cf-fix

name	cf-fix
description	Quick bug fix workflow. Use when the user reports a bug, error, or broken behavior — e.g. "fix this", "it's broken", "not working", "there's a bug", "I'm getting an error", "this crashes", "something is wrong", "why does this fail", "debug this", "it throws", "fix the issue", "resolve this error", "help me fix", "can you fix", "this doesn't work", "stopped working", "regression", "unexpected behavior", "failing test", "broken after update". Also triggers on stack traces, error messages, or descriptions of incorrect program behavior.
created	2026-02-17T00:00:00.000Z
updated	2026-07-04T00:00:00.000Z

/cf-fix

CLI Requirement: OPTIONAL — Uses the memory MCP from coding-friend-cli for fast indexed search and storage. Without the CLI: falls back to grep over docs/memory/ and direct file writes. Full functionality preserved, slower memory recall. See CLI requirements.

Fix the bug: $ARGUMENTS

Workflow

Step 0: Custom Guide

Custom guide — auto-loaded below (if the raw command shows instead of its output, run it yourself):

bash "${CLAUDE_PLUGIN_ROOT}/lib/load-custom-guide.sh" cf-fix

If output is not empty, integrate returned sections: ## Before → before first step, ## Rules → apply throughout, ## After → after final step.

Step 1: Understand the Bug

1. Read the error message or bug description from $ARGUMENTS
2. If no clear error, ask the user to describe the expected vs actual behavior
3. If the bug description is vague, ask: what did you expect? what happened instead? when does it happen?

Step 2: Verify the Problem Exists

1. Run the failing test or command that triggers the bug
2. Capture the exact error output
3. If you cannot reproduce, tell the user and ask for more context — do NOT guess
4. If no test exists AND --add-tests flag was used, write one that demonstrates the failure. Otherwise, reproduce by running the code directly or via existing tests.

Step 3: Recall Past Bugs + Explore Relevant Code

3a. Check existing bug docs (memory recall):

Before exploring, search for related past bugs. Extract 2-3 keywords from the bug description.

Primary — Memory MCP (if memory_search tool is available): Call memory_search with: { "query": "<bug keywords>", "type": "episode", "limit": 3 }

Fallback — grep (if memory MCP unavailable): Check {docsDir} from .coding-friend/config.json (default: docs).

1. Grep ^description: lines across {docsDir}/memory/bugs/**/*.md — match against bug keywords
2. If no match, grep ^tags: lines across {docsDir}/memory/bugs/**/*.md

If matches found, read the top 1-2 matched files — they may reveal known root causes or patterns. Include any relevant findings as context for the explorer.

3b. Generate task-id and explore relevant code (via cf-explorer agent):

1. Generate a task-id: use format YYYY-MM-DD-<short-descriptor> (e.g., 2026-05-03-fix-auth-race)
2. Determine docsDir: read from .coding-friend/config.json if present, default to docs
3. Context file path: {docsDir}/context/{task-id}.json

Launch the cf-explorer agent to gather context around the bug, passing the context file path so it writes structured findings.

Use the Agent tool with subagent_type: "coding-friend:cf-explorer". Pass:

Explore the codebase to help diagnose this bug: [bug description from $ARGUMENTS]

Error output: [from Step 2]

Context file: Write your structured findings to [docsDir/context/.json]

[If past bug docs were found in 3a]: Related past bugs found in memory: [summary of relevant findings]

Questions to answer:

1. What does the code path look like from the error location backward to the origin?
2. What are the relevant files, functions, and dependencies involved?
3. Are there existing tests covering this area?
4. What patterns or conventions might be relevant to the fix?

Wait for the cf-explorer to return its findings.

Step 4: Locate Root Cause

Using the cf-explorer's findings:

1. Read the error — full stack trace, not just the message

2. Trace backward from where the error appears to where it originates

3. The bug is usually NOT where the error shows up

4. State your hypothesis using this exact template before fixing:

   "I believe the root cause is [X] because [evidence]."

   Name a specific file, function, and line. "A state management issue" is not a hypothesis. "Stale cache in useUser at src/hooks/user.ts:42 because the dependency array is missing userId" is a hypothesis.

