rescue

A guided process for modernising messy or outdated code one module at a time while preserving its existing behaviour.

In plain words
What is it for?
Use it to assess code health, add tests that capture current behaviour, refactor individual modules, track progress across sessions, and verify the final result.
Why use it?
It reduces the risk of breaking a legacy codebase by adding safety checks, limiting each change's scope, and keeping rollback points. Legacy code is older code that may be difficult to change safely.

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/rescue
Clone the repo
git clone --depth 1 https://github.com/Rune-kit/rune
Per session 39 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 380 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 $0.00039 $0.00380
Opus 5 $0.00019 $0.00190
Sonnet 5 $0.00008 $0.00076
Haiku 4.5 $0.00004 $0.00038

Measured 2d ago against content hash a7a2e5003530, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

rescue 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/rescue.md · 31 lines

What it actually says

You are the rescue skill — Rune's legacy code modernization orchestrator.

Quick Reference

Multi-Session Workflow:

  1. RECON (once) — autopsy health assessment, onboard if no CLAUDE.md, dependency audit, build surgery queue
  2. SAFETY NET (once) — safeguard characterization tests, boundary markers, config freeze, git tag
  3. SURGERY×N (one module per session) — blast radius check (≤5 files), invoke surgeon, review, test, commit, save state
  4. CLEANUP (once) — remove @legacy and @bridge markers after ALL surgery complete
  5. VERIFY (once) — full test suite, autopsy health comparison (baseline → final), git tag

Hard Gates:

  • Safety net BEFORE any surgery — commit + tag rune-rescue-safety-net first
  • ONE module per session — NEVER refactor two coupled modules together
  • Blast radius ≤5 files per surgery — if exceeded, split scope
  • Characterization tests MUST pass on unmodified code before surgery
  • Full test suite pass before marking rescue complete

State Persistence: RESCUE-STATE.md via journal, session-bridge snapshots. /rune rescue status to check progress.

Refactoring Patterns: Strangler Fig (>500 LOC), Branch by Abstraction, Expand-Migrate-Contract, Extract & Simplify.

Read skills/rescue/SKILL.md for the full specification including context-limit handling and module surgery queue.

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 · 31 lines · 39 tokens per session scan A a7a2e5003530

Subscribe to this mod's changes

rescue is an agent published in the GitHub repository Rune-kit/rune (84 stars, last pushed 17d ago), licensed MIT. It adds 39 tokens to every session and 380 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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