Agent skill

Skill Debug

Debug a reproducible symptom with a bounded feedback loop and original-scenario verification

MITAuto-check passedDevelopment

Install Skill Debug

skills CLI

$ npx skills add nyldn/claude-octopus --skill skill-debug -a claude-code

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

GitHub CLI

$ gh skill install nyldn/claude-octopus skill-debug --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/nyldn/claude-octopus.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/skill-debug .claude/skills/skill-debug && 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/

Paste into Claude Code

Install the "skill-debug" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-debug into .claude/skills/skill-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-debug", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/nyldn/claude-octopus/tree/main/skills/skill-debug

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add nyldn/claude-octopus --skill skill-debug -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install nyldn/claude-octopus skill-debug --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/skill-debug .agents/skills/skill-debug && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "skill-debug" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-debug into .agents/skills/skill-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-debug", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nyldn/claude-octopus --skill skill-debug -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install nyldn/claude-octopus skill-debug --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/skill-debug .cursor/skills/skill-debug && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "skill-debug" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-debug into .cursor/skills/skill-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-debug", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/nyldn/claude-octopus.git --path skills/skill-debug

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add nyldn/claude-octopus --skill skill-debug -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install nyldn/claude-octopus skill-debug --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/skill-debug .gemini/skills/skill-debug && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "skill-debug" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-debug into .gemini/skills/skill-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-debug", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install nyldn/claude-octopus skill-debug

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add nyldn/claude-octopus --skill skill-debug -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/skill-debug .github/skills/skill-debug && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "skill-debug" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-debug into .github/skills/skill-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-debug", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add nyldn/claude-octopus --skill skill-debug -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install nyldn/claude-octopus skill-debug --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/nyldn/claude-octopus.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/skill-debug .opencode/skills/skill-debug && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "skill-debug" agent skill from https://github.com/nyldn/claude-octopus/tree/main/skills/skill-debug into .opencode/skills/skill-debug/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-debug", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: skill-debug
GitHub stars: 4.2k
Used in: 1 other repo
Token cost: ~1.3k tokens
SKILL.md length: 558 words
Files: 2
Skills in repo: 62
Repo updated: Oct 7, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Debug a reproducible symptom with a bounded feedback loop and original-scenario verification

Tasks that involve Debugging
SKILL.md covers Bounded recovery and strategy… and Scoped freeze guard
Calls python3

What it does

Skill Debug is an agent skill from nyldn/claude-octopus. Debug a reproducible symptom with a bounded feedback loop and original-scenario verification

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).

It sits in Development, covering Debugging. The repository describes itself as: Run multiple AI models against the same research, design, or coding task. Surface disagreements before you ship. The licence is MIT.

When your agent uses it

Tasks that involve Debugging

Example prompts

“/skill-debug”

Requirements

Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit 18b66ca. 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
Shell commands in SKILL.md call:
- python3
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

Skill Debug loads about 1.3k tokens when it runs. Until then it costs about 26 tokens; SKILL.md has 558 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~26
When it runs · the whole SKILL.md, loaded when a task matches: ~1.3k

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 nyldn/claude-octopus at commit 18b66ca, republished under its MIT licence (© nyldn). 558 words, ~1,345 tokens.

Download SKILL.mdSave it as .claude/skills/skill-debug/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: skill-debug
description: Debug a reproducible symptom with a bounded feedback loop and original-scenario verification
disable-model-invocation: true

Host: Codex CLI — This skill was designed for Claude Code and adapted for Codex. Cross-reference commands use installed skill names in Codex rather than /octo:* slash commands. Use the active Codex shell and subagent tools. Do not claim a provider, model, or host subagent is available until the current session exposes it. For host tool equivalents, see skills/blocks/codex-host-adapter.md.

Debugging

Read skills/blocks/engineering-method-selection.md from the installed plugin for review admission. Natural-language requests and --peer-review share that policy. Honor host-only requests; risk alone does not authorize paid usage.

Run the investigation on the current host. Routine debugging makes zero additional provider dispatches. Use a bounded external reviewer only for --peer-review, an explicit independent-review request, or an existing risk policy.

