Building Agents
ericrisco/rsc-harness
A skill your agent uses when building or restructuring an LLM agent — provider adapter, tool calling, structured output, RAG, agent loop, eval gate, cost routing, tracing, MCP server —…
Designing agent harnesses and tool systems — risk taxonomy for tools, permission decisions, draft/commit pattern, structured tool results, agent budgets (10 types), context trust labels against…
Install Agent Harness Design
$ npx skills add AnastasiyaW/codex-claude-code-config --skill agent-harness-design -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install AnastasiyaW/codex-claude-code-config agent-harness-design --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/AnastasiyaW/codex-claude-code-config.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/agent-harness-design .claude/skills/agent-harness-design && rm -rf skills-srcUse ~/.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/
Install the "agent-harness-design" agent skill from https://github.com/AnastasiyaW/codex-claude-code-config/tree/main/skills/agent-harness-design into .claude/skills/agent-harness-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-harness-design", 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 install https://github.com/AnastasiyaW/codex-claude-code-config/tree/main/skills/agent-harness-designType 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.
$ npx skills add AnastasiyaW/codex-claude-code-config --skill agent-harness-design -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install AnastasiyaW/codex-claude-code-config agent-harness-design --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/AnastasiyaW/codex-claude-code-config.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/agent-harness-design .agents/skills/agent-harness-design && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "agent-harness-design" agent skill from https://github.com/AnastasiyaW/codex-claude-code-config/tree/main/skills/agent-harness-design into .agents/skills/agent-harness-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-harness-design", 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.
$ npx skills add AnastasiyaW/codex-claude-code-config --skill agent-harness-design -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install AnastasiyaW/codex-claude-code-config agent-harness-design --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/AnastasiyaW/codex-claude-code-config.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/agent-harness-design .cursor/skills/agent-harness-design && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "agent-harness-design" agent skill from https://github.com/AnastasiyaW/codex-claude-code-config/tree/main/skills/agent-harness-design into .cursor/skills/agent-harness-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-harness-design", 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 https://github.com/AnastasiyaW/codex-claude-code-config.git --path skills/agent-harness-design--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add AnastasiyaW/codex-claude-code-config --skill agent-harness-design -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install AnastasiyaW/codex-claude-code-config agent-harness-design --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/AnastasiyaW/codex-claude-code-config.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/agent-harness-design .gemini/skills/agent-harness-design && rm -rf skills-srcUse ~/.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/
Install the "agent-harness-design" agent skill from https://github.com/AnastasiyaW/codex-claude-code-config/tree/main/skills/agent-harness-design into .gemini/skills/agent-harness-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-harness-design", 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.
$ gh skill install AnastasiyaW/codex-claude-code-config agent-harness-designInstalls 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).
$ npx skills add AnastasiyaW/codex-claude-code-config --skill agent-harness-design -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/AnastasiyaW/codex-claude-code-config.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/agent-harness-design .github/skills/agent-harness-design && rm -rf skills-srcUse ~/.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/
Install the "agent-harness-design" agent skill from https://github.com/AnastasiyaW/codex-claude-code-config/tree/main/skills/agent-harness-design into .github/skills/agent-harness-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-harness-design", 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.
$ npx skills add AnastasiyaW/codex-claude-code-config --skill agent-harness-design -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install AnastasiyaW/codex-claude-code-config agent-harness-design --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/AnastasiyaW/codex-claude-code-config.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/agent-harness-design .opencode/skills/agent-harness-design && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "agent-harness-design" agent skill from https://github.com/AnastasiyaW/codex-claude-code-config/tree/main/skills/agent-harness-design into .opencode/skills/agent-harness-design/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "agent-harness-design", 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
agent-harness-design- GitHub stars
- 154
- Token cost
- ~764 tokens
- SKILL.md length
- 216 words
- Files
- 12 (incl. references)
- Skills in repo
- 50
- Repo updated
- First seen
- Licence
- MIT
At a glance
Designing agent harnesses and tool systems — risk taxonomy for tools, permission decisions, draft/commit pattern, structured tool results, agent budgets (10 types), context trust labels against…
- Building a new Agent SDK app
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Custom orchestrator
- Cloudflare Worker with tool calls
What it does
Agent Harness Design is an agent skill from AnastasiyaW/codex-claude-code-config. Designing agent harnesses and tool systems — risk taxonomy for tools, permission decisions, draft/commit pattern, structured tool results, agent budgets (10 types), context trust labels against prompt injection, plan-artifact, approval records, observability and traces, evals (13 categories), event model, streaming buffering, 3rd-party skill install checklist, agentic RAG, self-improving SOP loops, model policy, reasoning effort, and Programmatic Tool Calling adoption gates. Use when building a new Agent SDK app…
Its SKILL.md is about 760 tokens, which your agent loads only when the skill is triggered. The skill folder holds 12 other files, including reference files (for example `references/agent-approval-records.md`, `references/agent-budgets.md` and `references/agent-evals.md`).
