What is sdd-mcp AGENTS.md?

Project instructions for sdd-mcp, a tool that guides coding work through approved requirements, design, task, and implementation stages.

Choosing the right workflow for small or formal changes, finding specifications and tests, and routing work to the appropriate model.

They prevent work from skipping review or approval stages and explain where project files belong.

How yi-john-huang/sdd-mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to yi-john-huang/sdd-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/yi-john-huang/sdd-mcp/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/yi-john-huang/sdd-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/yi-john-huang/sdd-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/yi-john-huang/sdd-mcp/agents-md)

Your own site

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

Per session 521 This file is loaded in full into every session.

When invoked 521 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	$0.00521	$0.00521
Opus 5.5	$0.00208	$0.00208
Sonnet 5.5	$0.00104	$0.00104
Haiku 4.5	$0.00052	$0.00052

Measured 1mo ago against content hash 5b625e6c5cb7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sdd-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 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.

AGENTS.md · 37 lines

How it starts

The opening of the file, as written. The whole thing — 37 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SDD-MCP Project Guidance

This repository develops sdd-mcp-server, a spec-driven workflow for Claude Code, Codex, and Oh My Pi (OMP).

Workflow

Install the chosen host target, reload it, and accept the host's project trust prompt before starting.
Small fixes: invoke /skill:simple-task.
Formal work: invoke /skill:sdd-requirements <feature-name>, then /skill:sdd-design, /skill:sdd-tasks, and /skill:sdd-implement after each explicit approval.
Never cross an unapproved phase. When configured, test-case review is a separate explicit decision before tasks approval.
Skills automatically restore durable status and approved compact context. Do not ask users to operate MCP tools or paste workflow JSON.

Repository layout

Canonical components: skills/, agents/, rules/, contexts/, hooks/, steering/, templates/.
Implementation: src/; focused tests: src/__tests__/.
Specifications and project steering: .spec/specs/ and .spec/steering/.
Generated native targets are installed under .claude/, .agents/ + .codex/, or .omp/; do not hand-edit generated files.

Model routing

Planning, architecture, review, and security run inline on Sol/medium by default in OMP. Project Sol/xhigh advisors are explicit opt-in.

Claude uses current-turn Opus/Sonnet routing. Codex may use one configured Sol/xhigh custom agent for review and security, after the user chooses once per session.

Review, security, and independent implementation slices ask once per session (inline or project agent). They ask only when agents are installed. Every skill reports agents started, parallelism, configured model/effort, and fallbacks.

Run implementation, TDD, simple tasks, and commits in the parent. Use agents only when at least two genuinely independent implementation slices can run concurrently.

If an advisor is explicitly invoked, allow one specialist without nesting. On model, auth, or agent failure, record one fallback and continue in the parent without retrying.

Read the full file on GitHub · 37 lines

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.

1mo ago Changed · +6 lines · +6 tokens per session 5b625e6c5cb7
1mo ago Changed · +4 lines · +99 tokens per session 5ba25c50813f
2mo ago First seen · 27 lines · 416 tokens per session scan A 7952efe723be

Subscribe to this mod's changes

sdd-mcp AGENTS.md is an instructions file published in the GitHub repository yi-john-huang/sdd-mcp (54 stars, last pushed 18d ago), licensed MIT. It adds 521 tokens to every session, about $0.0021 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 2026-08-30.

Planning

sdd-mcp AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
sdd-mcp AGENTS.mdyi-john-huang/sdd-mcp	Instructions file	54	18d ago	MIT	A	521	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	5,516	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
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	3d ago	MIT	A	4,313	Codex, OpenCode

sdd-mcp: Instructions file for Codex