<HARD-GATE>
DO NOT CHANGE PRODUCTION BEHAVIOR BEFORE REPRODUCING THE SYMPTOM AND TESTING A
NAMED ROOT-CAUSE HYPOTHESIS.
</HARD-GATE>

Read and apply skills/blocks/debug-feedback-loop.md from the installed plugin root.

Start with the user's observable symptom. Reproduce it, retain its failure signature while minimizing the scenario, test one named hypothesis at a time, and verify both the minimal reproduction and the original scenario after the fix. Do not treat a nearby passing helper test as proof.

For a race, use a synchronization barrier and a fixed run or time budget. For an unavailable production dependency, return inconclusive with the missing evidence. Remove temporary instrumentation before completion and preserve a stable reproduction as a regression test.

The final record is data, not an executable queue. Store commands as argument arrays and never evaluate provider-authored text.

Bounded recovery and strategy rotation

Use a 3-Strike Rule for failed fixes. After each failure, return to the evidence and test a materially different hypothesis. After two consecutive failures, a strategy rotation is mandatory: reconsider the root cause, the reproduction, and whether the test encodes the intended behavior. Do not attempt a 4th fix without explicit user approval.

Anti-rationalization check: “Should work now” means run the reproduction and the original scenario. Confidence is not verification.

For multi-attempt debugging, report a WTF score using the defaults in ~/.claude-octopus/loop-config.conf: +15% per revert and +20% for touching unrelated files. If the score exceeds 20%, STOP and show the evidence before continuing. Include the score with every retry, for example:

text

Fix attempt 2 | Self-regulation: 15% (1 revert, 0 unrelated files)

Show full SKILL.md (196 more words)Show less

Scoped freeze guard

When the symptom is localized to one user-approved module, resolve that module to a physical directory before editing and activate the existing freeze guard:

bash

_OCTO_SESSION_ID="${CLAUDE_CODE_SESSION_ID:-${CLAUDE_SESSION_ID:-}}"
if [[ -z "$_OCTO_SESSION_ID" ]]; then
    printf 'Freeze activation requires a shared Claude session ID; stop before editing.\n' >&2
    exit 1
fi
freeze_dir="$(cd "<module-directory>" 2>/dev/null && pwd -P)" || exit 1
_OCTO_FREEZE_FILE="/tmp/octopus-freeze-${_OCTO_SESSION_ID}.txt"
if [[ -e "$_OCTO_FREEZE_FILE" || -L "$_OCTO_FREEZE_FILE" ]]; then
    if [[ -f "$_OCTO_FREEZE_FILE" && ! -L "$_OCTO_FREEZE_FILE" &&
          -O "$_OCTO_FREEZE_FILE" && -s "$_OCTO_FREEZE_FILE" ]]; then
        printf 'Freeze already active; left unchanged.\n'
    else
        printf 'Unsafe or empty freeze state; stop and inspect it before retrying.\n' >&2
        exit 1
    fi
else
    (umask 077; python3 - "$_OCTO_FREEZE_FILE" "$freeze_dir" <<'PYFREEZE'
import os
import sys

try:
    fd = os.open(sys.argv[1], os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0o600)
    with os.fdopen(fd, "w", encoding="utf-8") as state:
        state.write(sys.argv[2] + "\n")
except OSError:
    raise SystemExit("Freeze activation failed; inspect the state before retrying.")
PYFREEZE
    ) || exit 1
fi

Activation requires a nonempty CLAUDE_CODE_SESSION_ID or CLAUDE_SESSION_ID. Both activation and freeze enforcement require Python 3. Existing empty, symlinked or nonregular state is refused for manual inspection; active state contents are never read or printed by this activation check. Exclusive creation refuses a state path introduced after the check.

A freeze that is already active (from /octo:freeze, /octo:guard or an earlier workflow) stays as it is: do not replace it, and do not remove it when debugging ends. Its current boundary still blocks edits outside that scope. To target another module, consciously unfreeze and freeze the new scope before editing. Do not auto-freeze when the root cause is still unknown, the reproduction spans modules, or the user opted out. After original-scenario verification, run /octo:unfreeze only if this workflow created the freeze and the state file still names the directory it set; a different directory means the user froze again since, so leave that freeze in place.

