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@@ -94,39 +94,18 @@ fn hist_append(hist: String, role: String, content: String) -> String {
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return "[" + inner + "," + entry + "]"
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}
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// hist_trim — drop the oldest two entries from a history JSON array.
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//
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// Issue #5 (BROKEN 20-TURN TRIM) + Issue #10 (OFF-BY-ONE): the original code uses
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// str_index_of to find '{"role":' markers by raw string scanning. If any message content
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// contains the literal string '{"role":' (e.g. the LLM quoted JSON), the marker search
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// lands inside a content value and the resulting slice is malformed. Additionally, the
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// function had no minimum-retained-count guard.
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//
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// Fix: use json_array_len / json_array_get to work at the structural level, immune to
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// content containing marker strings. Drop entries 0 and 1 (oldest user+assistant pair)
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// and rebuild from entry 2 onward. Minimum retained count: 2 entries (never over-trim).
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fn hist_trim(hist: String) -> String {
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let total: Int = json_array_len(hist)
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// Safety: never trim below 2 entries. If already at or below the minimum, return unchanged.
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if total <= 2 {
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return hist
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let inner: String = str_slice(hist, 1, str_len(hist) - 1)
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let marker: String = "{\"role\":"
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let i1: Int = str_index_of(inner, marker)
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let tail1: String = str_slice(inner, i1 + 1, str_len(inner))
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let i2: Int = str_index_of(tail1, marker)
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let tail2: String = str_slice(tail1, i2 + 1, str_len(tail1))
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let i3: Int = str_index_of(tail2, marker)
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if i3 >= 0 {
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return "[" + str_slice(tail2, i3, str_len(tail2)) + "]"
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}
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// Drop entry 0 and entry 1 (oldest user+assistant pair). Rebuild from entry 2 onward.
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let result: String = ""
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let i: Int = 2
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while i < total {
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let entry: String = json_array_get(hist, i)
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let result = if str_eq(result, "") {
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entry
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} else {
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result + "," + entry
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}
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let i = i + 1
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}
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if str_eq(result, "") {
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return hist
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}
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return "[" + result + "]"
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return hist
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}
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// clean_llm_response — strips GPT-2 BPE byte-to-unicode artifacts that vLLM
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@@ -145,72 +124,29 @@ fn clean_llm_response(s: String) -> String {
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}
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// conv_history_persist — save conversation history to engram for cross-restart continuity.
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// Stores as a Conversation node with label "conv:history".
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//
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// Issue #4 (OVERWRITE WITHOUT DELETE): engram_node_full behaviour on duplicate labels is
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// implementation-defined. If it appends rather than upserts, stale older nodes accumulate.
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// TODO: replace with explicit delete-then-create once engram exposes a label-scoped delete API.
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//
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// Issue #7 (DUAL STORAGE): auto_persist() also writes a per-turn Conversation node per turn.
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// Both run every turn for different purposes (rolling array vs. Q&A snapshot). Documented here.
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// Stores as a Conversation node. Overwrites by using consistent label "conv:history".
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fn conv_history_persist(hist: String) -> Void {
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if str_eq(hist, "") { return "" }
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if str_eq(hist, "[]") { return "" }
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// Issue #6 (PARTIAL-WRITE GUARD): refuse to persist a blob that is not a complete JSON
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// array. A truncated write starting with '[' but missing ']' passes the old
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// str_starts_with check and would overwrite a good node with a corrupt one.
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if !str_starts_with(hist, "[") { return "" }
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if !str_contains(hist, "]") { return "" }
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let ts: Int = time_now()
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let tags: String = "[\"conv-history\",\"persistent\"]"
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let node_id: String = engram_node_full(
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let discard: String = engram_node_full(
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hist, "Conversation", "conv:history",
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el_from_float(0.7), el_from_float(0.8), el_from_float(0.9),
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"Episodic", tags
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)
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// Issue #2 (SILENT FAILURE): surface write failures in logs rather than dropping silently.
