Harness Engineering
10xChengTu/harness-engineering
Set up and improve harness engineering (AGENTS.md, docs/, lint rules, eval systems, project-level prompt engineering) for AI-agent-friendly codebases.
Create or audit ECL Agent Harness infrastructure: AGENTS.md, change tracking, repository guidance, lint checks, CI gates, and agent handoff docs.
Install Ecl Harness Engineer
$ npx skills add sickn33/agentic-awesome-skills --skill ecl-harness-engineer -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install sickn33/agentic-awesome-skills ecl-harness-engineer --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/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/ecl-harness-engineer .claude/skills/ecl-harness-engineer && 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 "ecl-harness-engineer" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/ecl-harness-engineer into .claude/skills/ecl-harness-engineer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ecl-harness-engineer", 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/sickn33/agentic-awesome-skills/tree/main/skills/ecl-harness-engineerType 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 sickn33/agentic-awesome-skills --skill ecl-harness-engineer -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install sickn33/agentic-awesome-skills ecl-harness-engineer --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/ecl-harness-engineer .agents/skills/ecl-harness-engineer && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "ecl-harness-engineer" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/ecl-harness-engineer into .agents/skills/ecl-harness-engineer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ecl-harness-engineer", 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 sickn33/agentic-awesome-skills --skill ecl-harness-engineer -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install sickn33/agentic-awesome-skills ecl-harness-engineer --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/ecl-harness-engineer .cursor/skills/ecl-harness-engineer && 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 "ecl-harness-engineer" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/ecl-harness-engineer into .cursor/skills/ecl-harness-engineer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ecl-harness-engineer", 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/sickn33/agentic-awesome-skills.git --path skills/ecl-harness-engineer--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 sickn33/agentic-awesome-skills --skill ecl-harness-engineer -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install sickn33/agentic-awesome-skills ecl-harness-engineer --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/ecl-harness-engineer .gemini/skills/ecl-harness-engineer && 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 "ecl-harness-engineer" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/ecl-harness-engineer into .gemini/skills/ecl-harness-engineer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ecl-harness-engineer", 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 sickn33/agentic-awesome-skills ecl-harness-engineerInstalls 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 sickn33/agentic-awesome-skills --skill ecl-harness-engineer -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/ecl-harness-engineer .github/skills/ecl-harness-engineer && 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 "ecl-harness-engineer" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/ecl-harness-engineer into .github/skills/ecl-harness-engineer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ecl-harness-engineer", 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 sickn33/agentic-awesome-skills --skill ecl-harness-engineer -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install sickn33/agentic-awesome-skills ecl-harness-engineer --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/ecl-harness-engineer .opencode/skills/ecl-harness-engineer && 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 "ecl-harness-engineer" agent skill from https://github.com/sickn33/agentic-awesome-skills/tree/main/skills/ecl-harness-engineer into .opencode/skills/ecl-harness-engineer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ecl-harness-engineer", 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
ecl-harness-engineer- GitHub stars
- 47k
- Used in
- 1 other repo
- Token cost
- ~623 tokens
- SKILL.md length
- 257 words
- Files
- 29 (incl. references)
- Skills in repo
- 1,354
- Repo updated
- First seen
- Licence
- MIT
At a glance
Create or audit ECL Agent Harness infrastructure: AGENTS.md, change tracking, repository guidance, lint checks, CI gates, and agent handoff docs.
- Tasks that involve Linting and formatting
- SKILL.md covers Detailed Guide, When to Use This Skill and Limitations
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Tasks that involve Multi-agent orchestration
What it does
Ecl Harness Engineer is an agent skill from sickn33/agentic-awesome-skills. Create or audit ECL Agent Harness infrastructure: AGENTS.md, change tracking, repository guidance, lint checks, CI gates, and agent handoff docs.
Its SKILL.md is about 620 tokens, which your agent loads only when the skill is triggered. The skill folder holds 31 other files, including reference files (for example `agents/analyzer.md`, `agents/auditor.md` and `agents/creator-config.md`).
It sits in Agent Workflows, covering Linting and formatting, Multi-agent orchestration and Agent instruction files. The repository describes itself as: AAS Core is the local, agent-first control plane for complete catalog discovery, agent-owned selection, stack validation, and planning, backed by 2,400+ agentic skills. Includes… The licence is MIT.
When your agent uses it
- Tasks that involve Linting and formatting
- Tasks that involve Multi-agent orchestration
- Tasks that involve Agent instruction files
Example prompts
- “/ecl-harness-engineer”
What it can do on your machine
Read from SKILL.md and the folder at commit ec02547. 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
Ecl Harness Engineer loads about 623 tokens when it runs, and up to ~89k if it reads all its reference files. Until then it costs about 42 tokens; SKILL.md has 257 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 sickn33/agentic-awesome-skills at commit ec02547, republished under its MIT licence (© sickn33). 257 words, ~623 tokens.
Download SKILL.mdSave it as
.claude/skills/ecl-harness-engineer/SKILL.md (or your agent's skills folder). This skill also uses 28 other files; get the full folder from GitHub.- name
- ecl-harness-engineer
- description
- Create or audit ECL Agent Harness infrastructure: AGENTS.md, change tracking, repository guidance, lint checks, CI gates, and agent handoff docs.
- category
- development
- risk
- safe
- source
- community
- source_repo
- qinghui316/ecl-harness-engineer
- source_type
- community
- date_added
- 2026-06-13
- author
- qinghui316
- tags
- codex, agent-harness, ecl, workflow, ci
- tools
- codex, claude, cursor, gemini, antigravity
- license
- MIT
ECL Harness Engineer
Design and create Harness Engineering infrastructure so AI agents can work reliably in a codebase.
