agent-harness-design SKILL.md skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
agent-harness-design from yeaight7/agent-powerups is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add yeaight7/agent-powerups/agent-harness-design@git:20260606.362908dPins git:20260606.362908d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- yeaight7/agent-powerups
- Path
plugins/agentic-systems/skills/agent-harness-design/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260606.362908d, committed Jun 6, 2026
- First version recorded
- May 4, 2026
- Size
- 4,355 bytes
- Repository stars
- 8
- License
- Apache-2.0
Use when designing tool definitions for a new agent or subagent, an agent shows high retry rates, ambiguous tool invocations, or silent failures, or an existing agent harness needs a quality review.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Agent Harness Design
Use when designing or improving how an agent invokes tools, handles errors, and decides when to stop.
## When to Use
- Designing tool definitions for a new agent or subagent
- Observing high retry rates or ambiguous tool invocations
- Agent is failing silently or completing without verifying outcomes
- Reviewing an existing agent harness for quality issues
## Tool Design Rules
### Naming
- Use explicit, stable names: `read_file`, `run_tests`, `apply_patch`
- No generic names: `do_action`, `execute`, `handle`
- One tool per distinct operation; do not overload parameters to compensate
### Schema
Keep tool inputs narrow:
- Required fields only; no optional fields that change behavior
- Use enums for mode/type values — never free-text strings that require parsing
- Validate at the boundary; reject malformed input with a clear error, not a fallback
```json
{
"name": "run_tests",
"parameters": {
"path": { "type": "string", "description": "Path to test file or directory" },
"filter": { "type": "string", "description": "Optional test name filter" }
}
}
```
### Output Shape
Every tool response must include:
…Read the whole file at its exact version.
How to install
mdr add yeaight7/agent-powerups/agent-harness-design@sha256:459f694d55d46eebThe line at the top of this page pins the label git:20260606.362908d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_pqvklctdz5wqlf2p)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between May 4, 2026 and Jun 6, 2026, about one every 17 days. Its first recorded version is graded B and its latest A.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260606.362908d latest | 2026-06-06 | 362908d | 4,355 B | A | view · diff |
| git:20260504.69a23e0 | 2026-05-04 | 69a23e0 | 3,741 B | A | view · diff |
| git:20260504.c32c65b | 2026-05-04 | c32c65b | 70 B | B | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4355 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
yeaight7/agent-powerups · 8 stars · license Apache-2.0 · pushed 2026-09-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_pqvklctdz5wqlf2p GET https://markdownregistry.com/api/v1/resolve?ref=yeaight7/agent-powerups/agent-harness-design GET https://markdownregistry.com/api/v1/blob/459f694d55d46eeb9a11980385f6012e64602bc7b8c7123e22dacb4fde9232ed
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from yeaight7/agent-powerups
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