/friction-detector

name: friction-detector
description: 'Detect friction signals; graduate patterns into rules. Use for session retrospectives.'
category: workflow-optimization
alwaysApply: false
trigger: friction, friction detection, session retrospective, learning pipeline, recurring mistakes, pattern graduation, friction report
model_hint: standard

Friction-to-Learning Pipeline

Overview

Detect friction signals during agent execution, track them across sessions, and graduate recurring patterns into permanent guidance. Bridges the gap between ephemeral session friction and durable CLAUDE.md rules.

**Research backing**: Claude Coach (hook-based friction detection with SQLite storage), alirezarezvani's self-improving-agent (three-tier MEMORY to CLAUDE.md graduation), and the ACE framework (arXiv: evolving playbooks from execution feedback, +10.6% on agent tasks).

**Current gap**: LEARNINGS.md exists but requires manual aggregation via `/abstract:aggregate-logs`. This skill adds automatic friction detection and a structured promotion path.

Friction Signal Types

| Signal | Detection Method | Weight | |--------|-----------------|--------| | Repeated corrections | User overrides same tool call 2+ times in session | High | | Command failures | Exit code != 0 patterns (same command type fails repeatedly) | Medium | | Permission denials | User denies tool call, indicating unexpected behavior | High | | Re-reads | Same file read 3+ times in session (lost context) | Low | | Retry loops | Same action attempted 3+ times with variations | Medium | | User frustration | Explicit negative feedback or correction language | High |

Weight scoring: High = 3, Medium = 2, Low = 1 points per occurrence. Weighted score determines graduation velocity.

Three-Tier Storage Graduation

Tier 1: Friction Log (ephemeral, per-session)
  Location: ~/.claude/friction/sessions/{date}-{id}.json
  Retention: 30 days, then pruned
  Threshold: 1 occurrence, logged, no action

Tier 2: Pattern Candidate (persistent, LEARNINGS.md)
  Location: ~/.claude/skills/LEARNINGS.md (friction section)
  Threshold: 3+ occurrences across 2+ sessions
  Action: flagged for review in next friction report

Tier 3: Graduated Rule (CLAUDE.md or skill update)
  Threshold: reviewed + user-approved
  Action: permanent guidance added to project/user config
  Constraint: NEVER auto-modify CLAUDE.md

Graduation Formula

graduation_score = (weighted_count * recency_factor) / sessions_seen

recency_factor:
  last 7 days  = 1.0
  8-14 days    = 0.7
  15-30 days   = 0.4
  31+ days     = 0.1

Tier 2 threshold: graduation_score >= 6.0
Tier 3 proposal:  graduation_score >= 12.0

Detection Workflow

Run at session end, at 80% context usage (via `conserve:clear-context`), or after failed improvement cycles (when `abstract:metacognitive-self-mod` detects regression).

Step 1: Scan Session for Signals

For each friction indicator found, wrap it in the shared session-capture envelope (ADR-0011) so downstream readers can ingest friction signals and trace-capture entries through one parser:

{
  "schema_version": "session-capture/1",
  "session_id": "2026-04-14-abc12345",
  "timestamp": "2026-04-14T10:23:00Z",
  "source": "friction-detector",
  "payload": {
    "signal_type": "retry_loop",
    "description": "rg command failed 3x, fell back to grep",
    "context": "searching for pattern in node_modules",
    "weight": "medium"
  }
}

Legacy files written before envelope adoption are read as ``session-capture/0`` (entire file treated as the payload). See ``docs/adr/0011-session-capture-envelope.md`` for the contract and migration path.

Step 2: Compare Against Existing Log

FRICTION_DIR=~/.claude/friction/sessions
mkdir -p "$FRICTION_DIR"

# Count prior occurrences of similar signals
if command -v rg &>/dev/null; then
  rg -c "$SIGNAL_TYPE" "$FRICTION_DIR"/*.json 2>/dev/null || echo "0"
else
  grep -rc "$SIGNAL_TYPE" "$FRICTION_DIR"/*.json 2>/dev/null || echo "0"
fi

Step 3: Calculate Graduation Score

Aggregate across session logs: sum weighted occurrences, apply recency decay, divide by session count, compare against tier thresholds.

Step 4: Propose Graduations

Tier 2 crossing: append to LEARNINGS.md friction section. Tier 3 crossing: present proposal with evidence to user, wait for explicit approval before any modification.

Step 5: Store Results

Write session log to `~/.claude/friction/sessions/{date}-{session_id}.json` and update `~/.claude/friction/index.json`.

Anti-Noise Rules

Ignore these signals:

1. **One-off failures**: transient network/CI errors (unless they recur 3+ times) 2. **User-initiated exploration**: deliberate experimentation is not agent error 3. **Already-graduated patterns**: covered by existing CLAUDE.md rules or skill instructions 4. **External tool failures**: MCP server crashes and similar tool bugs unrelated to agent behavior

Decay factor: signals older than 30 days contribute only 10% of their original weight (see graduation formula recency_factor).

Friction Report Format

## Friction Report: Session {date}

### New Signals (Tier 1)
- [RETRY] `rg` command failed 3x, fell back to `grep`
- [RE-READ] Read SKILL.md 4 times (lost file structure context)

### Recurring Patterns (Tier 2 candidates)
- [CORRECTION] User corrected file path format 4x across 3 sessions
  Score: 8.4 (threshold: 6.0)
  Candidate: Add path format guidance to CLAUDE.md

### Graduation Proposals (Tier 3)
- [RULE] "Always use absolute paths in Read tool"
  Evidence: 7 corrections across 5 sessions
  Score: 14.2 (threshold: 12.0)
  Action: Approve / Reject / Defer

### Noise Filtered
- 2 transient network timeouts (ignored)
- 1 user-initiated deep exploration (ignored)

Integration

**Feeds into**: LEARNINGS.md (Tier 2 patterns, same format as `/abstract:aggregate-logs`), `abstract:skill-improver` (priority scoring), and `abstract:metacognitive-self-mod`