system-prompt SKILL.md skillA
system-prompt from skillberry-ai/cap-evolve is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add skillberry-ai/cap-evolve/system-prompt@git:20261015.ac1f1f4Pins git:20261015.ac1f1f4 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- skillberry-ai/cap-evolve
- Path
skills/capabilities/system-prompt/SKILL.md- Versions recorded
- 7
- Latest version
- git:20261015.ac1f1f4, committed Oct 15, 2026
- First version recorded
- Jun 25, 2026
- Size
- 9,442 bytes
- Repository stars
- 66
- License
- Apache-2.0
Optimize an agent's system prompt, developer message, or policy text — the instructions that shape its behavior. Use when the artifact to improve is a prompt or policy file rather than tools or a skill package: the agent lacks a rule, misses the required output format, or applies the wrong decision criterion. Covers the safe edit classes (rewrite, consolidate, add a sourced rule, reorder, tighten the output contract, soften over-strong wording), how to keep an edit general instead of…
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
# Capability: system prompt This capability treats one or more prompt/policy text files (`prompt.txt`, `policy.md`, `SYSTEM.md`) as the optimizable artifact — whatever text the runtime prepends to the agent's context as its instructions, output contract, and decision policy. Prose is the right lever when the agent lacks something it could be *told*: a format, a rule, a decision criterion. It is the wrong lever when the agent already has the rule and does not act on it — that needs the behavior enforced in code, so it belongs to whatever capability edits the agent's tools, not here. Classify the failure clusters first (`./guidance/diagnose/SKILL.md`, when present) and spend prose only on the clusters this capability can actually move. ## Pick the lever Each item is an edit class. Aim each edit at the lever with the largest expected reward gain across the failure types in the traces, not at the one task you read; ship every class the traces call for in one candidate. Examples are 1-line and generic; depth is in [`references/concepts.md`](references/concepts.md). 1. **Rewrite a rule for clarity, positively framed** — say what TO do, specifically. …
Read the whole file at its exact version.
How to install
mdr add skillberry-ai/cap-evolve/system-prompt@sha256:4df6976688391b55The line at the top of this page pins the label git:20261015.ac1f1f4, 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_h5sevqrrsk4wpxe3)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 7 versions of this file, between Jun 25, 2026 and Oct 15, 2026, about one every 19 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261015.ac1f1f4 latest | 2026-10-15 | ac1f1f4 | 9,442 B | A | view · diff |
| git:20261008.03e3727 | 2026-10-08 | 03e3727 | 9,380 B | A | view · diff |
| git:20260822.8646f97 | 2026-08-22 | 8646f97 | 8,696 B | A | view · diff |
| git:20260629.037a270 | 2026-06-29 | 037a270 | 12,732 B | A | view · diff |
| git:20260629.8c0dac8 | 2026-06-29 | 8c0dac8 | 12,730 B | A | view · diff |
| git:20260629.88dc829 | 2026-06-29 | 88dc829 | 13,169 B | A | view · diff |
| git:20260625.085b6ad | 2026-06-25 | 085b6ad | 12,670 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 (9442 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
skillberry-ai/cap-evolve · 66 stars · license Apache-2.0 · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_h5sevqrrsk4wpxe3 GET https://markdownregistry.com/api/v1/resolve?ref=skillberry-ai/cap-evolve/system-prompt GET https://markdownregistry.com/api/v1/blob/4df6976688391b55e783b9cb6631523718c40a4ed4fbee77d71d450d105de51b
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.