building-agents SKILL.md skillA
building-agents from ericrisco/rsc-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ericrisco/rsc-harness/building-agents@git:20260729.3ecb845Pins git:20260729.3ecb845 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ericrisco/rsc-harness
- Path
skills/building-agents/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260729.3ecb845, committed Jul 29, 2026
- First version recorded
- Jun 2, 2026
- Size
- 19,908 bytes
- Repository stars
- 236
- License
- MIT
Use when building or restructuring an LLM agent — provider adapter, tool calling, structured output, RAG, agent loop, eval gate, cost routing, tracing, MCP server — model-agnostic across OpenAI/Anthropic/Gemini/OSS so a model swap is a config change. NOT vector-store SQL alone (that is `postgresdb`) or service deployment (that is `deployment`).
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
# Building production LLM agents (model-agnostic) A thin provider adapter, a disciplined agent loop, schema-validated tools, provider-neutral RAG, eval gates, OTel tracing, and optionally an MCP server — so swapping OpenAI ↔ Anthropic ↔ Gemini ↔ OSS is a config change, not a rewrite. ## The one rule > Program against a **capability interface**, never a vendor SDK. Vendor specifics (model id, tool-schema shape, JSON mode, caching, token limits) live behind one adapter resolved from config. Model names and prices rot — if one appears in business logic it's a bug, and re-verify the dated tables before quoting a number. **Hand off instead when:** a new non-trivial feature has no approved spec + plan under `02-DOCS/wiki/sdd/` → stop and run [`specify`](../specify/SKILL.md) first (method: [`sdd`](../sdd/SKILL.md)), which routes back here once the plan is approved; one-line/low-risk changes go straight through. Anthropic-SDK internals (caching, thinking, batch) in a file that *only* imports `anthropic` → `claude-api` if your environment has it, since this skill stays multi-provider. Workspace scaffolding → [`harness`](../harness/SKILL.md). Choosing *which* coding agent to use →… …
Read the whole file at its exact version.
How to install
mdr add ericrisco/rsc-harness/building-agents@sha256:5ec1322e94e35376The line at the top of this page pins the label git:20260729.3ecb845, 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_zjvgiblat4b4rqws)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Jun 2, 2026 and Jul 29, 2026, about one every 14 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.3ecb845 latest | 2026-07-29 | 3ecb845 | 19,908 B | A | view · diff |
| git:20260628.e37ed23 | 2026-06-28 | e37ed23 | 25,032 B | A | view · diff |
| git:20260615.5ea6bc3 | 2026-06-15 | 5ea6bc3 | 24,774 B | A | view · diff |
| git:20260610.c7292cf | 2026-06-10 | c7292cf | 24,753 B | A | view · diff |
| git:20260602.d5545f4 | 2026-06-02 | d5545f4 | 24,261 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 (19908 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
ericrisco/rsc-harness · 236 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_zjvgiblat4b4rqws GET https://markdownregistry.com/api/v1/resolve?ref=ericrisco/rsc-harness/building-agents GET https://markdownregistry.com/api/v1/blob/5ec1322e94e353765cc608d503488357555198e1e3f4d282e0d2c70f8c5a3815
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.