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Agent skill

Cancel

by Q00 in Q00/ouroboros

“Cancel stuck or orphaned executions”

— description from SKILL.md by Q00
MITAuto-check passedAgent Workflows

Install Cancel

skills CLI
$ npx skills add Q00/ouroboros --skill cancel -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install Q00/ouroboros cancel --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/Q00/ouroboros.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/cancel .claude/skills/cancel && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
cancel
GitHub stars
6.2k
Token cost
~983 tokens
SKILL.md length
352 words
Files
1
Skills in repo
23
Repo updated
First seen
Licence
MIT

At a glance

  • Works in 3 steps: Bare (no args): Lists all active… → Explicit (execution_id): Cancels the… → all flag: Cancels every running or…
  • SKILL.md covers Usage, How It Works, Instructions and State Transitions, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

About this skill

Cancel is a skill in Q00/ouroboros (6.2k stars). Its SKILL.md is about 983 tokens. Licence: MIT.

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

  1. Bare (no args): Lists all active (running/paused) executions in a numbered table and prompts you to pick one to cancel
  2. Explicit (execution_id): Cancels the specified execution immediately
  3. all flag: Cancels every running or paused execution at once

What it can do on your machine

Read from SKILL.md and the folder at commit f587795. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Cancel loads about 983 tokens when it runs. Until then it costs about 11 tokens; SKILL.md has 352 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~11
When it runs · the whole SKILL.md, loaded when a task matches
~983

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Q00/ouroboros at commit f587795, republished under its MIT licence (© Q00). 352 words, ~983 tokens.

Download SKILL.mdSave it as .claude/skills/cancel/SKILL.md (or your agent's skills folder).
name
cancel
description
Cancel stuck or orphaned executions
aliases
kill, abort

/ouroboros:cancel

Cancel stuck or orphaned executions by session ID, cancel all running sessions, or interactively pick from active executions.

Usage

/ouroboros:cancel                          # Interactive: list active, pick one
/ouroboros:cancel <execution_id>           # Cancel specific execution
/ouroboros:cancel --all                    # Cancel all running executions

Trigger keywords: "cancel execution", "kill session", "stop running", "abort execution"

How It Works

This skill interacts directly with the event store (not via MCP tool) to emit cancellation events. It uses the CLI command under the hood.

Three modes:

  1. Bare (no args): Lists all active (running/paused) executions in a numbered table and prompts you to pick one to cancel
  2. Explicit (execution_id): Cancels the specified execution immediately
  3. --all flag: Cancels every running or paused execution at once

Instructions

When the user invokes this skill:

  1. Determine which mode to use:

    • If the user provided an execution/session ID: Explicit mode
    • If the user says "cancel all" or "cancel everything": --all mode
    • If no ID given and not "all": Bare mode (interactive listing)

  2. Run the appropriate CLI command using Bash:

    Bare mode (interactive):

    bash
    ouroboros cancel execution

    This will list active executions and prompt for selection.

    Explicit mode (specific execution):

    bash
    ouroboros cancel execution <execution_id>

    Cancel all mode:

    bash
    ouroboros cancel execution --all

    With custom reason:

    bash
    ouroboros cancel execution <execution_id> --reason "Stuck for 2 hours"

  3. Present results to the user:

    • Show which executions were cancelled
    • If bare mode, show the list and selection prompt
    • If no active executions, inform the user

  4. End with a next-step suggestion:

    • After cancellation: ◆ Cancelled — use ooo status to verify, or ooo run to start fresh
    • No active sessions: ◆ No active executions — use ooo run to start a new one
Show full SKILL.md (118 more words)Show less

State Transitions

Only sessions in running or paused status can be cancelled. Sessions that are already completed, failed, or cancelled are skipped with a warning.

Fallback (No Database)

If the configured runtime EventStore does not exist:

No Ouroboros database found at the configured runtime path.
Run an execution first with: /ouroboros:ouroboros-run

Example

User: cancel that stuck execution

> ouroboros cancel execution

Active Executions
┌───┬──────────────────┬──────────────┬─────────┬─────────┬──────────────┐
│ # │ Session ID       │ Execution ID │ Seed ID │ Status  │ Started      │
├───┼──────────────────┼──────────────┼─────────┼─────────┼──────────────┤
│ 1 │ sess-abc-123     │ exec-001     │ seed-42 │ running │ 2024-01-15   │
│ 2 │ sess-def-456     │ exec-002     │ seed-99 │ paused  │ 2024-01-14   │
└───┴──────────────────┴──────────────┴─────────┴─────────┴──────────────┘

Enter number to cancel (1-2), or 'q' to quit: 1
Cancel session sess-abc-123 (running)? [y/N]: y
✓ Cancelled execution: sess-abc-123

◆ Cancelled — use `ooo status` to verify, or `ooo run` to start fresh

Your final response MUST end with exactly one breadcrumb footer line:

◆ <current state> → next: <recommended action>

Derive <current state> from live session state via ouroboros_session_status when that MCP projection is available; otherwise derive it from this skill's actual outcome. Never use a linear Step N of M footer because Ouroboros is an evolutionary loop. When the next action is genuinely a choice, list 2-3 honest options in the next: clause. The breadcrumb line must be the last line of the response.

© Q00, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/cancel of Q00/ouroboros.

Open the folder on GitHubat commit f587795

Compare with similar skills

Cancel next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Cancel compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Cancel this skillQ00/ouroboros6.2k—~983Automated safety check: PassMIT
MCP Server Builderanthropics/skills180k64 repos~2.3kAutomated safety check: PassApache-2.0
Hook Development for Claude Code Pluginsanthropics/claude-plugins-official38k11 repos~4.1kAutomated safety check: NotesApache-2.0
Using Superpowersfarm-fe/farm5.6k35 repos~1.4kAutomated safety check: PassMIT
Executing Plans Inlineobra/superpowers296k2 repos~5.1kAutomated safety check: PassMIT
Claude Code Agent Developmentanthropics/claude-plugins-official38k8 repos~2.8kAutomated safety check: PassApache-2.0

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Categories

Questions about Cancel

How do I install Cancel in Claude Code?

Run `npx skills add Q00/ouroboros --skill cancel -a claude-code`. Or copy the skill folder (skills/cancel in Q00/ouroboros) into .claude/skills/cancel in your project. Claude Code loads it when a task matches its description.

How do I install Cancel in Codex?

Run `npx skills add Q00/ouroboros --skill cancel -a codex`. Or copy the skill folder (skills/cancel in Q00/ouroboros) into .agents/skills/cancel in your project. Codex loads it when a task matches its description.

Can I use Cancel in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Q00/ouroboros --skill cancel -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cancel, .gemini/skills/cancel, .github/skills/cancel and .opencode/skills/cancel in your project.

What does Cancel need to run?

SKILL.md names no scripts, command-line tools or credentials: Cancel is instructions for the agent only.

Does Cancel access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Cancel safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Cancel use?

Cancel is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Cancel use?

About 983 tokens (SKILL.md is roughly 3.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Cancel?

Skills that share tags, products or a category with Cancel: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 296k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Cancel?

Q00 (a GitHub user) maintains it in Q00/ouroboros, which has 6,194 GitHub stars. The repository holds 23 skills in this directory. The repository was last updated on October 7, 2026.

Source: Q00/ouroboros on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.