Adapted from diagnosing-bugs in mattpocock/skills at commit 3cca18b368ae95cdbdebbff572ccafa662551015 under the MIT License. See THIRD_PARTY_NOTICES.md.

Files

SKILL.md and 1 other file in skills/skill-debug of nyldn/claude-octopus.

SKILL.md
agents/openai.yaml

Open the folder on GitHubat commit 18b66ca

Used in 1 other repository

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in nyldn/claude-octopus, which our catalogue first saw on October 7, 2026.

hashgraph-online/awesome-codex-pluginsplugins/nyldn/claude-octopus/skills/skill-debug

Compare with similar skills

Skill Debug 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.

Skill Debug compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Skill Debug this skillnyldn/claude-octopus	4.2k	1 repos	~1.3k	Automated safety check: Pass	MIT	today
Trellis Session Insightmindfold-ai/Trellis	15k	4 repos	~1.7k	Automated safety check: Pass	AGPL-3.0	8 days ago
Native Data FetchingCherryHQ/cherry-studio-app	4k	6 repos	~2.9k	Automated safety check: Notes	MIT	4 days ago
Aoti Debugpytorch/pytorch	104k	1 repos	~1.7k	Automated safety check: Pass	Custom licence	today
Herdr Throwaway Reproductionherdrdev/herdr	43k	—	~2.4k	Automated safety check: Pass	Apache-2.0	today
Systematic Debuggingultralisp/ultralisp	258	51 repos	~2.4k	Automated safety check: Pass	None	24 days ago

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Questions about Skill Debug

What does Skill Debug do?

Debug a reproducible symptom with a bounded feedback loop and original-scenario verification. Skill Debug is an agent skill from nyldn/claude-octopus.

When should I use Skill Debug?

Skill Debug fits situations like: tasks that involve Debugging.

How do I install Skill Debug in Claude Code?

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

How do I install Skill Debug in Codex?

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

Can I use Skill Debug 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 nyldn/claude-octopus --skill skill-debug -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skill-debug, .gemini/skills/skill-debug, .github/skills/skill-debug and .opencode/skills/skill-debug in your project.

What does Skill Debug need to run?

Going by SKILL.md and its folder, Skill Debug needs the command-line tools its instructions call (python3). Our summary lists: Python 3.

Does Skill Debug 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 Skill Debug 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 Skill Debug use?

Skill Debug 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 Skill Debug use?

About 1.3k tokens (SKILL.md is roughly 5.4k 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 Skill Debug?

Skills that share tags, products or a category with Skill Debug: Trellis Session Insight (mindfold-ai/Trellis, 15k stars), Native Data Fetching (CherryHQ/cherry-studio-app, 4k stars), Aoti Debug (pytorch/pytorch, 104k stars) and Herdr Throwaway Reproduction (herdrdev/herdr, 43k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Skill Debug?

nyldn (a GitHub user) maintains it in nyldn/claude-octopus, which has 4,173 GitHub stars. The repository holds 62 skills in this directory. The repository was last updated on October 7, 2026.

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

Skill Debug

Install Skill Debug

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Debugging

Bounded recovery and strategy rotation

Scoped freeze guard

Files

Used in 1 other repository

Compare with similar skills

Similar skills

Trellis Session Insight

Native Data Fetching

Aoti Debug

Herdr Throwaway Reproduction

Systematic Debugging

OpenLogi macOS Permissions Triage

More from nyldn/claude-octopus

Octopus Quick

Octopus Research

Octopus Security Audit

Skill Audit

Skill Content Pipeline

Skill Context Detection

Questions about Skill Debug

Install Skill Debug

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Debugging

Bounded recovery and strategy rotation

Scoped freeze guard

Files

Used in 1 other repository

Compare with similar skills

Similar skills

More from nyldn/claude-octopus

Related

Questions about Skill Debug