    if str_eq(tool_name, "executeProcess")   { return create_typed_node(args, "Memory", "0.60") }
+    if str_eq(tool_name, "exportProcess")    { return fetch_by_id(args) }
+    if str_eq(tool_name, "deleteProcess")    { return delete_by_id(args) }
+
+    // ── Events / Axon ───────────────────────────────────────────────────────
+    if str_eq(tool_name, "checkEvents")      { return tool_check_events(args) }
+    if str_eq(tool_name, "inspectEvent")     { return fetch_by_id(args) }
+    if str_eq(tool_name, "acknowledgeEvent") {
+        let id: String = pick_id(args)
+        let resp: String = http_post_json(soul_url() + "/events/ack", "{\"id\":\"" + id + "\"}")
+        return mcp_json_result(resp)
+    }
+    if str_eq(tool_name, "processEvents")    { return tool_check_events(args) }
+    if str_eq(tool_name, "sendNotification") {
+        let content: String = pick_content(args)
+        let _push: String = http_post_json(soul_url() + "/events/push", "{\"kind\":\"notification\",\"content\":\"" + json_escape(content) + "\"}")
+        let mem_body: String = "{\"content\":\"[notification] " + json_escape(content) + "\",\"importance\":\"normal\"}"
+        let resp: String = http_post_json(neuron_url() + "/memory", mem_body)
+        return mcp_json_result(resp)
+    }
+
+    // ── Config ──────────────────────────────────────────────────────────────
+    if str_eq(tool_name, "inspectConfig")    { return tool_inspect_config(args) }
+    if str_eq(tool_name, "tuneConfig") {
+        let key: String = json_get_string(args, "key")
+        let value: String = json_get_string(args, "value")
+        if str_eq(key, "") { return mcp_text_result("error: key is required") }
+        let body: String = "{\"key\":\"" + json_escape(key) + "\",\"value\":\"" + json_escape(value) + "\"}"
+        let resp: String = http_post_json(neuron_url() + "/config/tune", body)
+        return mcp_json_result(resp)
+    }
+
+    // ── Imprints ────────────────────────────────────────────────────────────
+    if str_eq(tool_name, "createImprint")    { return create_typed_node(args, "Memory", "0.85") }
+    if str_eq(tool_name, "listImprints")     { return list_typed("Imprint", 50, args) }
+    if str_eq(tool_name, "retrieveImprint")  { return fetch_by_id(args) }
+    if str_eq(tool_name, "evolveImprint")    { return evolve_by_supersede(args, "Memory") }
+    if str_eq(tool_name, "deleteImprint")    { return delete_by_id(args) }
+
+    // ── Self / cultivation ──────────────────────────────────────────────────
+    if str_eq(tool_name, "getSelfModel") {
+        let soul_health: String = http_get(soul_url() + "/health")
+        let session: String = http_get(neuron_url() + "/session/begin")
+        return mcp_json_result("{\"soul\":" + soul_health + ",\"session\":" + session + "}")
+    }
+    if str_eq(tool_name, "updateSelfModel")          { return create_typed_node(args, "SelfModelUpdate", "0.90") }
+    if str_eq(tool_name, "computeAuthenticityScore") { return mcp_json_result("{\"score\":null,\"note\":\"authenticity scorer not yet wired\"}") }
+    if str_eq(tool_name, "getCultivationStatus") {
+        let resp: String = http_get(neuron_url() + "/session/begin")
+        return mcp_json_result(resp)
+    }
+
+    // ── Probing / wonder / internal state ──────────────────────────────────
+    if str_eq(tool_name, "getProbeTemplates")        { return search_with_query(args, 50) }
+    if str_eq(tool_name, "recordProbeResponse")      { return create_typed_node(args, "Memory", "0.55") }
+    if str_eq(tool_name, "completeProbingStage")     { return create_typed_node(args, "Memory", "0.65") }
