feat(hooks): improve session-memory with LLM summarization

The session-memory hook now generates proper summaries instead of
capturing just 15 lines of raw content.

Changes:
- Read full session transcript instead of last 15 lines
- Filter out noise (heartbeats, NO_REPLY, tool blocks, system messages)
- Use LLM to generate structured summary with:
  - Topics discussed
  - Decisions made
  - Outcomes achieved
  - Open items remaining
- Fall back to raw content if LLM summarization fails
- Update HOOK.md documentation

This makes /new actually preserve useful session context for future
memory recall, rather than capturing mostly heartbeat noise.

src/hooks/bundled/session-memory/HOOK.md

@@ -22,15 +22,24 @@ Automatically saves session context to your workspace memory when you issue the
 
 When you run `/new` to start a fresh session:
 
-1. **Finds the previous session** - Uses the pre-reset session entry to locate the correct transcript
+1. **Reads the full session transcript** - Parses the JSONL session file
-2. **Extracts conversation** - Reads the last 15 lines of conversation from the session
+2. **Filters out noise** - Removes heartbeats, NO_REPLY, tool blocks, and system messages
-3. **Generates descriptive slug** - Uses LLM to create a meaningful filename slug based on conversation content
+3. **Generates descriptive slug** - Uses LLM to create a meaningful filename slug
-4. **Saves to memory** - Creates a new file at `<workspace>/memory/YYYY-MM-DD-slug.md`
+4. **Summarizes via LLM** - Creates a structured summary of the session content
-5. **Sends confirmation** - Notifies you with the file path
+5. **Saves to memory** - Creates a new file at `<workspace>/memory/YYYY-MM-DD-slug.md`
+
+## Summary Format
+
+The LLM generates a structured summary including:
+
+- **Topics**: Main subjects discussed
+- **Decisions**: Key decisions or conclusions reached
+- **Outcomes**: What was accomplished or resolved
+- **Open Items**: Unfinished tasks or questions (if any)
 
 ## Output Format
 
-Memory files are created with the following format:
+Memory files are created with the following structure:
 
 ```markdown
 # Session: 2026-01-16 14:30:00 UTC
@@ -38,6 +47,21 @@ Memory files are created with the following format:
 - **Session Key**: agent:main:main
 - **Session ID**: abc123def456
 - **Source**: telegram
+
+## Summary
+
+**Topics**: API integration, deployment pipeline
+
+**Decisions**: 
+- Use REST over GraphQL for the initial implementation
+- Deploy to staging before production
+
+**Outcomes**:
+- Created initial endpoint scaffolding
+- Configured CI/CD workflow
+
+**Open Items**:
+- Need to finalize auth strategy with the team
 ```
 
 ## Filename Examples
@@ -49,19 +73,31 @@ The LLM generates descriptive slugs based on your conversation:
 - `2026-01-16-bug-fix.md` - Debugging session
 - `2026-01-16-1430.md` - Fallback timestamp if slug generation fails
 
+## Noise Filtering
+
+The following are automatically filtered out:
+
+- Heartbeat prompts (`Read HEARTBEAT.md...`)
+- Heartbeat responses (`HEARTBEAT_OK`)
+- Silent replies (`NO_REPLY`)
+- System messages
+- Slash commands
+- Empty messages
+
 ## Requirements
 
 - **Config**: `workspace.dir` must be set (automatically configured during onboarding)
 
-The hook uses your configured LLM provider to generate slugs, so it works with any provider (Anthropic, OpenAI, etc.).
+The hook uses your configured LLM provider to generate summaries, so it works with any provider (Anthropic, OpenAI, etc.).
 
 ## Configuration
 
 No additional configuration required. The hook automatically:
 
 - Uses your workspace directory (`~/clawd` by default)
-- Uses your configured LLM for slug generation
+- Uses your configured LLM for slug and summary generation
-- Falls back to timestamp slugs if LLM is unavailable
+- Falls back to raw content if LLM summarization fails
+- Falls back to timestamp slugs if slug generation fails
 
