Borrowing it
Nothing to install: this file belongs to hs737/mcp-server-for-ynab. 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/hs737/mcp-server-for-ynab/master/.agents/skills/contract-sync/SKILL.mdgit clone --depth 1 https://github.com/hs737/mcp-server-for-ynabWrote 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/skills/hs737/mcp-server-for-ynab/contract-sync)<a href="https://agentmods.dev/skills/hs737/mcp-server-for-ynab/contract-sync"><img src="https://agentmods.dev/badge/skills/hs737/mcp-server-for-ynab/contract-sync.svg" alt="Measured on agentmods" 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 | $0.00020 | $0.00600 |
| Opus 5 | $0.00010 | $0.00300 |
| Sonnet 5 | $0.00004 | $0.00120 |
| Haiku 4.5 | $0.00002 | $0.00060 |
Grade A, and why
contract-sync 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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Contract Sync
Use this skill when the repo has any source-of-truth contract and derived artifacts such as OpenAPI, JSON Schema, generated clients, MCP tool schemas, or prompt/task contracts.
Use When
- Changing HTTP routes or MCP tool inputs/outputs
- Changing request or response shapes (Pydantic models, dataclasses, TypedDicts)
- Changing schema-driven generated artifacts
- Updating public interface docs
- Updating codegen outputs
- Reviewing drift between source and generated files
Read First
AGENTS.md(if present)README.mdandpyproject.toml([project.scripts],[tool.*], optional dependency groups)CONTRIBUTING.mdif present and maintained- Contract-related docs in this repo (for example
docs/api-strategy.md,docs/contract-discipline.md) postman/or OpenAPI underdocs/api/, only if this repo maintains them- Generation scripts under
scripts/ortools/
Core Rules
- Identify the source of truth before editing anything.
- Common patterns in Python repos: Pydantic (or similar) models; FastAPI/Starlette route signatures; hand-authored OpenAPI; JSON Schema; MCP tool parameter schemas derived from types or explicit definitions.
- Derived artifacts (OpenAPI YAML, JSON Schema exports, generated clients, Postman collections) must be regenerated from that source unless the repo documents otherwise.
- Do not hand-edit generated artifacts unless the repo explicitly says to.
- Regenerate derived artifacts when the source changes, using commands in
pyproject.toml,Makefile,uv run,poetry run, or documented inREADME.md/AGENTS.md. - Commit source changes and generated changes together.
- Update docs that describe the public or shared contract surface.
- Ensure tests validate the actual interface (
pytest, contract tests, schema snapshots)—not only internal mocks.
Workflow
- Determine whether the change affects a contract.
- Identify the hand-authored source and the generated outputs (
pyproject.toml, CI config, repo docs). - Update the source of truth (models, tool definitions, route handlers).
- Run the appropriate generation or export step.
- Update any relevant docs or examples.
- Run the relevant tests or checks.
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.
- 6d ago First seen · 60 lines · 20 tokens per session scan A 1063deb43c04
contract-sync is a skill published in the GitHub repository hs737/mcp-server-for-ynab (1 stars, last pushed 3d ago), licensed Apache-2.0. It adds 20 tokens to every session and 600 once invoked, about $0.0001 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 2026-08-31.
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