Core Philosophy: "Intelligence without infrastructure is just a demo." The Agent Harness is the Operating System — the LLM is just the CPU. The repository becomes the single source of truth — if an agent can't see it in context, it doesn't exist.
Detailed Guide
Read the detailed guide before executing this skill. It retains the complete procedure and reference material. Treat its safety, prerequisites, and validation requirements as mandatory. For focused work, load the relevant sections; for end-to-end work, read the guide completely.
When to Use This Skill
- Use when a repository needs AI-agent collaboration infrastructure such as
AGENTS.md,docs/ECL.md,docs/STATUS.md, harness change tracking, or mechanical validation gates. - Use when auditing an existing Agent Harness for missing ECL lifecycle docs, change templates, lint checks, environment contracts, or CI integration.
- Use when converting repeated agent workflow failures into repository-local documentation, tests, lint rules, or lightweight auto-evolution checks.
- Do not use for ordinary business feature implementation unless the requested work is specifically about creating or improving the repository harness.
Limitations
- This skill creates or audits harness infrastructure; it does not replace product requirements, implementation planning, code review, or release approval for the target project.
- The generated ECL docs, linters, scripts, and CI examples must be adapted to the repository's actual stack, security model, and existing contributor workflow before enforcement.
- Auto-evolve recommendations are guidance only. Apply harness changes through normal review, validation, and rollback discipline instead of accepting them as autonomous policy changes.
© sickn33, 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 28 other files (references) in skills/ecl-harness-engineer of sickn33/agentic-awesome-skills.
- SKILL.md
- LICENSE
- agents/analyzer.md
- agents/auditor.md
- agents/creator-config.md
- agents/creator-docs.md
- agents/creator-linters.md
- references/adapters/adapter-schema.md
- references/adapters/generic.md
- references/adapters/go.md
- references/adapters/java.md
- references/adapters/python.md
- references/adapters/rust.md
- references/adapters/typescript.md
- references/architecture-diagrams.md
- references/audit-templates.md
- references/capability-registry.md
- references/darwin-eval-prompts.md
- … and 11 more
Open the folder on GitHubat commit ec02547
Used in 1 other repository
We found 5 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in sickn33/agentic-awesome-skills, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Ecl Harness Engineer 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 |
|---|---|---|---|---|---|---|
| Ecl Harness Engineer this skillsickn33/agentic-awesome-skills | 47k | 1 repos | ~623 | Automated safety check: Pass | MIT | |
| Harness Engineering10xChengTu/harness-engineering | 102 | 1 repos | ~1k | Automated safety check: Pass | None | |
| Harness Agent Team Designerrevfactory/harness | 9.1k | — | ~4.5k | Automated safety check: Pass | Apache-2.0 | |
| Harness Evolution Feedback Looprevfactory/harness | 9.1k | — | ~855 | Automated safety check: Pass | Apache-2.0 | |
| Agnixagent-sh/agnix | 445 | — | ~874 | Automated safety check: Pass | Apache-2.0 | |
| Analyze Codebasedivar-ir/ai-doc-gen | 766 | — | ~899 | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Ecl Harness Engineer
What does Ecl Harness Engineer do?
Create or audit ECL Agent Harness infrastructure: AGENTS.md, change tracking, repository guidance, lint checks, CI gates, and agent handoff docs. Ecl Harness Engineer is an agent skill from sickn33/agentic-awesome-skills.md, change tracking, repository guidance, lint checks, CI gates, and agent handoff docs.
When should I use Ecl Harness Engineer?
Ecl Harness Engineer fits situations like: tasks that involve Linting and formatting; tasks that involve Multi-agent orchestration; tasks that involve Agent instruction files.
How do I install Ecl Harness Engineer in Claude Code?
Run `npx skills add sickn33/agentic-awesome-skills --skill ecl-harness-engineer -a claude-code`. Or copy the skill folder (skills/ecl-harness-engineer in sickn33/agentic-awesome-skills) into .claude/skills/ecl-harness-engineer in your project. Claude Code loads it when a task matches its description.
How do I install Ecl Harness Engineer in Codex?
Run `npx skills add sickn33/agentic-awesome-skills --skill ecl-harness-engineer -a codex`. Or copy the skill folder (skills/ecl-harness-engineer in sickn33/agentic-awesome-skills) into .agents/skills/ecl-harness-engineer in your project. Codex loads it when a task matches its description.
Can I use Ecl Harness Engineer 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 sickn33/agentic-awesome-skills --skill ecl-harness-engineer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ecl-harness-engineer, .gemini/skills/ecl-harness-engineer, .github/skills/ecl-harness-engineer and .opencode/skills/ecl-harness-engineer in your project.
What does Ecl Harness Engineer need to run?
SKILL.md names no scripts, command-line tools or credentials: Ecl Harness Engineer is instructions for the agent only.
Does Ecl Harness Engineer 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 Ecl Harness Engineer 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 Ecl Harness Engineer use?
Ecl Harness Engineer is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Ecl Harness Engineer use?
About 623 tokens (SKILL.md is roughly 2.5k 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 88k tokens, read only when the agent opens those files.
What are the alternatives to Ecl Harness Engineer?
Skills that share tags, products or a category with Ecl Harness Engineer: Harness Engineering (10xChengTu/harness-engineering, 102 stars), Harness Agent Team Designer (revfactory/harness, 9.1k stars), Harness Evolution Feedback Loop (revfactory/harness, 9.1k stars) and Agnix (agent-sh/agnix, 445 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Ecl Harness Engineer?
sickn33 (a GitHub user) maintains it in sickn33/agentic-awesome-skills, which has 47,343 GitHub stars. The repository holds 1,354 skills in this directory. The repository was last updated on October 7, 2026.
Source: sickn33/agentic-awesome-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.