 ## Disabling
 
@@ -84,3 +120,12 @@ Or remove it from your config:
   }
 }
 ```
+
+## Token Usage
+
+This hook makes two LLM calls when `/new` is issued:
+
+1. **Slug generation**: ~2k token context, small output
+2. **Summary generation**: Up to 50k token context, ~500 token output
+
+If you want to minimize token usage, you can disable the hook and manually run `/compact` before `/new` instead.

src/hooks/bundled/session-memory/handler.ts

@@ -2,31 +2,57 @@
  * Session memory hook handler
  *
  * Saves session context to memory when /new command is triggered
- * Creates a new dated memory file with LLM-generated slug
+ * Creates a new dated memory file with LLM-generated slug and summary
  */
 
 import fs from "node:fs/promises";
 import path from "node:path";
 import os from "node:os";
 import type { ClawdbotConfig } from "../../../config/config.js";
-import { resolveAgentWorkspaceDir } from "../../../agents/agent-scope.js";
+import { resolveAgentWorkspaceDir, resolveAgentDir } from "../../../agents/agent-scope.js";
 import { resolveAgentIdFromSessionKey } from "../../../routing/session-key.js";
 import type { HookHandler } from "../../hooks.js";
 
+/** Patterns to filter out noise from session content */
+const NOISE_PATTERNS = [
+  /^Read HEARTBEAT\.md/i,
+  /^HEARTBEAT_OK$/i,
+  /^NO_REPLY$/i,
+  /^\s*$/,
+  /^System:/,
+];
+
+/** Maximum characters to send to LLM for summarization */
+const MAX_CONTENT_CHARS = 50000;
+
+/** Maximum characters for slug generation (smaller context) */
+const MAX_SLUG_CHARS = 2000;
+
 /**
- * Read recent messages from session file for slug generation
+ * Check if a message should be filtered out as noise
  */
-async function getRecentSessionContent(sessionFilePath: string): Promise<string | null> {
+function isNoise(text: string): boolean {
+  return NOISE_PATTERNS.some((pattern) => pattern.test(text.trim()));
+}
+
+/**
+ * Extract all meaningful messages from session file
+ * Filters out heartbeats, NO_REPLY, tool blocks, and other noise
+ */
+async function getFullSessionContent(sessionFilePath: string): Promise<{
+  messages: string[];
+  userMessages: string[];
+  assistantMessages: string[];
+} | null> {
   try {
     const content = await fs.readFile(sessionFilePath, "utf-8");
     const lines = content.trim().split("\n");
 
-    // Get last 15 lines (recent conversation)
-    const recentLines = lines.slice(-15);
-
-    // Parse JSONL and extract messages
     const messages: string[] = [];
-    for (const line of recentLines) {
+    const userMessages: string[] = [];
+    const assistantMessages: string[] = [];
+
+    for (const line of lines) {
       try {
         const entry = JSON.parse(line);
         // Session files have entries with type="message" containing a nested message object
@@ -35,11 +61,32 @@ async function getRecentSessionContent(sessionFilePath: string): Promise<string
           const role = msg.role;
           if ((role === "user" || role === "assistant") && msg.content) {
             // Extract text content
-            const text = Array.isArray(msg.content)
+            let text: string | undefined;
-              ? msg.content.find((c: any) => c.type === "text")?.text
+            if (Array.isArray(msg.content)) {
-              : msg.content;
+              // Find text content blocks, skip tool_use/tool_result
-            if (text && !text.startsWith("/")) {
+              const textBlock = msg.content.find(
-              messages.push(`${role}: ${text}`);
+                (c: any) => c.type === "text" && typeof c.text === "string",
+              );
+              text = textBlock?.text;
+            } else if (typeof msg.content === "string") {
+              text = msg.content;
+            }
+
+            // Skip if no text, starts with slash command, or is noise
+            if (!text || text.startsWith("/") || isNoise(text)) {
+              continue;
+            }
+
+            // Truncate very long messages to avoid blowing up context
+            const truncated = text.length > 2000 ? text.slice(0, 2000) + "..." : text;
+
+            const formatted = `${role}: ${truncated}`;
+            messages.push(formatted);
+
+            if (role === "user") {
+              userMessages.push(truncated);
+            } else {
+              assistantMessages.push(truncated);
             }
           }
         }
@@ -48,12 +95,93 @@ async function getRecentSessionContent(sessionFilePath: string): Promise<string
       }
     }
 
-    return messages.join("\n");
+    return { messages, userMessages, assistantMessages };
   } catch {
     return null;
   }
 }
 
+/**
+ * Generate LLM summary of session content
+ */
+async function generateSummaryViaLLM(params: {
+  sessionContent: string;
+  cfg: ClawdbotConfig;
+  agentId: string;
+  workspaceDir: string;
+}): Promise<string | null> {
+  let tempSessionFile: string | null = null;
+
+  try {
+    const { runEmbeddedPiAgent } = await import("../../../agents/pi-embedded.js");
+    const agentDir = resolveAgentDir(params.cfg, params.agentId);
+
+    // Create a temporary session file for this one-off LLM call
+    const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), "clawdbot-summary-"));
+    tempSessionFile = path.join(tempDir, "session.jsonl");
+
+    const prompt = `Summarize this session for future memory recall. Be concise but complete.
+
+Include:
+- **Topics**: Main subjects discussed
+- **Decisions**: Key decisions or conclusions reached
+- **Outcomes**: What was accomplished or resolved
+- **Open Items**: Any unfinished tasks or questions (if applicable)
+
+Skip routine/administrative messages. Focus on substance.