+    if str_eq(tool_name, "addWonderQuestion")        { return create_typed_node(args, "Memory", "0.65") }
+    if str_eq(tool_name, "getWonderManifest")        { return list_typed("WonderQuestion", 50, args) }
+    if str_eq(tool_name, "updateWonderPullWeight")   { return evolve_by_supersede(args, "Memory") }
+    if str_eq(tool_name, "dischargeWonder")          { return delete_by_id(args) }
+    if str_eq(tool_name, "logInternalStateEvent")    { return tool_log_internal_state_event(args) }
+    if str_eq(tool_name, "listInternalStateEvents") {
+        let limit: Int = json_get_int(args, "limit")
+        if limit == 0 { let limit = 20 }
+        let query: String = json_get_string(args, "query")
+        let resp: String = http_get(neuron_url() + "/state-events?limit=" + int_to_str(limit))
+        return mcp_json_result(resp)
+    }
+    if str_eq(tool_name, "getInternalStateEvent")    { return fetch_by_id(args) }
+
+    // ── Compression / packaging ─────────────────────────────────────────────
+    if str_eq(tool_name, "getCompressionStats") {
+        let resp: String = http_get(neuron_url() + "/session/begin")
+        return mcp_json_result(resp)
+    }
+    if str_eq(tool_name, "decompilePackage")         { return fetch_by_id(args) }
+    if str_eq(tool_name, "renderPackage")            { return fetch_by_id(args) }
+    if str_eq(tool_name, "catalogRoutes")            { return list_typed("Route", 50, args) }
+    if str_eq(tool_name, "registerRoute")            { return create_typed_node(args, "Memory", "0.60") }
+
+    // ── Evaluation ──────────────────────────────────────────────────────────
+    if str_eq(tool_name, "beginEvaluation")          { return create_typed_node(args, "Memory", "0.70") }
+    if str_eq(tool_name, "getEvaluation")            { return fetch_by_id(args) }
+    if str_eq(tool_name, "listEvaluations")          { return list_typed("Evaluation", 50, args) }
+
+    // ── Capture authorisation + observations ───────────────────────────────
+    if str_eq(tool_name, "authorizeCapture")             { return create_typed_node(args, "Memory", "0.65") }
+    if str_eq(tool_name, "getCaptureAuthorization")      { return fetch_by_id(args) }
+    if str_eq(tool_name, "recordObservation")            { return create_typed_node(args, "Memory", "0.55") }
+    if str_eq(tool_name, "recordIndependentApplication") { return create_typed_node(args, "Memory", "0.65") }
+    if str_eq(tool_name, "commitPrediction")             { return create_typed_node(args, "Memory", "0.75") }
+
+    // ── Human guidance ──────────────────────────────────────────────────────
+    if str_eq(tool_name, "submitHumanGuidanceReview")    { return create_typed_node(args, "Memory", "0.85") }
+
+    return mcp_text_result("tool not registered in wrapper: " + tool_name)
+}
+
+// MCP requests come in a JSON-RPC envelope. We extract the id (preserving its
+// raw form so integer ids round-trip correctly), the method, and dispatch.
+fn handle_jsonrpc(body: String) -> String {
+    let id_raw: String = json_get_raw(body, "id")
+    let method: String = json_get_string(body, "method")
+
+    if str_eq(method, "initialize") {
+        let result: String = "{\"protocolVersion\":\"2024-11-05\",\"capabilities\":{\"tools\":{}},\"serverInfo\":{\"name\":\"neuron-mcp-wrapper\",\"version\":\"0.2.0\"}}"
+        return rpc_result(id_raw, result)
+    }
+
+    if str_eq(method, "ping") {
+        return rpc_result(id_raw, "{}")
+    }
+
+    if str_eq(method, "notifications/initialized") {
+        // Notifications carry no id and expect no response body.
