fleet-core

fleet-core is a skill for Claude Code, Codex from larcane97/clausona. It costs 53 tokens per session (4,437 once invoked), scanned B, original, MIT.

A shared set of rules for running groups of coding agents through clausona. A fleet is a main session that gives separate tasks to worker sessions, often in separate Git worktrees, which are isolated working copies of a repository.

In plain words
What is it for?
Use it when another fleet tool needs the common instructions for starting, checking, and removing parallel coding agents.
Why use it?
It keeps the different fleet runners consistent about setup, profiles, worktrees, shells, and worker management. On its own, it is supporting guidance rather than a standalone task.

Skill for Claude CodeCodex

Written for Claude Code and Codex: user-invocable in frontmatter, but also reads $CODEX_HOME. Also seen: reads .claude/ paths; mentions subagents; mentions Claude Code.

Part of the fleet-core plugin — 1 skill shipped together

Good fit Use it when another fleet tool needs the common instructions for starting, checking, and removing parallel coding agents.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/larcane97/clausona/fleet-core
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 larcane97/clausona --skill fleet-core
Clone the repo
git clone --depth 1 https://github.com/larcane97/clausona

Made for: Claude Code, Codex.

Or install fleet-core, the plugin that ships this one along with the rest of its 1 skill.

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 fleet-core

README.md
[![agentmods](https://agentmods.dev/badge/skills/larcane97/clausona/fleet-core/github.svg)](https://agentmods.dev/skills/larcane97/clausona/fleet-core)
Your own site
<a href="https://agentmods.dev/skills/larcane97/clausona/fleet-core"><img src="https://agentmods.dev/badge/skills/larcane97/clausona/fleet-core/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 fleet-core

Your own site · 80×15
<a href="https://agentmods.dev/skills/larcane97/clausona/fleet-core"><img src="https://agentmods.dev/badge/skills/larcane97/clausona/fleet-core.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,437 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 $0.00053 $0.04437
Opus 5.5 $0.00021 $0.01775
Sonnet 5.5 $0.00011 $0.00887
Haiku 4.5 $0.00005 $0.00444

Measured 9d ago against content hash 4276d5904d6c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

fleet-core 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 9d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/last-reply.mjs), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

`~/.codex/config.toml`. Then `CODEX_HOME`, and the variables a runner sets in its terminals such
plugins/fleet-core/skills/fleet-core/SKILL.md · 310 lines

How it starts

The opening of the file, as written. The whole thing — 310 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fleet rules shared by every runner

A fleet is one main session (Claude Code or Codex) that splits work into tasks and runs each task as a worker: a separate Claude Code or Codex session in its own git worktree, on a clausona profile. A profile is one account or one API endpoint, with its own sign-in and limits. Profiles of one tool share plugins and settings. csn is short for clausona.

The runner skill that loaded this one (Superset, herdr, Orca or tmux) says how to create worktrees, start workers, read them and remove them. This skill says everything else.

Shells. Commands here are written for a POSIX shell. Claude Code runs them in Bash, on Windows too (Git Bash). Codex on Windows runs PowerShell: there, read "$(cat <file>)" as (Get-Content -Raw <file>), $(command -v clausona) as (Get-Command clausona).Source, and <cmd> </dev/null as $null | <cmd>. ~ is your home directory: %USERPROFILE% on Windows. The shell can be zsh, which does not split an unquoted variable into words: loop over paths written out one by one, not over a variable holding several.

Hidden variables in Codex. A Codex config can pass your commands only a few environment variables: [shell_environment_policy] with inherit = "core" or "none", usually in ~/.codex/config.toml. Then CODEX_HOME, and the variables a runner sets in its terminals such as herdr's HERDR_*, look unset even when they are set. When one you need is unset in Codex, look for that setting. If it is there, tell the user: the fix is to start this Codex session again with -c shell_environment_policy.inherit=all added to its command, which changes that session only.

1. Profiles and the main session

clausona list --json lists the profiles.

  • Every profile has name, tool (claude or codex) and configDir.
  • A subscription profile has quota.state, quota.session.usedPercent (5H) and quota.weekly.usedPercent (7D). It can also have quota.scoped: the most used window of a limit on one model, named in its label. Claude's are weekly; a Codex one can be its 5-hour window, and windowSeconds says which.
  • An API profile has kind: "api" and model instead. These exist for Claude Code only.

Read the full file on GitHub · 310 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 · +24 lines · +5 tokens per session 4276d5904d6c
  2. 12d ago Changed · +1 lines f8744f2c961f
  3. 16d ago First seen · 285 lines · 48 tokens per session scan B ee750ab8519d

Subscribe to this mod's changes

fleet-core is a skill published in the GitHub repository larcane97/clausona (57 stars, last pushed 5d ago), licensed MIT. It adds 53 tokens to every session and 4,437 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-10-10.

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