Forge Skill

Typically runs automatically via SessionEnd hook.

Extract knowledge from session transcripts.

How It Works

The SessionEnd hook runs:

ao forge transcript --last-session --queue --quiet

This queues the session for knowledge extraction.

Flags

--promote

.agents/knowledge/pending/

.agents/learnings/

Promote Mode

Given

$forge --promote

Promote Step 1: Find Pending Files

ls -lt .agents/knowledge/pending/*.md 2>/dev/null
ls -lt .agents/ao/pending.jsonl 2>/dev/null

If no pending files found, report "No pending extractions" and exit.

Promote Step 2: Process Each Pending File

For each file in

.agents/knowledge/pending/

1. Read the file content
2. Validate it has required fields (

   # Learning:

   ,

   **Category**:

   ,

   **Confidence**:

   )
3. Copy to

   .agents/learnings/

   (preserving filename)
4. Remove the source file from

   .agents/knowledge/pending/

Promote Step 3: Process Pending Queue

if [ -f .agents/ao/pending.jsonl ] && [ -s .agents/ao/pending.jsonl ]; then
  # Process each queued session
  cat .agents/ao/pending.jsonl
  # After processing, clear the queue
  > .agents/ao/pending.jsonl
fi

Promote Step 4: Report

Promoted N learnings from pending → .agents/learnings/
Queue cleared.

Done. Return immediately after reporting.

Manual Execution

Given

$forge [path]

Step 1: Identify Transcript

With ao CLI:

# Mine recent sessions
ao forge transcript --last-session

# Mine specific transcript
ao forge transcript <path>

Without ao CLI: Look at recent conversation history and extract learnings manually.

Step 2: Extract Knowledge Types

Read

skills/forge/references/uncaptured-lesson-patterns.md

Look for these patterns in the transcript:

Uncaptured Lesson Matching: During transcript scanning, match events against the 26 known uncaptured lesson patterns (see

references/uncaptured-lesson-patterns.md

Step 3: Write Candidates

Write to:

.agents/forge/YYYY-MM-DD-forge.md

# Forged: YYYY-MM-DD

## Decisions
- [D1] <decision made>
  - Source: <where in conversation>
  - Confidence: <0.0-1.0>

## Learnings
- [L1] <what was learned>
  - Source: <where in conversation>
  - Confidence: <0.0-1.0>

## Failures
- [F1] <what failed and why>
  - Source: <where in conversation>
  - Confidence: <0.0-1.0>

## Patterns
- [P1] <reusable pattern>
  - Source: <where in conversation>
  - Confidence: <0.0-1.0>

Step 4: Index for Search

if command -v ao &>/dev/null; then
  ao forge markdown .agents/forge/YYYY-MM-DD-forge.md 2>/dev/null
else
  # Without ao CLI: auto-promote high-confidence candidates to learnings
  mkdir -p .agents/learnings .agents/ao
  for f in .agents/forge/YYYY-MM-DD-*.md; do
    [ -f "$f" ] || continue
    # Extract confidence (numeric or categorical)
    CONF=$(grep -i "confidence:" "$f" | head -1 | awk '{print $NF}')
    # Normalize categorical to numeric: high=0.9, medium=0.6, low=0.3
    case "$CONF" in
      high) CONF_NUM=0.9 ;; medium) CONF_NUM=0.6 ;; low) CONF_NUM=0.3 ;; *) CONF_NUM=$CONF ;;
    esac
    # Auto-promote if confidence >= 0.7, prepending required frontmatter
    if (( $(echo "$CONF_NUM >= 0.7" | bc -l) )); then
      { printf -- '---\ntype: learning\nsource: forge\ndate: %s\nmaturity: provisional\nutility: 0.5\n---\n' "$(date +%Y-%m-%d)"; cat "$f"; } > .agents/learnings/"$(basename "$f")"
      TITLE=$(head -1 "$f" | sed 's/^# //')
      echo "{\"file\": \".agents/learnings/$(basename $f)\", \"title\": \"$TITLE\", \"keywords\": [], \"timestamp\": \"$(date -Iseconds)\"}" >> .agents/ao/search-index.jsonl
      echo "Auto-promoted (confidence $CONF): $(basename $f)"
    fi
  done
  echo "Forge indexing complete (ao CLI not available — high-confidence candidates auto-promoted)"
fi

Step 5: Update Capture Tracking

After extracting learnings that match uncaptured lesson patterns (Step 2), record which patterns were captured. This state lives in

.agents/forge/capture-tracking.json

skills/

mkdir -p .agents/forge

1. Read

   .agents/forge/capture-tracking.json

   if it exists, otherwise start with

   {}

2. For each matched pattern, add or update an entry keyed by pattern number:

   {
     "3": {"captured": true, "date": "2026-03-30", "learning_path": ".agents/learnings/tooling/use-bin-cp.md"},
     "7": {"captured": true, "date": "2026-03-29", "learning_path": ".agents/learnings/operations/worktree-commit.md"}
   }
   

3. Write the updated JSON back to

   .agents/forge/capture-tracking.json

Pattern numbers correspond to the numbered headings in

references/uncaptured-lesson-patterns.md

Step 6: Report Results

Tell the user:

• Number of items extracted by type
• Location of forge output
• Candidates ready for promotion to learnings
• Capture progress: "X/26 uncaptured lesson patterns captured" (read from

  .agents/forge/capture-tracking.json

  )

The Quality Pool

Forged candidates enter at Tier 0:

Transcript → $forge → .agents/forge/ (Tier 0)
                           ↓
                   Human review or 2+ citations
                   OR auto-promote (confidence >= 0.7, ao-free fallback)
                           ↓
                   .agents/learnings/ (Tier 1)

Key Rules

• Runs automatically - usually via hook
• Extract, don't interpret - capture what was said
• Score by confidence - not all extractions are equal
• Queue for review - candidates need validation

Examples

SessionEnd Hook Invocation

Hook triggers:

session-end.sh

What happens:

1. Hook calls

   ao forge transcript --last-session --queue --quiet

2. CLI analyzes session transcript for decisions, learnings, failures, patterns
3. CLI writes session ID to

   .agents/ao/pending.jsonl

   queue
4. Next session start triggers

   $forge --promote

   to process the queue

Result: Session transcript automatically queued for knowledge extraction without user action.

Manual Transcript Mining

User says:

$forge <path>

What happens:

1. Agent identifies transcript path or uses

   ao forge transcript --last-session

2. Agent scans transcript for knowledge patterns (decisions, learnings, failures, patterns)
3. Agent scores each extraction by confidence (0.0-1.0)
4. Agent writes candidates to

   .agents/forge/YYYY-MM-DD-forge.md

5. Agent indexes forge output with

   ao forge markdown

6. Agent reports extraction counts and candidate locations

Result: Transcript mined for reusable knowledge, candidates ready for human review or 2+ citations promotion.

Troubleshooting

.agents/ao/pending.jsonl

Reference Documents

• references/uncaptured-lesson-patterns.md — signal patterns and 26 known uncaptured lesson categories for transcript mining