docker-sandbox

Create, manage, and execute agent tools (claude, codex) inside Docker sandboxes for isolated code execution. Use when running agent loops, spawning tool subprocesses, or any task requiring process isolation. Triggers on "sandbox", "isolated execution", "docker sandbox", "safe agent execution", or when working on agent loop infrastructure.

3.22x

Quality

83%

Does it follow best practices?

Impact

100%

3.22x

Average score across 3 eval scenarios

Securityby

High

Do not use without reviewing

Quality

Content

72%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The content is highly actionable and mostly concise, with executable commands and clear sectioning. Its main weaknesses are the absence of an explicit validation checkpoint in the batch loop workflow and a lack of progressive disclosure into separate reference files.

Suggestions

Add an explicit validation checkpoint in the pre-warm workflow (e.g., verify each sandbox exists and `claude auth status`/codex auth succeeds before running the first story) to lift workflow clarity above the batch-operation cap of 3.

Move time-sensitive version pins (tool versions, Docker Desktop 4.40+, sandbox v0.11.0+) into a single Prerequisites table or a version-matrix section so they can be updated in one place and don't pad inline prose.

Split the "Implementation in utils.ts" detail and/or the per-tool auth setup into one-level-deep reference files (e.g. IMPLEMENTATION.md, AUTH.md) referenced from the Quick Reference, to improve progressive disclosure.

Dimension	Reasoning	Score
Conciseness	The body is mostly lean commands and tables that assume Claude knows Docker/git/secrets, but scattered version pins ("claude 2.1.42", "codex 0.101.0", "Docker Desktop 4.40+") are time-sensitive and not isolated in a deprecated section, a minor trim opportunity.	4 / 5
Actionability	Copy-paste-ready bash commands cover the common cases (create/exec/ls/rm, Claude and Codex auth injection, network proxy, host fallback, troubleshooting), with executable heredocs and lease commands throughout.	5 / 5
Workflow Clarity	The pre-warm loop lifecycle (PLANNER create+inject -> per-story exec -> COMPLETE/CANCEL rm) is clearly sequenced, but the batch/destructive loop workflow lacks an explicit verification checkpoint before story execution; validation exists only implicitly via the auth-status check and troubleshooting, capping at 3 per the batch-operation guideline.	3 / 5
Progressive Disclosure	Sections are well-organized with clear headers, tables, and a Quick Reference, but the ~230-line file is monolithic with no bundle reference files; content like the utils.ts implementation detail and full auth procedures is inlined rather than split into one-level-deep references.	3 / 5
	Total	15 / 20 Passed

Description

95%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is strong: it concisely states concrete capabilities, provides explicit and comprehensive trigger phrases, answers both what and when, and occupies a clear niche. The only minor weakness is the slightly generic verb "manage".

Dimension	Reasoning	Score
Specificity	"Create, manage, and execute agent tools (claude, codex) inside Docker sandboxes" lists several concrete actions, but "manage" is somewhat generic, leaving minor coverage gaps versus the comprehensive 5 anchor.	4 / 5
Completeness	It clearly states what ("Create, manage, and execute agent tools ... inside Docker sandboxes for isolated code execution") and when ("Use when running agent loops, spawning tool subprocesses, or any task requiring process isolation"), matching the explicit what-and-when 5 anchor.	5 / 5
Trigger Term Quality	Explicit trigger phrases "sandbox", "isolated execution", "docker sandbox", "safe agent execution", and "agent loop infrastructure" provide comprehensive coverage of natural synonyms users would actually say.	5 / 5
Distinctiveness Conflict Risk	The niche of Docker-sandboxed claude/codex agent execution with distinct triggers ("docker sandbox", "agent loop infrastructure") is clearly bounded with minimal overlap risk against other skills.	5 / 5
	Total	19 / 20 Passed

Validation

93%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 15 / 16 Passed

Validation for skill structure

Criteria	Description	Result
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	15 / 16 Passed

Repository: joelhooks/joelclaw
Path: skills/docker-sandbox/SKILL.md
Commit: d952451

Reviewed: 4 days ago

Table of Contents

Discovery Implementation Validation

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