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rh-hemartin merged 1 commit into from
Jul 2, 2026
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docs(#2880): add sandbox image topology section to AGENTS.md #2881

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29 changes: 29 additions & 0 deletions AGENTS.md
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Expand Up @@ -105,6 +105,35 @@ These rules apply whenever you touch `docs/ADRs/` or review a PR that does. Full

When adding a new doc under `docs/`, check `website/.vitepress/config.ts` sidebar config. Sections using `getMarkdownFiles()` are auto-discovered. All other sections need a manual `{ text, link }` entry.

## Sandbox image topology

Fullsend agents run inside sandboxed containers. Two images exist in a
parent–child hierarchy; which image an agent uses depends on whether it
needs a compiled-language toolchain.

```
ghcr.io/nvidia/openshell-community/sandboxes/base (upstream)
└── fullsend-sandbox (base sandbox)
└── fullsend-code (extends base with Go)
```

| Image | Agents | Run frequency | Key additions over parent |
|-------|--------|---------------|--------------------------|
| `fullsend-sandbox` | triage, prioritize, retro | High (most agent runs) | Claude Code, jq, gitleaks, acli, pre-commit, gitlint, tirith, ProtectAI DeBERTa model |
| `fullsend-code` | code, fix, review | Lower (code/fix are the least-run agents; review runs per-PR) | Go toolchain, scan-secrets, gopls, lychee |

Harness definitions that map agents to images live in
`internal/scaffold/fullsend-repo/harness/*.yaml` (the `image:` field).
Image Containerfiles live in `images/sandbox/` and `images/code/`.
The CI build pipeline is `.github/workflows/sandbox-images.yml`.

**When reviewing CI changes:** If a PR modifies image pulling, caching,
or pre-warming logic in `action.yml`, consider which agent types are
affected. Changes that only benefit `fullsend-code` have a smaller blast
radius (fewer agent runs) than changes to `fullsend-sandbox`. A cache or
pull optimization may not be worth the complexity if it only helps the
least-frequently-run agents.

## Key design decisions made

- **Autonomy model:** Binary per-repo, with CODEOWNERS enforcing human approval on specific paths
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