It sits in AI & LLM Engineering, covering Autonomous loops, LLM evaluation and Structured output and tool calling. It works with Model Context Protocol and Cloudflare Workers. The repository describes itself as: Claude Code, Codex, and multi-agent configuration system: principles, hooks, skills, and workflow patterns for AI-assisted development. The licence is MIT.
When your agent uses it
- Building a new Agent SDK app
- Custom orchestrator
- Cloudflare Worker with tool calls
- Agentic RAG pipeline
Example prompts
- “/agent-harness-design”
What it can do on your machine
Read from SKILL.md and the folder at commit 67709af. 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.
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
Agent Harness Design loads about 764 tokens when it runs, and up to ~26k if it reads all its reference files. Until then it costs about 241 tokens; SKILL.md has 216 words of instructions outside code blocks.
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 AnastasiyaW/codex-claude-code-config at commit 67709af, republished under its MIT licence (© AnastasiyaW). 216 words, ~764 tokens.
Download SKILL.mdSave it as
.claude/skills/agent-harness-design/SKILL.md (or your agent's skills folder). This skill also uses 11 other files; get the full folder from GitHub.- name
- agent-harness-design
- description
- Designing agent harnesses and tool systems — risk taxonomy for tools, permission decisions, draft/commit pattern, structured tool results, agent budgets (10 types), context trust labels against prompt injection, plan-artifact, approval records, observability and traces, evals (13 categories), event model, streaming buffering, 3rd-party skill install checklist, agentic RAG, self-improving SOP loops, model policy, reasoning effort, and Programmatic Tool Calling adoption gates. Use when building a new Agent SDK app, custom orchestrator, MCP server, Cloudflare Worker with tool calls, agentic RAG pipeline, model router, or model-tier policy; when designing tools and permissions; when writing an agent loop; or when you need trust labels for external content. Do NOT use for improving or auditing an already-built harness (use harness-audit / harness-design instead), nor for ordinary Claude Code sessions where the harness is already given.
Agent Harness Design
Eleven operational reference sheets for designing a safe, observable agent harness. They are situational — load only the one(s) relevant to the current task from references/ (this is why they live in a skill rather than always-on rules: building an agent harness is occasional, so the detail should not bloat every session's context).
references/agent-tool-design.md— 15-class risk taxonomy, 7-type permission decision object, draft/commit naming, structured tool results, deferred tool loading, hosted vs client tools, connector code-execution pattern.references/context-trust-labels.md— trusted / semi_trusted / untrusted labels + verbatim boundary statement; prompt-injection defense.references/agent-budgets.md— 10 mandatory budget types every agent loop must declare.references/agent-evals.md— 13 eval categories + 13 adversarial test cases + when to add regression evals.references/agent-observability.md— 16 trace fields per model call, 7-question audit, 6-step incident response.references/agentic-rag-model-policy.md— self-improving agentic RAG state, specialist roles, evaluation vectors, Pareto selection, OpenAI model/effort policy, and Programmatic Tool Calling adoption gates.references/agent-plan-artifact.md— planning mode, plan artifact format (10 fields), plan-validate-execute.references/agent-approval-records.md— approval request/result JSON schemas, scope/expiration, no self-approval.references/agent-streaming.md— buffering for incremental tool calls when stream=True; abort handling; output guardrail modes.references/agent-event-model.md— 13 typed events for harness state persistence (replay/audit/compaction/evals).references/agent-skill-install-checklist.md— pre/during/post install + audit + incident response for 3rd-party skills.
Source: distilled from the agents-best-practices skill (Denis Sergeevitch, MIT) + Anthropic harness-design engineering. Read the specific reference before applying — do not work from this index alone.