5. Rationalization Watch — if any of these surface, stop and re-examine:

   Thought	What it means	Rule
   "I'll just try this one thing"	No hypothesis, random-walking	Stop. Write the hypothesis first.
   "Probably the same issue as before"	Treating a new symptom as a known pattern	Re-read the execution path from scratch.
   "One more restart should fix it"	Avoiding the error message	Read the last error verbatim. Never restart more than twice without new evidence.
   "I'm confident it's X"	Confidence is not evidence	Run an instrument that proves it.

Step 5: Confirm Approach

Before changing code:

1. Tell the user what you believe the root cause is (using the template from Step 4)
2. Explain what you plan to change and why
3. If you're not confident, say so — ask for the user's input
4. Same symptom after a fix = hard stop. Do not attempt a second fix until you can state a new hypothesis with new evidence. Escalate immediately to cf-sys-debug if the symptom recurs unchanged.

Step 6: Implement Fix (via cf-implementer agent)

Dispatch the cf-implementer agent to fix the bug test-first. Use the Agent tool with subagent_type: "coding-friend:cf-implementer".

Pass the context file path from Step 3b so the agent can read the explorer's structured findings.

Prompt template:

Fix the following bug:

Bug: [description from $ARGUMENTS] Context file: [path to docsDir/context/.json] Root cause: [from Step 4] Fix approach: [confirmed in Step 5] Failing test/command: [from Step 2] Relevant files: [paths from explorer findings + root cause analysis in Step 4] Test patterns: [framework, test file locations, run command]

Requirements:

1. If --add-tests was passed and no regression test exists for this bug, write one first that demonstrates the failure. Otherwise, skip test writing and fix directly.
2. Fix the root cause — not the symptom. No try/catch to suppress errors.
3. One fix at a time — no additional changes
4. Run the full test suite — no regressions allowed
5. Report: what was fixed, tests written, and full test output as evidence

Capturing out-of-scope side-effects: While the implementer is working, if you notice a problem unrelated to the current bug that is non-trivial (fixing it inline would expand the scope of this fix), do NOT fix it now. Record it for later, then continue:

bash "${CLAUDE_PLUGIN_ROOT}/lib/capture-later.sh" \
  --name "<short title>" --description "<what & where — enough to act on cold>" \
  --source cf-fix [--slug <bug-doc/task slug, if one exists>] [--problem "<the bug being fixed>"]

This writes <docsDir>/later/YYYY-MM-DD-<name>.md with frontmatter (slug, problem, conversation_id). Trivial fixes the bug clearly requires stay inline.

Step 7: Verify Agent Results + Retry on Failure

Parse the last non-empty line of the cf-implementer's response for the result signal using a strict regex match — ^\[CF-RESULT: (success|failure)( .*)?\]$:

• [CF-RESULT: success] → proceed to Step 8
• [CF-RESULT: failure] <reason> → trigger retry (see below)
• Sentinel missing, malformed, or not on the last non-empty line → treat as failure with reason empty-output. Never assume silent success — a truncated or aborted agent run may produce output that looks complete but skipped the result signal.

On success:

1. Review the report — confirm the fix addresses the root cause from Step 4
2. Proceed to Step 8

Retry protocol (max 1 retry):

1. Notify the user (always visible):

   > ⟳ Attempt 1 failed (<reason>). Retrying with error context...
   

2. Update the context file — read the existing {docsDir}/context/{task-id}.json, add the previous_failure key, and write it back:

   {
     "task_id": "<task-id>",
     "task_summary": "<original task>",
     "relevant_files": ["..."],
     "key_findings": ["..."],
     "constraints": ["..."],
     "suggested_approach": "...",
     "previous_failure": {
       "reason": "<tests-failed|compile-error|empty-output>",
       "error_summary": "<brief error details from the agent's response>",
       "attempt": 1
     }
   }
   

Step 8: Save Bug Knowledge (conditional)

Only run this step if the fix required more than 1 attempt (i.e., the first fix attempt in Step 6/7 did not succeed and required re-dispatch or inline fixing). If the fix succeeded on the first attempt, skip to Step 9.

