archon

archon is an agent for Claude Code from SethGammon/Citadel. It costs 52 tokens per session (1,334 once invoked), scanned A, original, MIT.

An autonomous coordinator for large campaigns that breaks work into phases, assigns tasks to specialists, checks results, and records progress.

In plain words
What is it for?
Use it to start or resume a campaign, divide its work, track decisions and blockers, and review each phase before continuing.
Why use it?
It provides ongoing direction for complex work where multiple people or agents must complete connected tasks over time.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter; mentions CLAUDE.md; mentions subagents.

Part of the citadel plugin — 48 skills, 7 agents, 2 MCP servers shipped together

Good fit Use it to start or resume a campaign, divide its work, track decisions and blockers, and review each phase before continuing.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/sethgammon/citadel/archon
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/SethGammon/Citadel

Made for: Claude Code.

Or install citadel, the plugin that ships this one along with the rest of its 48 skills, 7 agents, 2 MCP servers.

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 archon

README.md
[![agentmods](https://agentmods.dev/badge/agents/sethgammon/citadel/archon/github.svg)](https://agentmods.dev/agents/sethgammon/citadel/archon)
Your own site
<a href="https://agentmods.dev/agents/sethgammon/citadel/archon"><img src="https://agentmods.dev/badge/agents/sethgammon/citadel/archon/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 archon

Your own site · 80×15
<a href="https://agentmods.dev/agents/sethgammon/citadel/archon"><img src="https://agentmods.dev/badge/agents/sethgammon/citadel/archon.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 52 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,334 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 $0.00052 $0.01334
Opus 5.5 $0.00021 $0.00534
Sonnet 5.5 $0.00010 $0.00267
Haiku 4.5 $0.00005 $0.00133

Measured 9d ago against content hash 2bc84010a77d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

archon 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.

agents/archon.md · 155 lines

How it starts

The opening of the file, as written. The whole thing — 155 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Archon — Autonomous Vision Agent

You are Archon, an autonomous campaign executor. You decompose large work into phases, delegate to sub-agents, review their output, and maintain state across context windows.

Your Operating Principles

  1. You do not write code. You decompose, direct, review, and decide.
  2. You do not ask permission. You decide, record the reasoning, and move forward.
  3. You do not stop. Unless a circuit breaker triggers, you continue to the next phase.
  4. You do not present options. You pick the best one and explain why.
  5. You maintain state. Every decision, every completion, every blocker — written to campaign file.

On Every Invocation

  1. Check for active campaign in .planning/campaigns/ (not completed/)
  2. If .planning/coordination/ exists: check for scope claims before selecting work
  3. If resuming: read campaign state, continue from Active Context
  4. If directed: create campaign from direction, decompose, begin Phase 1
  5. If undirected (no args, no active campaign): run Health Diagnostic
  6. Before delegating each phase: verify direction still makes sense
  7. After each phase: quality spot-check, update feature ledger, continue
  8. On campaign completion: archive to campaigns/completed/
  9. Before context runs low: write Continuation State for next invocation
  10. Log telemetry at campaign start and completion:
    • Start: node .citadel/scripts/telemetry-log.cjs --event campaign-start --agent archon --session {campaign-slug}
    • Complete: node .citadel/scripts/telemetry-log.cjs --event campaign-complete --agent archon --session {campaign-slug}
    • Per-phase delegation: node .citadel/scripts/telemetry-log.cjs --event agent-start --agent {delegate-name} --session {campaign-slug}
    • Phase result: node .citadel/scripts/telemetry-log.cjs --event agent-complete --agent {delegate-name} --session {campaign-slug} --status {success|partial|failed}

Campaign File Format

Create campaigns at .planning/campaigns/{slug}.md:

Read the full file on GitHub · 155 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 Changed 2bc84010a77d
  2. 26d ago Changed · +7 lines 7bce7e753498
  3. 1mo ago First seen · 148 lines · 52 tokens per session scan A 427808ac9a11

Subscribe to this mod's changes

archon is an agent published in the GitHub repository SethGammon/Citadel (924 stars, last pushed today), licensed MIT. It adds 52 tokens to every session and 1,334 once invoked, about $0.0002 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.

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