What is DecimerMCPServer AGENTS.md?

A project instruction file for DocMinus/DecimerMCPServer, a software project that identifies chemical structures in images and publishes its tools to the MCP Registry. It tells coding agents how to handle images, validate releases, and publish them.

Guiding chemical-image analysis responses, validating server.json, publishing tagged releases, and checking the project’s registry listing.

It gives agents consistent project rules for image responses and release publishing. This reduces mistakes such as returning the wrong JSON format or publishing an invalid server description.

How DocMinus/DecimerMCPServer configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to DocMinus/DecimerMCPServer. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/DocMinus/DecimerMCPServer/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/DocMinus/DecimerMCPServer

Made for: Codex, OpenCode.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/docminus/decimermcpserver/agents-md/github.svg)](https://agentmods.dev/instructions/docminus/decimermcpserver/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/docminus/decimermcpserver/agents-md"><img src="https://agentmods.dev/badge/instructions/docminus/decimermcpserver/agents-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/docminus/decimermcpserver/agents-md"><img src="https://agentmods.dev/badge/instructions/docminus/decimermcpserver/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 257 This file is loaded in full into every session.

When invoked 257 The same file — it is already loaded in full.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00257	$0.00257
Opus 5.5	$0.00103	$0.00103
Sonnet 5.5	$0.00051	$0.00051
Haiku 4.5	$0.00026	$0.00026

Measured 2mo ago against content hash 2ef1470e7c72, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 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.

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')

AGENTS.md · 39 lines

What it actually says

Project Agent Rules

Image Attachment Handling

User attaches image → execute:

Call decimer_analyze_chemical_image on 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: null when no structure detected
reason: null when classification succeeds

MCP Registry Publishing

Trigger: Tag push (v*) or manual dispatch.

Workflow:

Validate server.json against 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

Changes

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 · 39 lines · 257 tokens per session scan A 2ef1470e7c72

Subscribe to this mod's changes

DecimerMCPServer AGENTS.md is an instructions file published in the GitHub repository DocMinus/DecimerMCPServer (0 stars, last pushed 16d ago), licensed MIT. It adds 257 tokens to every session, about $0.0010 per session on Opus 5.5. 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.

DecimerMCPServer AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
DecimerMCPServer AGENTS.mdDocMinus/DecimerMCPServer	Instructions file	0	16d ago	MIT	A	257	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	275k	2d ago	MIT	A	4,313	Codex, OpenCode

DecimerMCPServer: Instructions file for Codex