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 agentmods add instructions/kenn-io/msgvault/agents-mdgit clone --depth 1 https://github.com/kenn-io/msgvaultWhat 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 | $0.00707 | $0.00707 |
| Opus 5 | $0.00353 | $0.00353 |
| Sonnet 5 | $0.00141 | $0.00141 |
| Haiku 4.5 | $0.00071 | $0.00071 |
Grade A, and why
msgvault AGENTS.md 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 today.
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 — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file applies to all AI coding agents (Claude Code, Codex, Copilot CLI, etc.) operating in this repo.
Authoritative References
- Baseline operating principles:
CONSTITUTION.md(read and follow it before acting). - Project guide:
CLAUDE.md(this file is authoritative; AGENTS.md inherits its rules).
Roborev
- Never invoke the
roborev reviewCLI command in any form unless the user explicitly asks for it. Use all otherroborevCLI commands normally when they are appropriate for interacting with roborev. Never invoke a roborev skill (includingroborev-fixorroborev-design-review-branch) unless the user explicitly asks for that skill.
Content Hygiene
- Never name private downstream projects or other private codebases in public code, tests, fixtures, documentation, commit messages, pull requests, or issues. Describe the reusable requirement generically and run the private-data scrub before publishing.
- Do not add
Validation,Test plan, or equivalent command-run sections to pull request bodies. CI check results carry routine validation evidence; keep the PR description focused on rationale, behavior, and review boundaries.
Testing — Use testify
All Go tests use github.com/stretchr/testify. New tests and modifications to existing tests MUST use assert.X or require.X from testify — never t.Errorf, t.Fatalf, t.Fatal, or t.Error.
require.Xhalts on failure (wast.Fatal*). Use for setup or fatal preconditions.assert.Xcontinues on failure (wast.Error*). Use for independent value checks.- Equality takes
(want, got), not(got, want). Always:assert.Equal(t, want, got).
The mapping cheatsheet is in CLAUDE.md under the Testing section.
Testing — No Fake TDD
Do not add tautological tests that copy shell scripts into synthetic temp trees,
stub the primary commands, and only assert that the stub saw expected arguments.
Exercise the production path, a real validator/parser, or a built artifact
instead. See CLAUDE.md for the full rule and narrow exception.
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.
- today Changed · +6 lines · +51 tokens per session b8ceafd1fde3
- 2d ago First seen · 61 lines · 656 tokens per session scan A b13497fda721
msgvault AGENTS.md is an instructions file published in the GitHub repository kenn-io/msgvault (2,047 stars, last pushed today), licensed MIT. It adds 707 tokens to every session, about $0.0035 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.