+
+Session transcript:
+${params.sessionContent}
+
+Write the summary in Markdown format, suitable for a memory file.`;
+
+    const result = await runEmbeddedPiAgent({
+      sessionId: `summary-generator-${Date.now()}`,
+      sessionKey: "temp:summary-generator",
+      sessionFile: tempSessionFile,
+      workspaceDir: params.workspaceDir,
+      agentDir,
+      config: params.cfg,
+      prompt,
+      timeoutMs: 30_000, // 30 second timeout for summary
+      runId: `summary-gen-${Date.now()}`,
+    });
+
+    // Clean up temp files
+    try {
+      await fs.rm(path.dirname(tempSessionFile), { recursive: true, force: true });
+    } catch {
+      // Ignore cleanup errors
+    }
+
+    // Extract text from payloads
+    if (result.payloads && result.payloads.length > 0) {
+      const text = result.payloads[0]?.text;
+      if (text) {
+        return text.trim();
+      }
+    }
+
+    console.error("[session-memory] LLM summary returned no content");
+    return null;
+  } catch (err) {
+    console.error(
+      "[session-memory] Summary generation error:",
+      err instanceof Error ? err.message : String(err),
+    );
+    return null;
+  } finally {
+    // Ensure cleanup
+    if (tempSessionFile) {
+      try {
+        await fs.rm(path.dirname(tempSessionFile), { recursive: true, force: true });
+      } catch {
+        // Ignore
+      }
+    }
+  }
+}
+
 /**
  * Save session context to memory when /new command is triggered
  */
@@ -79,7 +207,7 @@ const saveSessionToMemory: HookHandler = async (event) => {
     const now = new Date(event.timestamp);
     const dateStr = now.toISOString().split("T")[0]; // YYYY-MM-DD
 
-    // Generate descriptive slug from session using LLM
+    // Get session entry info
     const sessionEntry = (context.previousSessionEntry || context.sessionEntry || {}) as Record<
       string,
       unknown
@@ -94,28 +222,47 @@ const saveSessionToMemory: HookHandler = async (event) => {
     const sessionFile = currentSessionFile || undefined;
 
     let slug: string | null = null;
-    let sessionContent: string | null = null;
+    let summary: string | null = null;
+    let rawContent: string | null = null;
 
     if (sessionFile) {
-      // Get recent conversation content
+      // Get full conversation content (filtered)
-      sessionContent = await getRecentSessionContent(sessionFile);
+      const parsed = await getFullSessionContent(sessionFile);
-      console.log("[session-memory] sessionContent length:", sessionContent?.length || 0);
+      console.log("[session-memory] Parsed messages:", parsed?.messages.length || 0);
 
-      if (sessionContent && cfg) {
+      if (parsed && parsed.messages.length > 0) {
-        console.log("[session-memory] Calling generateSlugViaLLM...");
+        // Prepare content for LLM (cap at max chars)
-        // Dynamically import the LLM slug generator (avoids module caching issues)
+        const fullContent = parsed.messages.join("\n\n");
-        // When compiled, handler is at dist/hooks/bundled/session-memory/handler.js
+        rawContent = fullContent.slice(0, MAX_CONTENT_CHARS);
-        // Going up ../.. puts us at dist/hooks/, so just add llm-slug-generator.js
-        const clawdbotRoot = path.resolve(
-          path.dirname(import.meta.url.replace("file://", "")),
-          "../..",
-        );
-        const slugGenPath = path.join(clawdbotRoot, "llm-slug-generator.js");
-        const { generateSlugViaLLM } = await import(slugGenPath);
 
-        // Use LLM to generate a descriptive slug
+        if (cfg) {
-        slug = await generateSlugViaLLM({ sessionContent, cfg });
+          // Generate slug from recent content (smaller context)
-        console.log("[session-memory] Generated slug:", slug);
+          const slugContent = parsed.messages.slice(-10).join("\n").slice(0, MAX_SLUG_CHARS);
+
+          console.log("[session-memory] Generating slug...");
+          try {
+            const clawdbotRoot = path.resolve(
+              path.dirname(import.meta.url.replace("file://", "")),
+              "../..",
+            );
+            const slugGenPath = path.join(clawdbotRoot, "llm-slug-generator.js");
+            const { generateSlugViaLLM } = await import(slugGenPath);
+            slug = await generateSlugViaLLM({ sessionContent: slugContent, cfg });
+            console.log("[session-memory] Generated slug:", slug);
+          } catch (err) {
+            console.error("[session-memory] Slug generation failed:", err);
+          }
+
+          // Generate full summary via LLM
+          console.log("[session-memory] Generating summary...");
+          summary = await generateSummaryViaLLM({
+            sessionContent: rawContent,
+            cfg,
+            agentId,
+            workspaceDir,
+          });
+          console.log("[session-memory] Summary generated:", summary ? "yes" : "no");
+        }
       }
     }
 
@@ -149,9 +296,19 @@ const saveSessionToMemory: HookHandler = async (event) => {
       "",
     ];
 
-    // Include conversation content if available
+    // Include LLM-generated summary if available
-    if (sessionContent) {
+    if (summary) {
-      entryParts.push("## Conversation Summary", "", sessionContent, "");
+      entryParts.push("## Summary", "", summary, "");
+    } else if (rawContent) {
+      // Fallback to raw content if summary generation failed
+      entryParts.push(
+        "## Conversation Excerpt",
+        "",
+        "_Note: LLM summary unavailable, showing raw content_",
+        "",
+        rawContent.slice(0, 5000),
+        "",
+      );
     }
 
     const entry = entryParts.join("\n");