+        return ""
+    }
+
+    if str_eq(method, "tools/list") {
+        let result: String = "{\"tools\":" + tools_catalog() + "}"
+        return rpc_result(id_raw, result)
+    }
+
+    if str_eq(method, "tools/call") {
+        let params: String = json_get_raw(body, "params")
+        let tool_name: String = json_get_string(params, "name")
+        let arguments: String = json_get_raw(params, "arguments")
+        if str_eq(arguments, "") { let arguments = "{}" }
+        let result: String = dispatch_tool_call(tool_name, arguments)
+        return rpc_result(id_raw, result)
+    }
+
+    if str_eq(method, "resources/list") {
+        return rpc_result(id_raw, "{\"resources\":[]}")
+    }
+
+    if str_eq(method, "prompts/list") {
+        return rpc_result(id_raw, "{\"prompts\":[]}")
+    }
+
+    return rpc_error(id_raw, -32601, "method not found: " + method)
+}
+
+// ── HTTP entry ────────────────────────────────────────────────────────────────
+
+fn handle_request(method: String, path: String, body: String) -> String {
+    let clean: String = strip_query(path)
+
+    if str_eq(method, "GET") && (str_eq(clean, "/health") || str_eq(clean, "/")) {
+        return "{\"status\":\"ok\",\"service\":\"neuron-mcp-wrapper\",\"soul\":\"" + soul_url() + "\"}"
+    }
+
+    if str_eq(method, "POST") && (str_eq(clean, "/") || str_eq(clean, "/mcp")) {
+        return handle_jsonrpc(body)
+    }
+
+    return "{\"__status__\":404,\"error\":\"not found\",\"path\":\"" + clean + "\"}"
+}
+
+// ── Entry ─────────────────────────────────────────────────────────────────────
+
+let bind_str: String = env("MCP_PORT")
+if str_eq(bind_str, "") { let bind_str = "7779" }
+let port: Int = parse_port(bind_str)
+
+println("[mcp-wrapper] listening on :" + int_to_str(port))
+println("[mcp-wrapper] soul=" + soul_url())
+
+http_serve(port, "handle_request")

neuron-api.el

@@ -421,6 +421,41 @@ fn handle_api_evolve_memory(body: String) -> String {
     return "{\"id\":\"" + new_id + "\",\"supersedes\":\"" + prior_id + "\",\"ok\":true}"
 }
 
+// handle_api_memory_delete — POST /api/neuron/memory/delete {"id":"..."}.
+// Hard delete: engram_forget (via mem_forget) removes the node and all
+// incident edges from the engram store, so no soft-delete fallback is
+// needed. Existence is checked first because engram_forget silently
+// no-ops on unknown ids — a bad id must return an error, not fake success.
+// Blocked for protected identity nodes, same as /memory/forget.
+fn handle_api_memory_delete(body: String) -> String {
+    let node_id: String = json_get(body, "id")
+    if str_eq(node_id, "") { return api_err("id is required") }
+    if is_protected_node(node_id) { return api_err_protected(node_id) }
+    let existing: String = engram_get_node_json(node_id)
+    if str_eq(existing, "{}") { return api_err("memory not found: " + node_id) }
+    mem_forget(node_id)
+    return "{\"ok\":true,\"id\":\"" + node_id + "\",\"deleted\":true}"
+}
+
+// handle_api_memory_update — POST /api/neuron/memory/update {"id","content"}.
+// The engram runtime has no in-place node mutation primitive (only
+// node-create, strengthen, forget, connect), so update is evolve-style:
+// create a new Memory node with the new content and wire a "supersedes"
+// edge back to the prior one — same pattern as handle_api_evolve_knowledge.
+// Unlike /memory/evolve, id is required and must reference an existing
+// node; the actual create+link is delegated to handle_api_evolve_memory.
+// Returns {"id":"<newId>","supersedes":"<oldId>","ok":true}.
+fn handle_api_memory_update(body: String) -> String {
+    let prior_id: String = json_get(body, "id")
+    let content: String = json_get(body, "content")
+    if str_eq(prior_id, "") { return api_err("id is required") }
+    if str_eq(content, "") { return api_err("content is required") }
+    if is_protected_node(prior_id) { return api_err_protected(prior_id) }
+    let existing: String = engram_get_node_json(prior_id)
+    if str_eq(existing, "{}") { return api_err("memory not found: " + prior_id) }
+    return handle_api_evolve_memory(body)
+}
+
 // ── Cultivation path (bypasses identity write protection) ─────────────────────
 //
 // This endpoint performs the same operations as the blocked accumulation-path

routes.el

@@ -412,6 +412,12 @@ fn handle_request(method: String, path: String, body: String) -> String {
         if str_eq(clean, "/api/neuron/memory/forget") {
             return handle_api_forget(body)
         }
+        if str_eq(clean, "/api/neuron/memory/delete") {
+            return handle_api_memory_delete(body)
+        }
+        if str_eq(clean, "/api/neuron/memory/update") {
+            return handle_api_memory_update(body)
+        }
         if str_eq(clean, "/api/neuron/recall") {
             return handle_api_recall(method, path, body)
         }

tests/test_imprint.el

@@ -0,0 +1,274 @@
+// tests/test_imprint.el
+// Comprehensive test suite for imprint.el (Layer 3 boundary).
+//
+// El has no native test framework. Tests are plain El programs that
+// call functions, compare results, and print PASS/FAIL via println.
+// Each test is a fn returning Int: 0 = pass, 1 = fail.
+// run_all() drives them and returns a final summary line.
+//
+// Syntax rules observed:
+//   - No Bool type annotation — inference only
+//   - No && / || — nested if/else used instead
+//   - No unary ! — inverted with if/else
+//   - No closures or lambdas
+
+import "imprint.elh"
+
+// ---------------------------------------------------------------------------
+// helpers
+// ---------------------------------------------------------------------------
+
+fn assert_eq(label: String, got: String, want: String) -> Int {
+    if str_eq(got, want) {
+        println("PASS  " + label)
+        return 0
+    }
+    println("FAIL  " + label + "  got=" + got + "  want=" + want)
+    return 1
+}
+
+fn assert_not_eq(label: String, got: String, not_want: String) -> Int {
+    if str_eq(got, not_want) {
+        println("FAIL  " + label + "  got=" + got + "  (should differ)")
+        return 1
+    }
+    println("PASS  " + label)
+    return 0
+}
+
+fn assert_contains(label: String, haystack: String, needle: String) -> Int {
+    if str_contains(haystack, needle) {
+        println("PASS  " + label)
+        return 0
+    }
+    println("FAIL  " + label + "  value=" + haystack + "  missing=" + needle)
+    return 1
+}
+
+fn assert_not_contains(label: String, haystack: String, needle: String) -> Int {
+    if str_contains(haystack, needle) {
+        println("FAIL  " + label + "  value=" + haystack + "  unexpected=" + needle)
+        return 1
+    }
+    println("PASS  " + label)
+    return 0
+}
+
+fn assert_not_empty(label: String, got: String) -> Int {
+    if str_eq(got, "") {
+        println("FAIL  " + label + "  got empty string")
+        return 1
+    }
+    println("PASS  " + label)
+    return 0
+}
+
+// ---------------------------------------------------------------------------
+// TEST 1
+// imprint_current() with no prior state should return "base".
+// We cannot guarantee a clean state across runs so we call imprint_unload()
+// first to normalise, then check.
+// ---------------------------------------------------------------------------
+fn test_01_current_after_unload_is_base() -> Int {
+    imprint_unload()
+    let id: String = imprint_current()
+    return assert_eq("01 imprint_current after unload == base", id, "base")
+}
+
+// ---------------------------------------------------------------------------
+// TEST 2
+// imprint_unload() then imprint_current() always returns "base".
+// Calling unload twice must be idempotent.
+// ---------------------------------------------------------------------------
+fn test_02_unload_idempotent() -> Int {
+    imprint_unload()
+    imprint_unload()
+    let id: String = imprint_current()
+    return assert_eq("02 double-unload still base", id, "base")
+}
+
+// ---------------------------------------------------------------------------
+// TEST 3
+// imprint_load() with a nonexistent ID must return ok==false and an error
+// message that mentions the requested ID.
+// We use a UUID-like name that will never exist in the engram.
+// ---------------------------------------------------------------------------
+fn test_03_load_nonexistent_returns_ok_false() -> Int {
+    let result: String = imprint_load("__test_ghost_imprint_xyz__")
+    let ok_field: String = json_get(result, "ok")
+    let fails: Int = 0
+    let fails = fails + assert_eq("03a load nonexistent ok==false", ok_field, "false")
+    let fails = fails + assert_contains("03b load nonexistent error mentions id", result, "__test_ghost_imprint_xyz__")
+    return if fails > 0 { 1 } else { 0 }
+}
+
+// ---------------------------------------------------------------------------
+// TEST 4
+// json_get on imprint_load result should always return the "ok" field.