1. Read language config (local .coding-friend/config.json overrides global, default: en)
2. Construct a write spec and delegate to cf-writer agent via the Agent tool with subagent_type: "coding-friend:cf-writer" (use absolute path for file_path — use MAIN_REPO_ROOT from bootstrap context (fallback: pwd), read config from CF_CONFIG_FILE, use CF_DOCS_ROOT as docs base dir):

WRITE SPEC
----------
task: create
file_path: {CF_DOCS_ROOT}/memory/bugs/YYYY-MM-DD-{name}.md
language: {language from config}
content: |
  ---
  title: "<Short bug title>"
  description: "<One-line summary of the bug and fix, under 100 chars>"
  tags: [tag1, tag2, tag3]
  created: YYYY-MM-DD
  updated: YYYY-MM-DD
  type: episode
  importance: 3
  source: conversation
  ---

  # <Bug Title>

  ## Overview
  <What went wrong — symptom and context>

  ## Root Cause
  <What was actually wrong — the real cause, not the symptom>

  ## Fix
  <What was changed to fix it>

  ## Prevention
  <How to avoid this bug in the future>

  ## Related Files
  - `path/to/file1`
  - `path/to/file2`
readme_update: false
auto_commit: false
existing_file_action: skip

Backward compat: Existing bug memory files without a date prefix are still readable — do not rename them.

Frontmatter rules:

• description: factual summary for grep recall. Good: "Race condition in webhook handler causing duplicate payment processing". Bad: "Fixed a bug".
• tags: include error type, affected module, root cause category (e.g., [race-condition, webhooks, payments])

Step 8b: Index in CF Memory (MANDATORY)

This step is REQUIRED — do NOT skip it.

After the cf-writer saves the bug doc, you MUST call the memory_store MCP tool to index it in the database. This is a separate action from writing the file — the cf-writer agent does NOT do this.

Call memory_store with:

• title: from the frontmatter title
• description: from the frontmatter description
• type: episode
• tags: from the frontmatter tags
• content: the full markdown content (including frontmatter)
• importance: 3 (default)
• source: "auto-capture"
• index_only: true

If the MCP tool is unavailable, log a warning to the user but do NOT fail silently.

Show the user a 2-line summary:

• Markdown file: {docsDir}/memory/bugs/...md (created or updated)
• Memory DB: indexed ✓ — or: MCP unavailable, file only

Step 9: Auto-Review

Automatically invoke /cf-review — use the Skill tool with skill name coding-friend:cf-review. Do NOT ask the user first, just run it.

If review.withCodex: true is set in the config, cf-review automatically runs a Codex second-opinion review alongside Claude's and merges both — no flag needed here (cf-review reads the config itself).

Step 10: Performance Suggestion (conditional)

If the bug fix involved performance-critical code — e.g. database queries, API endpoints, loops over large datasets, memory management, caching, or I/O operations — suggest running /cf-optimize on the affected code path. Present it as an optional next step, do NOT auto-run.

Example: "The fix touched a database query path. Want to run /cf-optimize on it to verify performance hasn't regressed and look for optimization opportunities?"

If the fix was not performance-related, skip this step.

Completion Protocol

When the fix is complete (after Step 9/10), report using this format:

On success:

Root cause:   [what was wrong, file:line]
Fix:          [what changed, file:line]
Confirmed:    [evidence or test that proves the fix]
Tests:        [pass/fail count, regression test location]

Status: DONE, DONE_WITH_CONCERNS (state caveats), or BLOCKED (state what is unknown and what information is needed to proceed).

Escalation

If you've tried 2 fixes and the bug still persists, before attempting a 3rd fix:

1. Suggest /cf-learn — Ask the user: "This bug is taking multiple attempts. Want to run /cf-learn to capture the debugging insights so far before continuing?"
2. If the user agrees, invoke /cf-learn — use the Skill tool with skill name coding-friend:cf-learn
3. Then proceed with the 3rd attempt

If you've tried 3 fixes and the bug persists:

1. Stop fixing
2. Load the cf-sys-debug skill
3. Follow its full 4-phase process — the bug is likely deeper than expected

Quick Checks

Before diving deep, try these common causes first:

• Typo in variable/function name? Check spelling
• Wrong import path? Check relative vs absolute
• Stale cache/build? Clean and rebuild
• Missing dependency? Check package.json/requirements
• Environment mismatch? Check env vars, node version, etc.