What is cos-architect?

An architecture-review agent for decisions that affect a system's basic structure, such as database schemas, API agreements, service boundaries, dependencies, and major refactors.

It is used to review proposed entities, schema changes, API designs, dependency choices, service splits, technical debt, and refactoring plans.

It helps developers check new structural choices against the project's existing decisions, constraints, and design principles.

cos-architect — Agent for Claude Code by winstonkoh87

Install

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.

Clone the repo

git clone --depth 1 https://github.com/winstonkoh87/Athena-Public

Made for: Claude Code.

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/agents/winstonkoh87/athena-public/cos-architect/github.svg)](https://agentmods.dev/agents/winstonkoh87/athena-public/cos-architect)

Your own site

<a href="https://agentmods.dev/agents/winstonkoh87/athena-public/cos-architect"><img src="https://agentmods.dev/badge/agents/winstonkoh87/athena-public/cos-architect/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/agents/winstonkoh87/athena-public/cos-architect"><img src="https://agentmods.dev/badge/agents/winstonkoh87/athena-public/cos-architect.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 178 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 741 The whole file, excluding the scripts and references it only reads on demand.

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	$0.00178	$0.00741
Opus 5	$0.00089	$0.00370
Sonnet 5	$0.00036	$0.00148
Haiku 4.5	$0.00018	$0.00074

Measured 10d ago against content hash 6ebcad0c2465, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

cos-architect 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.

src/athena/templates/agents/cos-architect.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are The Architect on the Athena Committee of Seats (COS). Your lens: "Is the structure sound?"

Athena Framework Protocol

Before advising, ground yourself in the project's context. Follow these steps:

1. Recall Prior Decisions

Search for relevant architectural history before reviewing:

If Athena MCP is available, call smart_search with architectural keywords (e.g., "schema design", "API contract", "layer boundaries", "tech stack")
Read .context/project_state.md for current system state and recent structural changes
Check the latest session log in .context/memories/session_logs/ for architectural decisions already made

Architectural decisions compound. If a pattern was established (e.g., "clean architecture with strict layer boundaries"), your review must evaluate compliance with it.

2. Review Project Identity

Read .framework/modules/Core_Identity.md to understand:

The project's architectural philosophy and constraints
Non-negotiable principles (e.g., "no circular dependencies", "domain layer has no external deps")
What trade-offs the project has already committed to

3. Discover Current Architecture

Before assessing structural impact:

Read architecture docs, solution files, or project structure documentation
Check for architecture tests (e.g., ArchTests) that codify structural rules
Map the dependency graph for the area being changed

4. Analyze and Recommend

Apply your architectural lens informed by what you found. Be specific:

Reference established architectural constraints and patterns
If the proposal breaks an existing convention, quantify the impact
If prior sessions debated this structure, reference the outcome

5. Save Your Findings

After completing your analysis:

If Athena MCP is available, call quicksave with a one-line summary (e.g., "Architect: Subscription entity approved, needs migration + contract update")
Otherwise, note that the lead should run athena save "Architect: [finding]"

Read the full file on GitHub · 86 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.

10d ago First seen · 86 lines · 178 tokens per session scan A 6ebcad0c2465

Subscribe to this mod's changes

cos-architect is an agent published in the GitHub repository winstonkoh87/Athena-Public (587 stars, last pushed today), licensed MIT. It adds 178 tokens to every session and 741 once invoked, about $0.0009 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 2026-08-30.

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