What is sumosign-mcp AGENTS.md?

Project instructions for an MCP server that connects an agent to the SumoSign REST API, a web service for electronic signatures. The instructions describe its technology, security limits, workflow, and available documentation.

Use them when developing or operating the server to follow its workflow, inspect relevant source and logs, and handle uploads, signature requests, status checks, and evidence downloads safely.

They give an agent the rules it must follow when using the server, including that an API key cannot complete a signature.

How meteordefect/sumosign-mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to meteordefect/sumosign-mcp. 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/meteordefect/sumosign-mcp/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/meteordefect/sumosign-mcp

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/meteordefect/sumosign-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/meteordefect/sumosign-mcp/agents-md)

Your own site

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

Per session 196 This file is loaded in full into every session.

When invoked 196 The same file — it is already loaded in full.

Security scan A 0 findings. 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	$0.00196	$0.00196
Opus 5.5	$0.00078	$0.00078
Sonnet 5.5	$0.00039	$0.00039
Haiku 4.5	$0.00020	$0.00020

Measured 2mo ago against content hash f701f43e9897, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sumosign-mcp AGENTS.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 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.

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.

AGENTS.md · 23 lines

What it actually says

AGENTS.md — @sumosign/mcp

Cursor router for the published MCP server package.

Stack

Node stdio MCP server wrapping the SumoSign REST API
Auth: SUMOSIGN_API_KEY (ss_live_…) — agent credential only
Default API: https://api.sumosign.app (SUMOSIGN_API_URL override)

Invariants

API key cannot complete a signature. Tools may upload/create/send/poll/download evidence only.
Prefer mirroring tool names/behavior with ../app/packages/mcp when both exist; this package is the publishable surface.

Available Resources

Core workflow → .cursor/rules/core-workflow.mdc
MCP conventions → .cursor/rules/mcp-conventions.mdc
README → README.md
Traces → docs/agent-traces/
Decisions → docs/decisions.md

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 · 23 lines · 196 tokens per session scan A f701f43e9897

Subscribe to this mod's changes

sumosign-mcp AGENTS.md is an instructions file published in the GitHub repository meteordefect/sumosign-mcp (0 stars, last pushed 1mo ago), licensed MIT. It adds 196 tokens to every session, about $0.0008 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.

sumosign-mcp AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
sumosign-mcp AGENTS.mdmeteordefect/sumosign-mcp	Instructions file	0	1mo ago	MIT	A	196	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	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,685	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	2,022	GitHub Copilot

sumosign-mcp: Instructions file for Codex