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if str_eq(node_id, "") {
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println("[chat] conv_history_persist: engram_node_full returned empty — history node may be lost")
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}
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}
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// conv_history_load — restore conversation history from engram on first access.
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//
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// Issue #1 (ASYMMETRIC PERSIST/LOAD): original code loaded only via vector search, which
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// is not symmetric with the label-based write in conv_history_persist. A cold or corrupt
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// vector index returns [] even when the node exists on disk. Fixed by trying a label-based
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// fetch (engram_get_node_by_label) first, falling back to vector search only when that fails.
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//
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// Issue #2 (SILENT LOAD FAILURE): all failure paths now emit a log line so history loss
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// is visible rather than silently treated as a first-turn conversation.
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//
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// Issue #6 (PARTIAL-WRITE GUARD): content must start with '[' AND contain ']' before
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// being accepted — a truncated write that starts with '[' but has no ']' would pass the
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// old str_starts_with check and cause downstream json_array_len to malfunction.
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// Returns the most recent "conv:history" node content, or "" if none found.
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fn conv_history_load() -> String {
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// Primary: label-based fetch — symmetric with persist, immune to vector index drift.
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let label_node: String = engram_get_node_by_label("conv:history")
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let label_ok: Bool = !str_eq(label_node, "") && !str_eq(label_node, "null")
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if label_ok {
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let label_content: String = json_get(label_node, "content")
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let label_valid: Bool = str_starts_with(label_content, "[") && str_contains(label_content, "]")
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if label_valid {
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return label_content
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}
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// Label node exists but content is invalid — partial write or corruption.
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println("[chat] conv_history_load: label node found but content invalid — falling back to vector search")
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}
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// Fallback: vector search — covers nodes indexed before this fix, or on cold index.
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let results: String = engram_search_json("conv:history", 3)
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if str_eq(results, "") { return "" }
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if str_eq(results, "[]") { return "" }
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let node: String = json_array_get(results, 0)
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let content: String = json_get(node, "content")
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// Issue #6: full partial-write guard — require both '[' prefix AND ']' presence.
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if !str_starts_with(content, "[") || !str_contains(content, "]") {
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println("[chat] conv_history_load: vector search result content invalid — treating as first turn")
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return ""
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}
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// Validate it looks like a JSON array
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if !str_starts_with(content, "[") { return "" }
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return content
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}
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@@ -221,13 +157,6 @@ fn handle_chat(body: String) -> String {
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}
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// Load history BEFORE compiling context so we can anchor activation to the thread.
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// Issue #3 (NO RECOVERY PATH): when conv_history_load() returns "" (corrupted node,
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// missing embeddings, search failure), handle_chat treats it identically to a genuine
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// first-turn conversation — no retry, no ID fallback, no caller signal. The old history
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// node also sits as an orphaned entry in engram and is never cleaned up. The improvements
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// in conv_history_load() (Issues #1, #2) reduce false negatives, but a full recovery path
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// requires caller-level state changes too invasive for a targeted fix.
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// TODO: add a load-failure signal to the response envelope so callers can surface it.
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let state_hist: String = state_get("conv_history")
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let stored_hist: String = if str_eq(state_hist, "") { conv_history_load() } else { state_hist }
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let hist_len: Int = if str_eq(stored_hist, "") { 0 } else { json_array_len(stored_hist) }
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@@ -257,13 +186,6 @@ fn handle_chat(body: String) -> String {
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let req_model: String = json_get(body, "model")
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let model: String = if str_eq(req_model, "") { chat_default_model() } else { req_model }
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// Safety augmentation on the main chat path. Previously only applied on the
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// handle_chat_as_soul / handle_dharma_room_turn paths. The phrase-list bell
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// detector (safety_augment_system) was absent from handle_chat, so a user
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// expressing crisis in the primary conversational UI bypassed soft/hard
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// directive injection entirely. Applying it here before every llm_call_system.
