agent-harness SKILL.md skillA
agent-harness from ssheleg/agent-stack is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ssheleg/agent-stack/agent-harness@git:20261028.52b0584Pins git:20261028.52b0584 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ssheleg/agent-stack
- Path
plugins/agent-stack/skills/agent-harness/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261028.52b0584, committed Oct 28, 2026
- First version recorded
- Oct 9, 2026
- Size
- 14,244 bytes
- Repository stars
- 4
- License
- MIT
Use when deciding an agent's system prompt and tools, not how its loop is wired: system prompt, tool choice, workflow or agent, harness audits. Triggers: "system prompt" / "системный промпт", "аудит агента". Not for the loop (agent-orchestrator), evals (agent-evals) or protocols (agent-interop).
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 — what the agent is told, and how to audit what someone else told theirs `agent-orchestrator` wires the loop. `agent-evals` proves it behaves. `agent-interop` gets it talking to other processes. **This skill is the layer between them and the model: the prompt, the tools, and the choice of technique.** Harness engineering includes context management as well as instructions. Its effect depends on the task, model and evaluation; benchmark gains do not establish a universal improvement. It runs in both directions. Building one and auditing one are the same checklist read forwards and backwards, which is why they live together here. --- ## Triggers "tool description", "agent loops forever", "prompt engineering", "harness engineering", "ReAct loop", "react pattern", "static or dynamic", "embed an agent", "agent SDK", "Pi harness", "встроить агента". Moved here from the description in 0.31.3: "agent picks the wrong tool", "агент не вызывает тул", "audit this agent". ## Rule zero — check the prompt first (a diagnostic heuristic, with exceptions) For failures in tool selection or usage, inspect instructions and descriptions …
Read the whole file at its exact version.
How to install
mdr add ssheleg/agent-stack/agent-harness@sha256:4b45a4114b5b37dfThe line at the top of this page pins the label git:20261028.52b0584, 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_niffaqxe7u2i5y34)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Oct 9, 2026 and Oct 28, 2026, about one every 5 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261028.52b0584 latest | 2026-10-28 | 52b0584 | 14,244 B | A | view · diff |
| git:20261025.28a0303 | 2026-10-25 | 28a0303 | 14,239 B | A | view · diff |
| git:20261020.672d5ff | 2026-10-20 | 672d5ff | 14,278 B | A | view · diff |
| git:20261012.96ed0f8 | 2026-10-12 | 96ed0f8 | 14,571 B | A | view · diff |
| git:20261009.b512cb4 | 2026-10-09 | b512cb4 | 14,596 B | A | 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 (14244 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
ssheleg/agent-stack · 4 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_niffaqxe7u2i5y34 GET https://markdownregistry.com/api/v1/resolve?ref=ssheleg/agent-stack/agent-harness GET https://markdownregistry.com/api/v1/blob/4b45a4114b5b37df33f745031a8f5a8e98e09ceb98f64bed0dbdbeb117bc25b7
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 ssheleg/agent-stack
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