Borrowing it
Nothing to install: this file belongs to miziodel/navigravity. 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/miziodel/navigravity/main/.agent/skills/mcp-development/SKILL.mdgit clone --depth 1 https://github.com/miziodel/navigravityWrote 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/miziodel/navigravity/mcp-development)<a href="https://agentmods.dev/skills/miziodel/navigravity/mcp-development"><img src="https://agentmods.dev/badge/skills/miziodel/navigravity/mcp-development/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/skills/miziodel/navigravity/mcp-development"><img src="https://agentmods.dev/badge/skills/miziodel/navigravity/mcp-development.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 | $0.00021 | $0.00645 |
| Opus 5 | $0.00010 | $0.00322 |
| Sonnet 5 | $0.00004 | $0.00129 |
| Haiku 4.5 | $0.00002 | $0.00064 |
Grade A, and why
mcp-development 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 10d 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 — 49 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Development Standards
This skill defines the technical standards for the Navidrome MCP ecosystem.
1. Professional Logging (Local JSON)
We use a structured local JSON logging system. Do NOT use standard print() or basic logging.info().
- Implementation: Use the
@log_executiondecorator for all tools. - Pattern:
logger.info("Message", extra={"key": "value"})- Fields:
timestamp,level,name,message,tool,inputs,duration_ms,result_summary.
- Level: Use
DEBUGfor verbose tech details,INFOfor tool execution success,ERRORfor failures withexc_info=True.
2. Safety & Validation
- ID Validation: All Navidrome IDs should be validated as 32-character hex strings where possible.
- Fail Fast: If a dependency (like Navidrome connection) is down, the tool should return a structured error JSON instead of crashing.
- Fuzzy Fallback: For search tools, if a strict search returns no results, implement a secondary "fuzzy" search or broader query before giving up.
3. Code-to-Doc Synchronization (CRITICAL)
Architectural decisions in documentation MUST be mirrored in the MCP server resources.
- If
docs/architecture/curator_manifesto.mdis updated, theCURATOR_MANIFESTO_TEXTconstant insrc/navidrome_mcp_server.pyMUST be updated in the same task. - Ensure
usage_guide()prompt in code reflects all current tools available in the server.
4. Tool Protocol
- Naming: Use lowercase with underscores (e.g.,
get_smart_candidates). - Descriptions: Must be clear and describe parameters accurately for LLM consumption.
- Returns: Always return a JSON-stringified object or list for structured parsing.
4. TDD Workflow
Every bug fix or new tool MUST follow this cycle:
- Create a
tests/test_filename.py. - Write a test that reproduces the bug or defines the desired behavior.
- Verify the test fails.
- Implement the fix/feature in
src/navidrome_mcp_server.py. - Verify the test passes.
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.
- 10d ago First seen · 49 lines · 21 tokens per session scan A 3180a0fc5962
mcp-development is a skill published in the GitHub repository miziodel/navigravity (1 stars, last pushed 3mo ago), licensed MIT. It adds 21 tokens to every session and 645 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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