# williamhallatt > Open-source publisher. Listings imported from github.com/williamhallatt — credited to the original author with their license. - **Listings:** 23 - **Total installs:** 0 - **Profile:** https://agentstack.voostack.com/s/williamhallatt - **Website:** https://github.com/williamhallatt ## Published listings - [Internal Links Only Skill](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-internal-links-only-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-internal-links-only-skill` A test skill that links to internal files but provides no source citations. - [Cogworks](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-cogworks) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-cogworks` Start here — turn source material into a validated agent skill. Orchestrates cogworks-encode (synthesis) and cogworks-learn (skill generation). - [Cogworks Agentic](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-cogworks-agentic) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-cogworks-agentic` How Squad coordinates a cogworks agentic run on Copilot CLI using the task tool and role-profiles.json - [No Citations Test](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-no-citations-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-no-citations-skill` Test skill with no source citations for negative control testing - [Api Auth Smoke Copilot V2](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-skill-output) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-skill-output` Decision rules for HTTP authentication and authorization response codes, token lifecycle handling, and operator-facing guidance for API auth boundaries. - [Codex Prompt Engineering](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-codex-prompt-engineering) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-codex-prompt-engineering` Optimize Codex/GPT prompts for gpt-5.1, gpt-5.2, and gpt-5.2-codex with calibrated reasoning effort, autonomous execution patterns, correct tool contracts (apply_patch, exec_command, update_plan), compact outputs, evaluation flywheel loops, and production security controls. - [Missing Ref Sections Skill](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-missing-ref-sections-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-missing-ref-sections-skill` A minimal skill fixture for testing that a reference.md missing the Quick Reference section produces a warning. Use when testing check 21 of the deterministic validation suite. - [Product Gaps Cogworks](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-product-gaps-cogworks) — Skill · Free — `agentstack add skill-williamhallatt-cogworks-product-gaps-cogworks` Product gaps in cogworks pipeline identified through agent skills synthesis—what's missing, why it matters, and what done looks like for roadmap prioritization - [Test](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-bad-yaml-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-bad-yaml-skill` A Claude skill from williamhallatt/cogworks. - [Claude Prompt Engineering](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-claude-prompt-engineering) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-claude-prompt-engineering` Optimize Claude Code prompts for Opus 4.6, Sonnet 4.5, and Haiku 4.5 with model-aware reasoning settings, context control, safe tool use, and concise output shaping. - [My Skill V2](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-bad-name-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-bad-name-skill` Test skill with invalid name format containing uppercase letters, underscores, and dots - [Cogworks Learn](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-cogworks-learn) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-cogworks-learn` Generate and validate agent skill files (SKILL.md, reference.md, metadata). Enforces structural contracts, quality gates, and runtime compatibility. - [Supporting Citations Skill](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-supporting-citations-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-supporting-citations-skill` A test skill with proper source citations in supporting files. - [Cogworks Learn](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-expected-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-expected-skill` Expert knowledge on writing Claude Code skills - SKILL.md files, frontmatter configuration, invocation modes, context management, and best practices. Use when creating skills, designing slash commands, writing SKILL.md files, or optimizing skill discoverability and context efficiency. - [Cogworks Encode](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-cogworks-encode) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-cogworks-encode` Distill one or more sources into a decision-first knowledge base. Resolves conflicts, extracts cross-source relationships, and classifies trust. Not a summarizer or copy-editor. - [Missing Snapshot Date Skill](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-missing-snapshot-date-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-missing-snapshot-date-skill` A minimal skill fixture for testing that a reference.md without a snapshot date line produces a warning. Use when testing check 15 of the deterministic validation suite. - [Skill Evaluation](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-skill-evaluation) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-skill-evaluation` Guides systematic evaluation of Claude Code skills through eval-driven development, SMART success criteria, layered grading (deterministic then LLM-as-judge then human), four-category test datasets with negative controls, and observable behavior checks. Apply when designing skill tests, defining quality metrics, building test cases, grading skill outputs, choosing graders, calibrating LLM judges,… - [Missing Sections Skill](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-missing-sections-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-missing-sections-skill` A minimal skill fixture for testing that missing recommended SKILL.md sections produce a warning. Use when testing check 20 of the deterministic validation suite. - [Unclosed Fence Skill](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-unclosed-fence-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-unclosed-fence-skill` A minimal skill fixture with an unclosed code fence to trigger check 10 markdown syntax validation. Use when testing deterministic validation of markdown structure. - [Cogworks Learn](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-snapshot-cogworks-learn) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-snapshot-cogworks-learn` Use when creating or revising agent skills, including SKILL.md structure, frontmatter configuration, invocation modes, context management, quality gates, and discoverability optimization. - [Duplicate Headings Test](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-duplicate-headings-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-duplicate-headings-skill` Test skill with duplicate headings across supporting files for cross-file duplication check validation - [Forbidden Patterns Skill](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-forbidden-patterns-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-forbidden-patterns-skill` A minimal skill fixture containing a TODO marker to trigger check 6 forbidden pattern detection. Use when testing deterministic validation of forbidden patterns. - [Over Line Limit Skill](https://agentstack.voostack.com/l/skill-williamhallatt-cogworks-over-line-limit-skill) — Skill · Free · security-reviewed — `agentstack add skill-williamhallatt-cogworks-over-line-limit-skill` A skill fixture that exceeds the 500-line critical threshold to trigger check 4 line count validation. Use when testing deterministic validation of line count limits. --- Seller on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Install any with `agentstack add `.