fix

A code-change executor that applies an existing diagnosis or review finding. It locates the affected files, makes the smallest needed change, and verifies the result.

In plain words
What is it for?
It helps implement diagnosed bug fixes or review corrections, then reports the modified files and verification results.
Why use it?
It prevents blind fixes by requiring a known cause before editing code and by checking each change with tests or other validation.

Agent

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/rune-kit/rune/fix
Clone the repo
git clone --depth 1 https://github.com/Rune-kit/rune
Per session 36 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 506 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00036 $0.00506
Opus 5 $0.00018 $0.00253
Sonnet 5 $0.00007 $0.00101
Haiku 4.5 $0.00004 $0.00051

Measured 2d ago against content hash fa8c493b980a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fix scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/fix.md · 45 lines

What it actually says

You are the fix skill — Rune's code change executor.

Step 0 — Prerequisite Check

  1. Diagnosis exists? Check for debug report, review findings, or clear error description. If root cause is UNKNOWN → invoke rune:debug first. Do NOT guess at fixes.
  2. Within cook workflow? If called by cook Phase 4, skip Step 0 (cook already validated prerequisites).

Only proceed to fixing after Step 0 is satisfied.

Quick Reference

Workflow:

  1. Understand — read incoming request (debug report, plan spec, review finding)
  2. Recovery Policy — classify error type → determine action (AUTO_FIX, RETRY, ABORT, PROMPT_USER, INVESTIGATE)
  3. Locate — scout finds files, Read examines code, map touch points
  4. Change — apply minimal changes (Edit for existing, Write for new only)
  5. Verify — run tests after EACH fix (never batch untested changes)
  6. Post-Fix Hardening — add validation at every layer data passes through
  7. Self-Review — hallucination-guard imports, check API usage
  8. Report — list files modified + verification results

Critical Rules:

  • NEVER change test files to make tests pass — fix CODE, not TESTS
  • MUST have diagnosis before fixing — no blind fixes
  • MUST run tests after EACH individual fix
  • Max 3 fix attempts → re-diagnose (debug classifies: wrong approach or wrong design)
  • MUST NOT add unplanned features — fix ONLY the diagnosed problem
  • Quality Decay Check: >20% WTF-likelihood = STOP. Hard cap 30 fixes/session.

Recovery Policy Matrix:

  • INPUT_REQUIRED / PERMISSION_DENIED / ENVIRONMENT_ERROR → PROMPT_USER
  • INPUT_INVALID / DEPENDENCY_ERROR → AUTO_FIX
  • TIMEOUT → RETRY (with backoff)
  • POLICY_BLOCKED → ABORT
  • LOGIC_ERROR → INVESTIGATE (back to debug)

Read skills/fix/SKILL.md for the full specification including debug instrumentation preservation.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 45 lines · 36 tokens per session scan A fa8c493b980a

Subscribe to this mod's changes

fix is an agent published in the GitHub repository Rune-kit/rune (84 stars, last pushed 16d ago), licensed MIT. It adds 36 tokens to every session and 506 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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