Borrowing it
Nothing to install: this file belongs to dominik1001/caldav-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/dominik1001/caldav-mcp/main/AGENTS.mdgit clone --depth 1 https://github.com/dominik1001/caldav-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/dominik1001/caldav-mcp/agents-md)<a href="https://agentmods.dev/instructions/dominik1001/caldav-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/dominik1001/caldav-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/dominik1001/caldav-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/dominik1001/caldav-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 | $0.00437 | $0.00437 |
| Opus 5 | $0.00218 | $0.00218 |
| Sonnet 5 | $0.00087 | $0.00087 |
| Haiku 4.5 | $0.00044 | $0.00044 |
Grade A, and why
caldav-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 9d 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
caldav-mcp
MCP server exposing CalDAV calendar operations as tools for AI assistants.
Tech Stack
- TypeScript, ESM (
"type": "module"), Node ≥18, compiled withtsctodist/. - Biome for lint + format (
npm run check/check:fix) — do not add ESLint or Prettier. - Vitest for tests, lefthook for git hooks, semantic-release for publishing.
- Runtime deps:
@modelcontextprotocol/sdk,ts-caldav,zod.
Layout
src/index.ts— server entry; wires upStdioServerTransportand registers tools.src/tools/<tool>.ts— one file per MCP tool, with*.test.tsnext to it.- Credentials come from
.env(see.env.example); dev loads it viatsx --env-file=.env, notdotenv.
Workflow
- Dev:
npm run dev(watch). Build:npm run build. Test:npm test. - After implementing a new feature run the smoke tests (
npm run smokeandnpm run smoke:agent) to verify it works as expected.
Smoke tests
Two complementary end-to-end checks against a real CalDAV server (uses .env):
npm run smoke— deterministic SDK harness (scripts/smoke.ts). Spawns the built server over stdio via the MCP client SDK and asserts the create → list → update → delete round-trip. Fast, no LLM cost; safe to run in CI on every PR.npm run smoke:agent— agent-ergonomics harness (scripts/smoke-agent.sh). Drives the server viaclaude -pwith a JSON output schema, validating that tool names, descriptions, schemas, and error messages are usable by an LLM.
.mcp.json at the repo root registers the server (loads .env via node --env-file) so both the agent smoke and interactive Claude Code sessions pick it up automatically.
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.
- 9d ago First seen · 26 lines · 437 tokens per session scan A bcdfb69e6039
caldav-mcp AGENTS.md is an instructions file published in the GitHub repository dominik1001/caldav-mcp (99 stars, last pushed 2d ago), licensed MIT. It adds 437 tokens to every session, about $0.0022 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.
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