ainb-fleet:atc

ainb-fleet:atc is a skill for Claude Code from stevengonsalvez/agents-in-a-box. It costs 254 tokens per session (3,688 once invoked), scanned B, original, MIT.

An Air Traffic Control service for coding-agent sessions: a scheduled supervisor that checks session state, continues safe cases, and alerts you about cases needing human help.

In plain words
What is it for?
Use it to supervise a fleet on a timer, respond to session errors or blocked work, auto-continue safe sessions, and notify your phone when intervention is needed.
Why use it?
It lets unattended sessions recover from routine problems while limiting repeated retries and escalating unresolved issues.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions Claude Code.

Part of the ainb-fleet plugin — 12 skills shipped together

Good fit Use it to supervise a fleet on a timer, respond to session errors or blocked work, auto-continue safe sessions, and notify your phone when intervention is needed.

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Install with agentmods
npx agentmods add skills/stevengonsalvez/agents-in-a-box/atc
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.

Any agent
npx skills add stevengonsalvez/agents-in-a-box --skill atc
Clone the repo
git clone --depth 1 https://github.com/stevengonsalvez/agents-in-a-box

Made for: Claude Code.

Or install ainb-fleet, the plugin that ships this one along with the rest of its 12 skills.

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 ainb-fleet:atc

README.md
[![agentmods](https://agentmods.dev/badge/skills/stevengonsalvez/agents-in-a-box/atc/github.svg)](https://agentmods.dev/skills/stevengonsalvez/agents-in-a-box/atc)
Your own site
<a href="https://agentmods.dev/skills/stevengonsalvez/agents-in-a-box/atc"><img src="https://agentmods.dev/badge/skills/stevengonsalvez/agents-in-a-box/atc/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 ainb-fleet:atc

Your own site · 80×15
<a href="https://agentmods.dev/skills/stevengonsalvez/agents-in-a-box/atc"><img src="https://agentmods.dev/badge/skills/stevengonsalvez/agents-in-a-box/atc.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 254 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,688 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. 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 $0.00254 $0.03688
Opus 5 $0.00127 $0.01844
Sonnet 5 $0.00051 $0.00738
Haiku 4.5 $0.00025 $0.00369

Measured 8d ago against content hash 1c4df64656d1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade B, and why

ainb-fleet:atc scanned grade B with 1 finding 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 8d 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

Code hooks into ~/.claude/settings.json. It auto-clears the safe/blocked
plugins/ainb-fleet/skills/atc/SKILL.md · 312 lines

How it starts

The opening of the file, as written. The whole thing — 312 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ainb fleet:atc — Air Traffic Control

ATC is the orchestrating brain that ties the fleet verbs together on a schedule with a policy. It is a real ainb run Claude session reading a generated CLAUDE.md, woken every N minutes by an OS timer. On each heartbeat it pulls the LLM-free ainb fleet needs --format json read, auto-clears the safe cases itself, and pages you (via the phone bridge) only for the calls that genuinely need a human.

hooks ─▶ events.jsonl ─▶ notifyd ─▶ current_state (ASK/ERR/WAIT/IDLE/RUNNING/DONE)
                                          │  (materialized per session)
OS timer ──[HEARTBEAT]──▶ ATC session ──reads──▶ ainb fleet needs --format json
                              │             (hooks-primary, tmux fallback)
                              ├─ auto-clear ─▶ ainb fleet broadcast (answer / continue)
                              └─ escalate ───▶ phone bridge ─▶ your phone

How ATC learns a session is blocked — HOOKS-PRIMARY

The fleet needs read ATC runs each heartbeat is event-sourced, not pane- scraped. Claude Code hooks append lifecycle events to events.jsonl; notifyd ingests them into a SQLite current_state table that materializes the latest stage per session (ASK / ERR / WAIT / IDLE / RUNNING / DONE). ATC reads that materialized state as the PRIMARY source — so it learns ASK/WAIT/IDLE/ERR from hooks, the instant they fire, without scraping panes. The tmux pane scan is only the fallback for sessions the hooks don't cover: non-Claude agents (Codex/Gemini fire no Claude hooks) and any session not yet materialized.

ainb fleet atc setup is what installs those global hooks into ~/.claude/settings.json (the --no-hooks flag skips it). The consumer skills (needs, fleet-needs, standup) do NOT install hooks — they only read the materialized state. So provisioning ATC is also what turns the whole fleet hooks-primary; without it (or without atc setup's hook install), fleet needs falls back to the live pane scan everywhere and still works.

Read the full file on GitHub · 312 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. 8d ago Changed · +73 lines · +49 tokens per session 1c4df64656d1
  2. 11d ago First seen · 239 lines · 205 tokens per session scan B 9e2edd39ab5a

Subscribe to this mod's changes

ainb-fleet:atc is a skill published in the GitHub repository stevengonsalvez/agents-in-a-box (23 stars, last pushed today), licensed MIT. It adds 254 tokens to every session and 3,688 once invoked, about $0.0013 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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