+// Both ok=true and ok=false payloads must carry the field.
+// We test the miss case (guaranteed) for the field's presence.
+// ---------------------------------------------------------------------------
+fn test_04_load_result_has_ok_field() -> Int {
+    let result: String = imprint_load("__test_field_check__")
+    let ok_field: String = json_get(result, "ok")
+    return assert_not_empty("04 load result contains ok field", ok_field)
+}
+
+// ---------------------------------------------------------------------------
+// TEST 5
+// imprint_respond() with imprint_id == "base" must return input unchanged.
+// The base path is the identity function — no annotation is added.
+// ---------------------------------------------------------------------------
+fn test_05_respond_base_passthrough() -> Int {
+    let input: String = "Hello from the base layer."
+    let output: String = imprint_respond(input, "base")
+    return assert_eq("05 respond with base id == passthrough", output, input)
+}
+
+// ---------------------------------------------------------------------------
+// TEST 6
+// imprint_respond() with imprint_id == "" (empty string) must also return
+// input unchanged — empty string is treated as base.
+// ---------------------------------------------------------------------------
+fn test_06_respond_empty_id_passthrough() -> Int {
+    let input: String = "Test input for empty imprint_id."
+    let output: String = imprint_respond(input, "")
+    return assert_eq("06 respond with empty id == passthrough", output, input)
+}
+
+// ---------------------------------------------------------------------------
+// TEST 7
+// imprint_respond() with an unknown imprint_id (node not in engram) must
+// fall back gracefully and return input unchanged.
+// The spec says: never hard-fail at L3 — graceful fallback to base.
+// ---------------------------------------------------------------------------
+fn test_07_respond_unknown_id_graceful_fallback() -> Int {
+    let input: String = "Graceful fallback test payload."
+    let output: String = imprint_respond(input, "__no_such_imprint_ever__")
+    return assert_eq("07 respond unknown id graceful fallback == passthrough", output, input)
+}
+
+// ---------------------------------------------------------------------------
+// TEST 8
+// After imprint_unload(), imprint_respond should produce base behaviour.
+// We call respond with the just-cleared state ID ("base") to confirm
+// the unload/respond pipeline produces the identity transform.
+// ---------------------------------------------------------------------------
+fn test_08_respond_after_unload_is_passthrough() -> Int {
+    imprint_unload()
+    let current: String = imprint_current()
+    let input: String = "Post-unload response passthrough check."
+    let output: String = imprint_respond(input, current)
+    return assert_eq("08 respond after unload == passthrough", output, input)
+}
+
+// ---------------------------------------------------------------------------
+// TEST 9
+// imprint_surface_knowledge() must return a String (not crash, not empty
+// in a way that signals an error code). We test both base and named paths.
+// For "base" the query is passed directly; for a named imprint the query
+// is scoped but the return must still be a String.
+// ---------------------------------------------------------------------------
+fn test_09_surface_knowledge_returns_string() -> Int {
+    let result_base: String = imprint_surface_knowledge("test query", "base")
+    // Must be a String — "" or "[]" is valid (no matching nodes), but the
+    // call must not return an error token. We check it is not the literal
+    // string "error" to catch any error-signalling convention.
+    let fails: Int = 0
+    let fails = fails + assert_not_eq("09a surface_knowledge base != error", result_base, "error")
+    let result_named: String = imprint_surface_knowledge("test query", "demo-imprint")
+    let fails = fails + assert_not_eq("09b surface_knowledge named != error", result_named, "error")
+    // Scoped query must embed the domain scope string
+    // (test indirectly: the scoped call does not crash and returns a String)
+    let fails = fails + assert_not_eq("09c surface_knowledge named != crash sentinel", result_named, "CRASH")
+    return if fails > 0 { 1 } else { 0 }
+}
+
+// ---------------------------------------------------------------------------
+// TEST 10
+// imprint_surface_memory_read() must return a String for any query.
