Borrowing it
Nothing to install: this file belongs to tsvillain/deprecation-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/tsvillain/deprecation-mcp/main/AGENTS.mdgit clone --depth 1 https://github.com/tsvillain/deprecation-mcpWrote 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/instructions/tsvillain/deprecation-mcp/agents-md)<a href="https://agentmods.dev/instructions/tsvillain/deprecation-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/tsvillain/deprecation-mcp/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/tsvillain/deprecation-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/tsvillain/deprecation-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00468 | $0.00468 |
| Opus 5.5 | $0.00187 | $0.00187 |
| Sonnet 5.5 | $0.00094 | $0.00094 |
| Haiku 4.5 | $0.00047 | $0.00047 |
Grade A, and why
deprecation-mcp 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 1mo 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.
What it actually says
Project agent memory
This file is the project's committed home for project-intrinsic agent knowledge: build, test, release, architecture, and sharp-edge notes that should travel with the code.
deprecation-mcp: open MCP server (stdio,@modelcontextprotocol/sdk), one toolcheck_deprecation. No payment/billing/metering code — keep it that way; this ships as a plain open server.- Build/test:
npm install && npm run build && npm test(pretestbuilds;node:testruns againstdist/). - Data lives in
data/deprecations.json, read at server startup (seesrc/data.ts) — no DB, no scraper, no network calls at runtime. Every record needs a realsource_urland accuratelast_verified_at; see README.md "Updating the dataset" for the bar.loadRecords()fails loudly (stderr + exit 1) on a missing/malformed/malshaped data file instead of throwing — keep diagnostics on stderr only, stdout is the MCP JSON-RPC channel. - Lookup/status logic:
src/lookup.ts. Tests:src/test/lookup.test.ts. - Drift detection:
src/scripts/check-drift.ts(npm run check-drift) fetches each record'ssource_url, compares a sha256 hash to the record'scontent_hash, and only ever flags — it never writesstatus,deprecated_on, etc. intodata/deprecations.json. Runs weekly via.github/workflows/check-drift.yml, which opens/updates adrift-check-labeled GitHub issue. See README.md "Drift detection" for the known false-positive limitation on 3 records with dynamic page content. When you re-verify a record by hand, recompute itscontent_hashtoo.
Maintaining this file
Keep this file for knowledge useful to almost every future agent session in this project. Do not repeat what the codebase already shows; point to the authoritative file or command instead. Prefer rewriting or pruning existing entries over appending new ones. When updating this file, preserve this bar for all agents and keep entries concise.
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.
- 1mo ago First seen · 27 lines · 468 tokens per session scan A 1d106acf7c38
deprecation-mcp AGENTS.md is an instructions file published in the GitHub repository tsvillain/deprecation-mcp (0 stars, last pushed 2mo ago), licensed MIT. It adds 468 tokens to every session, about $0.0019 per session on Opus 5.5. 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.
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).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
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 copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.