What is cairn-resync?

A skill for re-examining a project after its files, structure, or configuration have changed, then preparing updates and draft decisions for Cairn's stored project information.

Use it to detect configuration drift, group newly added topics, and create drafts for reviewing and updating Cairn's decisions and invariants.

It helps the recorded project information catch up with the actual codebase without automatically applying proposed changes.

cairn-resync — Skill for Claude Code by isaacriehm

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.

Any agent

npx skills add isaacriehm/cairn --skill cairn-resync

Clone the repo

git clone --depth 1 https://github.com/isaacriehm/cairn

Made for: Claude Code.

Or install cairn, the plugin that ships this one along with the rest of its 5 skills, 4 commands, 5 agents, 5 hooks, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/isaacriehm/cairn/cairn-resync.svg)](https://agentmods.dev/skills/isaacriehm/cairn/cairn-resync)

Your own site

<a href="https://agentmods.dev/skills/isaacriehm/cairn/cairn-resync"><img src="https://agentmods.dev/badge/skills/isaacriehm/cairn/cairn-resync.svg" alt="Measured on agentmods" height="20"></a>

Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,519 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00034	$0.01519
Opus 5	$0.00017	$0.00759
Sonnet 5	$0.00007	$0.00304
Haiku 4.5	$0.00003	$0.00152

Measured 7d ago against content hash feae287ee23a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

cairn-resync 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 7d 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.

packages/cairn-plugin/skills/cairn-resync/SKILL.md · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill: cairn-resync

Host portability

This skill is shared by Claude Code, Cursor, and Codex. Resolve Cairn MCP tools with the host's native discovery mechanism and use its structured question UI, falling back to a concise A/B/C chat question. Named curator briefs live under ../../agents/; dispatch them natively after reading the brief, or execute inline only when the host has no subagent capability.

You are running Cairn's operator-initiated re-discovery so committed ground state catches up to a tree that has grown or been restructured since adoption.

Everything here is opt-in, recoverable, and never auto-applies to committed ground: deterministic edits are review-class (the operator commits the diff); LLM passes spend the fast tier only on genuinely-new prose; re-curation produces _inbox/ drafts the operator drains. Confirm scope with the operator before any pass that spends model quota (re-cluster, re-curate).

Pass 1 — config-resync (deterministic, free)

Resolve the config-drift the sensor surfaced.

Preview: cairn_resync({}) (dry-run default). Summarize the proposed .cairn/config.yaml edits — add a grown dir to componentDirs, add a new file type to extensions, add a .gitignore entry to off_limits, drop a dead componentDir, re-point a moved entity's source_file.
On the operator's OK: cairn_resync({ apply: true }). It archives the pre-resync config.yaml to .cairn/ground/.archive/ and is idempotent. Tell the operator to review + commit the diff.
Pass area to scope either call to one subtree.

Pass 2 — topic re-cluster (LLM, opt-in)

Offer this when prose has moved/grown enough that the topic-index is stale. Confirm first — it spends the fast tier (only on new prose; unchanged pairs hit the cache).

Preview: cairn_resync({ recluster: true }) — re-walks + judges and reports topics_before → topics_after + judge_calls_fresh, but overwrites no map.
On OK: cairn_resync({ recluster: true, apply: true }) — archives the prior topic-index.yaml + anchor-map.yaml, then rebuilds them. The maps are gitignored, per-clone derived state, so there's nothing to commit.

Read the full file on GitHub · 122 lines

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.

7d ago First seen · 122 lines · 34 tokens per session scan A feae287ee23a

Subscribe to this mod's changes

cairn-resync is a skill published in the GitHub repository isaacriehm/cairn (6 stars, last pushed 1mo ago), licensed MIT. It adds 34 tokens to every session and 1,519 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 2026-08-31.

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