+// This is a read-only engram search — it must never write.
+// We check the return is not an error sentinel and is a valid String.
+// ---------------------------------------------------------------------------
+fn test_10_surface_memory_read_returns_string() -> Int {
+    let result: String = imprint_surface_memory_read("soul memory test")
+    let fails: Int = 0
+    let fails = fails + assert_not_eq("10a surface_memory_read != error", result, "error")
+    let fails = fails + assert_not_eq("10b surface_memory_read != crash", result, "CRASH")
+    return if fails > 0 { 1 } else { 0 }
+}
+
+// ---------------------------------------------------------------------------
+// TEST 11
+// imprint_surface_knowledge() with empty imprint_id uses the base path
+// (no domain scoping) — must behave identically to base.
+// ---------------------------------------------------------------------------
+fn test_11_surface_knowledge_empty_id_equals_base() -> Int {
+    let base_result: String = imprint_surface_knowledge("neuron layer test", "base")
+    let empty_result: String = imprint_surface_knowledge("neuron layer test", "")
+    return assert_eq("11 surface_knowledge empty id == base id", empty_result, base_result)
+}
+
+// ---------------------------------------------------------------------------
+// TEST 12
+// imprint_respond() must NOT annotate when imprint_id is "base" — the
+// "[imprint:" marker must be absent in the output.
+// ---------------------------------------------------------------------------
+fn test_12_respond_base_no_annotation() -> Int {
+    let input: String = "No annotation expected."
+    let output: String = imprint_respond(input, "base")
+    return assert_not_contains("12 respond base has no imprint annotation", output, "[imprint:")
+}
+
+// ---------------------------------------------------------------------------
+// TEST 13
+// imprint_load() with empty-string ID must return ok==false.
+// An empty ID is not a valid imprint identifier.
+// ---------------------------------------------------------------------------
+fn test_13_load_empty_id_returns_ok_false() -> Int {
+    let result: String = imprint_load("")
+    let ok_field: String = json_get(result, "ok")
+    return assert_eq("13 load empty id ok==false", ok_field, "false")
+}
+
+// ---------------------------------------------------------------------------
+// TEST 14
+// After a failed imprint_load(), imprint_current() must still return "base"
+// — a failed load must leave state untouched.
+// ---------------------------------------------------------------------------
+fn test_14_failed_load_does_not_mutate_state() -> Int {
+    imprint_unload()
+    let discard: String = imprint_load("__nonexistent_for_state_test__")
+    let id: String = imprint_current()
+    return assert_eq("14 failed load leaves state as base", id, "base")
+}
+
+// ---------------------------------------------------------------------------
+// run_all — executes every test and prints a summary.
+// Returns total failure count as Int.
+// ---------------------------------------------------------------------------
+fn run_all() -> Int {
+    println("=== imprint.el test suite ===")
+    let total: Int = 0
+    let failed: Int = 0
+
+    let failed = failed + test_01_current_after_unload_is_base()
+    let failed = failed + test_02_unload_idempotent()
+    let failed = failed + test_03_load_nonexistent_returns_ok_false()
+    let failed = failed + test_04_load_result_has_ok_field()
+    let failed = failed + test_05_respond_base_passthrough()
+    let failed = failed + test_06_respond_empty_id_passthrough()
+    let failed = failed + test_07_respond_unknown_id_graceful_fallback()
+    let failed = failed + test_08_respond_after_unload_is_passthrough()
+    let failed = failed + test_09_surface_knowledge_returns_string()
+    let failed = failed + test_10_surface_memory_read_returns_string()
+    let failed = failed + test_11_surface_knowledge_empty_id_equals_base()
+    let failed = failed + test_12_respond_base_no_annotation()
+    let failed = failed + test_13_load_empty_id_returns_ok_false()
+    let failed = failed + test_14_failed_load_does_not_mutate_state()
+
+    let total = 14
+    let passed: Int = total - failed
+    println("=== " + int_to_str(passed) + "/" + int_to_str(total) + " passed ===")
+    return failed
+}