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let full_system = safety_augment_system(full_system, message)
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let raw_response: String = llm_call_system(model, full_system, message)
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let is_error: Bool = str_starts_with(raw_response, "{\"error\"")
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@@ -278,11 +200,6 @@ fn handle_chat(body: String) -> String {
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let updated_hist: String = hist_append(stored_hist, "user", message)
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let updated_hist2: String = hist_append(updated_hist, "assistant", raw_response)
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// Issue #8 (NO MAX SIZE GUARD): the 20-turn count limit bounds entry count, but individual
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// messages can be arbitrarily large (up to max_tokens = 4096 tokens each). At 20 turns the
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// history blob can reach ~80KB before trim fires. engram_node_full has no apparent size cap.
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// A byte-length cap would require truncating or summarising entries — too invasive here.
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// TODO: add a byte-length cap (e.g. 32KB) that drops oldest entries until under limit.
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let final_hist: String = if json_array_len(updated_hist2) > 20 {
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hist_trim(updated_hist2)
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} else {
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@@ -592,17 +509,12 @@ fn dispatch_tool(tool_name: String, tool_input: String) -> String {
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let path: String = json_get(tool_input, "path")
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let old_text: String = json_get(tool_input, "old_text")
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let new_text: String = json_get(tool_input, "new_text")
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let root: String = agent_workspace_root()
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if !path_within_root(path, root) {
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return json_safe("denied: path is outside the agent workspace root")
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}
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let resolved: String = resolve_in_root(path, root)
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let content: String = fs_read(resolved)
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let content: String = fs_read(path)
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if str_eq(content, "") {
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return json_safe("{\"error\":\"file not found\"}")
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}
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let updated: String = str_replace(content, old_text, new_text)
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fs_write(resolved, updated)
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fs_write(path, updated)
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return json_safe("{\"ok\":true}")
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}
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if str_eq(tool_name, "remember") {
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@@ -763,23 +675,12 @@ fn handle_chat_agentic(body: String) -> String {
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// Persist the exchange to session/global history for thread continuity on next turn.
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// Only save when the loop completed (reply present), not when tool_pending.
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//
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// Issue #9 (AGENTIC HISTORY NOT PERSISTED): the agentic path previously only saved
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// history to in-process state (state_set), which is lost on restart. We now also call
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// conv_history_persist() for the default session (hist_key == "conv_history") so agentic
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// history survives restarts the same way non-agentic history does. Per-session histories
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// (session_hist_<id>) are still in-process only — persisting all named sessions would
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// require per-session engram labels, a larger change tracked separately.
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let reply_text: String = json_get(result, "reply")
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let discard_hist: Bool = if !str_eq(reply_text, "") {
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let updated: String = hist_append(agentic_hist, "user", message)
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let updated2: String = hist_append(updated, "assistant", reply_text)
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let trimmed: String = if json_array_len(updated2) > 20 { hist_trim(updated2) } else { updated2 }
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state_set(hist_key, trimmed)
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// Only persist the default global session to engram — named sessions are ephemeral.
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if str_eq(hist_key, "conv_history") {
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conv_history_persist(trimmed)
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}
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true
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} else { false }
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@@ -1153,19 +1054,13 @@ fn handle_dharma_room_turn(body: String) -> String {
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// engram_node(content, "episodic", ...) which wrongly put a TIER into the node_type
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// slot — that's why nodes showed node_type="episodic". Use the full, correct contract.)
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let utterance_tags: String = "[\"soul-utterance\",\"episodic\"]"
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let utterance_id: String = engram_node_full(
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let discard_id: String = engram_node_full(
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clean_response, "Conversation", "soul:utterance",
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el_from_float(0.6), el_from_float(0.6), el_from_float(0.8),
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"Episodic", utterance_tags
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)
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if str_eq(utterance_id, "") {
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println("[chat] handle_dharma_room_turn: utterance engram write failed — node lost")
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}
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if !str_eq(snap_path, "") {
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let save_result: String = engram_save(snap_path)
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if str_eq(save_result, "") {
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println("[chat] handle_dharma_room_turn: engram_save failed for " + snap_path)
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}
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let discard_save: String = engram_save(snap_path)
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}
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let safe_response: String = json_safe(clean_response)
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Tim Lingo