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.
npx skills add isaacriehm/cairn --skill cairn-directiongit clone --depth 1 https://github.com/isaacriehm/cairnWrote 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.
[](https://agentmods.dev/skills/isaacriehm/cairn/cairn-direction)<a href="https://agentmods.dev/skills/isaacriehm/cairn/cairn-direction"><img src="https://agentmods.dev/badge/skills/isaacriehm/cairn/cairn-direction.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00032 | $0.04059 |
| Opus 5 | $0.00016 | $0.02030 |
| Sonnet 5 | $0.00006 | $0.00812 |
| Haiku 4.5 | $0.00003 | $0.00406 |
Grade A, and why
cairn-direction 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 8d 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.
How it starts
The opening of the file, as written. The whole thing — 326 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: cairn-direction
Host portability
This skill is shared by Claude Code, Cursor, and Codex. Resolve Cairn MCP
tools with the host's native discovery mechanism. AskUserQuestion means the
host's structured question UI; if unavailable, ask the same concise A/B/C
question in chat and pause. Dispatch plans use the host's native subagent
tool. When a named Cairn role is required, read its brief under
../../agents/ and pass that brief to the native subagent; execute inline
only when the host has no subagent capability.
Convert loose operator prompts into tightened specs + dispatched
work. Long-form playbooks live in docs/PLUGIN_ARCHITECTURE.md §11
(rejection capture, pivot, mission scope, dispatch block,
autonomous continuation) and §14 (question quality). This file is
the entry-point summary.
Step 0 — preload deferred tools (REQUIRED FIRST)
Preload only the WRITE + judgment tools. The read-only context tools
(cairn_in_scope, cairn_canonical_for_topic, cairn_components_in_scope,
cairn_component_get, cairn_mission_get, cairn_search) are no longer
preloaded — the server now injects your frame for you:
- SessionStart / UserPromptSubmit inject the working-context header: active task, mission + phase, and the in-scope DEC/INV id index.
- PostToolUse(Read) injects the DEC/INV bodies + the component slice bound to files as you open them (each once per session).
Load any of those read tools on demand only — when you need a body the header didn't carry, or a mission field the header omitted.
ToolSearch(select:mcp__plugin_cairn_cairn__cairn_task_create,mcp__plugin_cairn_cairn__cairn_task_complete,mcp__plugin_cairn_cairn__cairn_task_journal_append,mcp__plugin_cairn_cairn__cairn_record_decision,mcp__plugin_cairn_cairn__cairn_component_annotate,mcp__plugin_cairn_cairn__cairn_mission_start,mcp__plugin_cairn_cairn__cairn_mission_accept_draft,mcp__plugin_cairn_cairn__cairn_mission_plan_phase,mcp__plugin_cairn_cairn__cairn_mission_advance,mcp__plugin_cairn_cairn__cairn_mission_set_exit_gate,AskUserQuestion)
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.
- 8d ago First seen · 326 lines · 32 tokens per session scan A 5e35b565ebcf
cairn-direction is a skill published in the GitHub repository isaacriehm/cairn (6 stars, last pushed 1mo ago), licensed MIT. It adds 32 tokens to every session and 4,059 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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