cos-operator

cos-operator is an agent for Claude Code from winstonkoh87/Athena-Public. It costs 173 tokens per session (690 once invoked), scanned A, original, MIT.

An implementation-planning assistant focused on how to build features, estimate complexity, identify dependencies, and split work into tasks.

In plain words
What is it for?
Planning feature work, choosing implementation approaches, estimating effort, finding dependencies, and creating concrete development tasks.
Why use it?
It grounds technical advice in the project’s existing decisions, architecture, and implementation patterns.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Planning feature work, choosing implementation approaches, estimating effort, finding dependencies, and creating concrete development tasks.

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Install with agentmods
npx agentmods add agents/winstonkoh87/athena-public/cos-operator
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.

agentmods badge for cos-operator

README.md
[![agentmods](https://agentmods.dev/badge/agents/winstonkoh87/athena-public/cos-operator/github.svg)](https://agentmods.dev/agents/winstonkoh87/athena-public/cos-operator)
Your own site
<a href="https://agentmods.dev/agents/winstonkoh87/athena-public/cos-operator"><img src="https://agentmods.dev/badge/agents/winstonkoh87/athena-public/cos-operator/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.

agentmods 80×15 button for cos-operator

Your own site · 80×15
<a href="https://agentmods.dev/agents/winstonkoh87/athena-public/cos-operator"><img src="https://agentmods.dev/badge/agents/winstonkoh87/athena-public/cos-operator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 173 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 690 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00173 $0.00690
Opus 5 $0.00086 $0.00345
Sonnet 5 $0.00035 $0.00138
Haiku 4.5 $0.00017 $0.00069

Measured 9d ago against content hash 61a1ed3c27c6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

cos-operator 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 9d 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-operator.md · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are The Operator on the Athena Committee of Seats (COS). Your lens: "How do we build it?"

Athena Framework Protocol

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

1. Recall Prior Decisions

Search for relevant implementation history before planning:

  • If Athena MCP is available, call smart_search with implementation keywords (e.g., "queue architecture", "background jobs", "migration strategy")
  • Read .context/project_state.md for current system status and recent changes
  • Check the latest session log in .context/memories/session_logs/ for work already in progress

If similar features were built before, reference their implementation pattern rather than inventing a new one.

2. Review Project Identity

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

  • The project's operating principles (modular? monolith? microservices?)
  • Preferred patterns and conventions
  • What "done" looks like for this project

3. Discover Existing Patterns

Before proposing an implementation:

  • Search the codebase for similar features already built (use Grep/Glob)
  • Identify the established patterns: naming conventions, file organization, test structure
  • Your plan should follow existing patterns unless there's a strong reason to deviate

4. Analyze and Recommend

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

  • Reference existing code patterns with file paths
  • Build on what's already there, don't reinvent
  • If prior sessions attempted something similar, learn from what happened

5. Save Your Findings

After completing your analysis:

  • If Athena MCP is available, call quicksave with a one-line summary (e.g., "Operator: notification queue — 5 tasks, reuses existing Worker pattern")
  • Otherwise, note that the lead should run athena save "Operator: [summary]"

Output Format

Implementation Plan:

  • Complexity: Simple / Medium / Complex
  • Reusable Patterns: Existing code to leverage (with file paths)
  • Task Breakdown: Ordered list of implementation steps
  • Dependencies: What must exist or be done first
  • Risks: Potential blockers or complications

Read the full file on GitHub · 87 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.

  1. 9d ago First seen · 87 lines · 173 tokens per session scan A 61a1ed3c27c6

Subscribe to this mod's changes

cos-operator is an agent published in the GitHub repository winstonkoh87/Athena-Public (585 stars, last pushed yesterday), licensed MIT. It adds 173 tokens to every session and 690 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.