Borrowing it
Nothing to install: this file belongs to bitflight-devops/mcp-json-yaml-toml. 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/bitflight-devops/mcp-json-yaml-toml/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/bitflight-devops/mcp-json-yaml-tomlWrote 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/bitflight-devops/mcp-json-yaml-toml/copilot-instructions)<a href="https://agentmods.dev/instructions/bitflight-devops/mcp-json-yaml-toml/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/bitflight-devops/mcp-json-yaml-toml/copilot-instructions/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/bitflight-devops/mcp-json-yaml-toml/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/bitflight-devops/mcp-json-yaml-toml/copilot-instructions.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 | $0.02375 | $0.02375 |
| Opus 5.5 | $0.00950 | $0.00950 |
| Sonnet 5.5 | $0.00475 | $0.00475 |
| Haiku 4.5 | $0.00237 | $0.00237 |
Grade A, and why
mcp-json-yaml-toml copilot-instructions.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.
How it starts
The opening of the file, as written. The whole thing — 277 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Copilot Instructions - mcp-json-yaml-toml
Repository Overview
mcp-json-yaml-toml is a token-efficient, schema-aware MCP (Model Context Protocol) server for safely reading and modifying JSON, YAML, and TOML files. It provides AI assistants with structured data manipulation tools that preserve comments and formatting while enforcing schema validation.
- Size: ~2.4MB, 28 Python files
- Stack: Python 3.11-3.14, FastMCP, uv package manager, hatchling build backend
- Architecture: 100% local processing, no API keys required
- Cross-Platform: Works seamlessly on Windows, Linux, and macOS (any system where yq binary is supported)
- Key Features: yq-based transformations, SchemaStore.org integration, LMQL constraint validation
Prerequisites & Setup
Required Tools
- Python: 3.11-3.14 (CI tests against 3.11, 3.12, 3.13, 3.14)
- uv: Package manager (replaces pip/poetry/pipenv)
- Node.js: Required for markdown/prettier linting (npx commands)
Initial Setup
ALWAYS run this first after cloning:
uv sync # Installs all dependencies and dev-tools (~30-60 seconds)
This command:
- Creates
.venv/virtual environment - Installs all Python dependencies from
pyproject.toml - Installs dev dependencies (pytest, ruff, ty, prek)
- Is idempotent - safe to run multiple times
NEVER use pip install or bare python commands. Always use uv run <command>.
Validation Commands (CI Enforcement)
Recommended Approach: Use prek to run all validation checks in one command:
uv run prek run --files <file1> <file2> # For specific files
uv run prek run --all-files # For all files (use sparingly)
The prek tool automatically runs all the checks below in parallel. For debugging or CI reference, individual commands are listed:
Individual Validation Commands
These are automatically run by prek but can be executed separately if needed:
1. Code Formatting
uv run ruff format --check
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 Changed · -7 lines · -67 tokens per session 628413d0ce4c
- 2mo ago First seen · 284 lines · 2,442 tokens per session scan A f707ce6fa42c
mcp-json-yaml-toml copilot-instructions.md is an instructions file published in the GitHub repository bitflight-devops/mcp-json-yaml-toml (10 stars, last pushed yesterday), licensed MIT. It adds 2,375 tokens to every session, about $0.0095 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.
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