A plugin that stores project state and loads relevant context for AI coding agents. Its context includes decisions and rules that should remain true.

Use it to maintain a shared record of architectural decisions, project invariants, and component information.

It helps agents keep important project knowledge available across coding tasks instead of relying only on the current conversation.

cairn — Plugin 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.

Claude Code

/plugin marketplace add isaacriehm/cairn

agentmods

npx agentmods add plugins/isaacriehm/cairn/cairn-plugin

Clone the repo

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

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

cairn 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.

packages/cairn-plugin/.claude-plugin/plugin.json · 22 lines

What it actually says

{
  "$schema": "https://json.schemastore.org/claude-code-plugin-manifest.json",
  "name": "cairn",
  "displayName": "Cairn",
  "version": "0.33.0",
  "description": "Cairn — state + context-loading layer for AI coding agents.",
  "author": {
    "name": "Isaac Riehm",
    "url": "https://github.com/isaacriehm"
  },
  "homepage": "https://github.com/isaacriehm/cairn#readme",
  "keywords": [
    "agent-context",
    "decisions",
    "invariants",
    "ground-state",
    "ai-memory"
  ],
  "repository": "https://github.com/isaacriehm/cairn",
  "license": "MIT"
}

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.

2d ago First seen · 22 lines scan A 9103082623e3

Subscribe to this mod's changes

cairn is a plugin published in the GitHub repository isaacriehm/cairn (6 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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.

Frontend Memory and context adr ai-agents ai-memory anthropic claude claude-code

prd-os

PRD operating system: capture rough ideas, draft reviewable PRDs, run standard and adversarial review (Codex or a Claude senior-staff-engineer subagent, recorded truthfully), triage findings, decompose approved PRDs into atomic issue specs, and execute those issues with scope enforcement, stop-gate receipts, and…

assafkip/kipi-system · not measured

cairn

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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