© AnastasiyaW, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 11 other files (references) in skills/agent-harness-design of AnastasiyaW/codex-claude-code-config.
- SKILL.md
- references/agent-approval-records.md
- references/agent-budgets.md
- references/agent-evals.md
- references/agent-event-model.md
- references/agent-observability.md
- references/agent-plan-artifact.md
- references/agent-skill-install-checklist.md
- references/agent-streaming.md
- references/agent-tool-design.md
- references/agentic-rag-model-policy.md
- references/context-trust-labels.md
Open the folder on GitHubat commit 67709af
Compare with similar skills
Agent Harness Design 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 | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Agent Harness Design this skillAnastasiyaW/codex-claude-code-config | 154 | — | ~764 | Automated safety check: Pass | MIT | |
| Building Agentsericrisco/rsc-harness | 180 | — | ~5k | Automated safety check: Pass | MIT | |
| Building Agent Systemstelagod/code-abyss | 244 | — | ~691 | Automated safety check: Pass | MIT | |
| LangchainOrchestra-Research/AI-Research-SKILLs | 13k | 2 repos | ~3.2k | Automated safety check: Pass | MIT | |
| Agentsop HTTP Tool Wrappingagentsope/SkillAlchemy | 436 | — | ~5.9k | Automated safety check: Pass | MIT | |
| Agent Evalericrisco/rsc-harness | 190 | — | ~3.2k | Automated safety check: Pass | MIT |
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Related
Works with
Categories
Questions about Agent Harness Design
What does Agent Harness Design do?
Designing agent harnesses and tool systems — risk taxonomy for tools, permission decisions, draft/commit pattern, structured tool results, agent budgets (10 types), context trust labels against…. Agent Harness Design is an agent skill from AnastasiyaW/codex-claude-code-config. Designing agent harnesses and tool systems — risk taxonomy for tools, permission decisions, draft/commit pattern, structured tool results, agent budgets (10 types), context trust labels against prompt injection, plan-artifact, approval records, observability and traces, evals (13 categories), event model, streaming buffering, 3rd-party skill install checklist, agentic RAG, self-improving SOP loops, model policy, reasoning effort, and Programmatic Tool Calling adoption gates.
When should I use Agent Harness Design?
Agent Harness Design fits situations like: building a new Agent SDK app; custom orchestrator; cloudflare Worker with tool calls; agentic RAG pipeline.
How do I install Agent Harness Design in Claude Code?
Run `npx skills add AnastasiyaW/codex-claude-code-config --skill agent-harness-design -a claude-code`. Or copy the skill folder (skills/agent-harness-design in AnastasiyaW/codex-claude-code-config) into .claude/skills/agent-harness-design in your project. Claude Code loads it when a task matches its description.
How do I install Agent Harness Design in Codex?
Run `npx skills add AnastasiyaW/codex-claude-code-config --skill agent-harness-design -a codex`. Or copy the skill folder (skills/agent-harness-design in AnastasiyaW/codex-claude-code-config) into .agents/skills/agent-harness-design in your project. Codex loads it when a task matches its description.
Can I use Agent Harness Design 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 AnastasiyaW/codex-claude-code-config --skill agent-harness-design -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/agent-harness-design, .gemini/skills/agent-harness-design, .github/skills/agent-harness-design and .opencode/skills/agent-harness-design in your project.
What does Agent Harness Design need to run?
SKILL.md names no scripts, command-line tools or credentials: Agent Harness Design is instructions for the agent only.
Does Agent Harness Design 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 Agent Harness Design 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 Agent Harness Design use?
Agent Harness Design 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 Agent Harness Design use?
About 764 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 25k tokens, read only when the agent opens those files.
What are the alternatives to Agent Harness Design?
Skills that share tags, products or a category with Agent Harness Design: Building Agents (ericrisco/rsc-harness, 180 stars), Building Agent Systems (telagod/code-abyss, 244 stars), Langchain (Orchestra-Research/AI-Research-SKILLs, 13k stars) and Agentsop HTTP Tool Wrapping (agentsope/SkillAlchemy, 436 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Agent Harness Design?
AnastasiyaW (a GitHub user) maintains it in AnastasiyaW/codex-claude-code-config, which has 154 GitHub stars. The repository holds 50 skills in this directory. The repository was last updated on October 9, 2026.
Source: AnastasiyaW/codex-claude-code-config on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.