Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/docminus/decimermcpserver/agents-mdgit clone --depth 1 https://github.com/DocMinus/DecimerMCPServerWhat 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 | $0.00257 | $0.00257 |
| Opus 5 | $0.00129 | $0.00129 |
| Sonnet 5 | $0.00051 | $0.00051 |
| Haiku 4.5 | $0.00026 | $0.00026 |
Grade A, and why
DecimerMCPServer AGENTS.md scanned grade A with 1 finding 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 yesterday.
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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
python -c "import json, jsonschema, urllib.request; schema = json.loads(urllib.request.urlopen('https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json').read()); data = json.load(open('server.json') What it actually says
Project Agent Rules
Image Attachment Handling
User attaches image → execute:
- Call
decimer_analyze_chemical_imageon attached image - Return compact JSON only:
{"is_structure": <true|false>, "smiles": <string|null>, "reason": <string|null>}
Requirements:
- No markdown fences
- No explanation/prefix/suffix
smiles: nullwhen no structure detectedreason: nullwhen classification succeeds
MCP Registry Publishing
Trigger: Tag push (v*) or manual dispatch.
Workflow:
- Validate
server.jsonagainst schema - Publish via
modelcontextprotocol/registry-action@v1 - Verify registry listing
Manual publish:
# Validate
uv pip install jsonschema
python -c "import json, jsonschema, urllib.request; schema = json.loads(urllib.request.urlopen('https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json').read()); data = json.load(open('server.json')); jsonschema.validate(data, schema); print('Valid!')"
# Publish (requires auth token in secrets)
Registry: https://registry.modelcontextprotocol.io
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.
- yesterday First seen · 39 lines · 257 tokens per session scan A 2ef1470e7c72
DecimerMCPServer AGENTS.md is an instructions file published in the GitHub repository DocMinus/DecimerMCPServer (0 stars, last pushed 4mo ago), licensed MIT. It adds 257 tokens to every session, about $0.0013 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other instructions, from other repositories
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
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Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.