Borrowing it
Nothing to install: this file belongs to dominik1001/carddav-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/carddav-mcp/claude/beautiful-carson-4lqy46/CLAUDE.mdgit clone --depth 1 https://github.com/dominik1001/carddav-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/carddav-mcp/claude-md)<a href="https://agentmods.dev/instructions/dominik1001/carddav-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/dominik1001/carddav-mcp/claude-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/carddav-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/dominik1001/carddav-mcp/claude-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 | $0.00465 | $0.00465 |
| Opus 5.5 | $0.00186 | $0.00186 |
| Sonnet 5.5 | $0.00093 | $0.00093 |
| Haiku 4.5 | $0.00047 | $0.00047 |
Grade A, and why
carddav-mcp CLAUDE.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 2mo 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
carddav-mcp
MCP server exposing CardDAV contact 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,tsdav,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.src/tools/vcard.ts— minimal vCard 3.0 parse/serialize/partial-update helpers shared by the tools.- 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 CardDAV 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 → get → 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.
- 2mo ago First seen · 27 lines · 465 tokens per session scan A 3e599900d971
carddav-mcp CLAUDE.md is an instructions file published in the GitHub repository dominik1001/carddav-mcp (1 stars, last pushed 4mo ago), licensed MIT. It adds 465 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.
carddav-mcp CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| carddav-mcp CLAUDE.mddominik1001/carddav-mcp | Instructions file | 1 | 4mo ago | MIT | A | 465 | Claude Code |
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| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |