fabro/docs/public/api-reference
fabro-sh-0530[bot] 2c0416e1c5
feat: add server sandbox provider enablement policy (#389)
Operators can now disable individual sandbox providers at the server
level via `[server.sandbox.providers.<provider>]` in `settings.toml`,
without breaking existing deployments that omit the section entirely.

## What changed

**Config layer & resolution** (`fabro-config`, `fabro-types`): new
sparse `ServerSandboxLayer` / `ServerSandboxProvidersLayer` /
`ServerSandboxProviderLayer` structs with `deny_unknown_fields` parse
validation. Resolution defaults every missing level to `enabled = true`.
The resolved `ServerSandboxSettings` / `ServerSandboxProvidersSettings`
/ `ServerSandboxProviderSettings` types live in `fabro-types` and are
shared by all consumers.

**Policy enforcement** (`fabro-server`): three check points enforce the
effective provider (after dry-run Local coercion):
1. `POST /api/v1/runs` — 400 at admission.
2. `POST /api/v1/runs/preflight` — `ok: false` with a `Sandbox Provider
Policy` error check.
3. Launch (`execute_run_in_process` / `execute_run_subprocess`) —
fail-before-execution with a `LaunchFailed` reason.

The dry-run coercion logic was extracted into
`SandboxProvider::effective_for(mode)` on the type itself and reused
across `fabro-server` and `fabro-workflow`.

**Installer** (`fabro-install`): `write_sandbox_settings` now always
writes all three provider policy tables with `enabled = true`, so
generated `settings.toml` files are self-documenting.

**API schema & clients**: `ServerNamespace` gains a required `sandbox`
field in the OpenAPI spec; three new TypeScript model files were
regenerated accordingly.

### Plan Summary
- Task 1: config layer structs → resolved types → resolver helpers →
tests
- Task 2: `effective_sandbox_provider` + `sandbox_provider_policy_error`
helpers; admission, preflight, and launch checks + integration tests
- Task 3: installer writes all three provider entries; install finish
tests updated
- Task 4: OpenAPI schema, `fabro-api` build mappings, TS client
regeneration, docs


### Fabro Details

<details>
<summary>Ran 8 stages in 59m 15s for $45.70</summary>

| Stage | Duration | Cost | Retries |
|---|---|---|---|
| start | 0s | – | 0 |
| toolchain | 1s | – | 0 |
| preflight_compile | 2m 5s | – | 0 |
| preflight_lint | 2m 21s | – | 0 |
| implement | 27m 55s | $38.88 | 0 |
| simplify_opus | 14m 20s | $4.93 | 0 |
| simplify_gpt | 3m 14s | $1.88 | 0 |
| verify | 8m 49s | – | 0 |
| **Total** | **59m 15s** | **$45.70** | **0** |

</details>

<details>
<summary>Ran <code>ImplementPlan.fabro</code> (11 nodes and 14
edges)</summary>

```dot
digraph ImplementPlan {
    graph [
        goal="Implement and simplify",
        model_stylesheet="
            * { model: claude-opus-4-7; }
        "
    ]
    rankdir=LR

    start [shape=Mdiamond, label="Start"]
    exit  [shape=Msquare, label="Exit"]

    toolchain         [label="Toolchain", shape=parallelogram, script="command -v cargo >/dev/null || { curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y && sudo ln -sf $HOME/.cargo/bin/* /usr/local/bin/; }; cargo --version 2>&1", max_retries=0]
    preflight_compile [label="Preflight Compile", shape=parallelogram, script="cargo check -q --workspace 2>&1", max_retries=0]
    preflight_lint    [label="Preflight Lint", shape=parallelogram, script="cargo +nightly-2026-04-14 clippy -q --workspace --all-targets -- -D warnings 2>&1", max_retries=0]
    fix_lints         [label="Fix Lints", prompt="The preflight lint step failed. Read the build output from context and fix all clippy lint warnings.", max_visits=3]
    implement         [label="Implement", prompt="Read the plan file referenced in the goal and implement every step. Make all the code changes described in the plan. Use red/green TDD.", model="gpt-55", reasoning_effort="xhigh"]
    simplify_opus     [label="Simplify (Opus)", prompt="@prompts/simplify.md"]
    simplify_gpt      [label="Simplify (GPT-55)", prompt="@prompts/simplify.md", model="gpt-55"]
    verify            [label="Verify", shape=parallelogram, script="git fetch origin main 2>&1 && git merge --no-edit --no-stat origin/main 2>&1 && cargo +nightly-2026-04-14 fmt --all 2>&1 && cargo dev docs refresh 2>&1 && cargo +nightly-2026-04-14 fmt --check --all 2>&1 && { command -v rg >/dev/null 2>&1 || { echo 'rg is required for verify'; exit 127; }; } && ! rg -n 'AuthMode::Disabled|RunAuthMethod|RunSubjectProvenance|\bActorRef\b|\bActorKind\b|AuthenticatedSubject|AuthenticatedService|AuthorizeRunScoped|AuthorizeRunBlob|AuthorizeStageArtifact|AuthorizeCommandLog|auth_method\s*==\s*\"disabled\"' lib/crates apps lib/packages docs/public/api-reference/fabro-api.yaml 2>&1 && cargo +nightly-2026-04-14 clippy --workspace --all-targets -- -D warnings 2>&1 && cargo nextest run --workspace --status-level slow --profile ci 2>&1 && cargo dev docs check 2>&1 && bun install --frozen-lockfile 2>&1 && (cd apps/fabro-web && bun run typecheck) 2>&1 && (cd apps/fabro-web && bun run test) 2>&1 && (cd lib/packages/fabro-api-client && bun run typecheck) 2>&1 && cargo dev build -- -p fabro-cli --release 2>&1", goal_gate=true, retry_target="fixup"]
    fixup             [label="Fixup", prompt="The verify step failed. Read the build output from context and fix all format, clippy, Rust test, docs, TypeScript typecheck/test, and build failures.", max_visits=3]

    start -> toolchain
    toolchain -> preflight_compile [condition="outcome=succeeded"]
    toolchain -> exit
    preflight_compile -> preflight_lint [condition="outcome=succeeded"]
    preflight_compile -> exit
    preflight_lint -> implement [condition="outcome=succeeded"]
    preflight_lint -> fix_lints
    fix_lints -> preflight_lint
    implement -> simplify_opus -> simplify_gpt -> verify
    verify -> exit  [condition="outcome=succeeded"]
    verify -> fixup
    fixup -> verify
}

```

</details>

⚒️ Generated with [Fabro](https://fabro.sh)

---------

Co-authored-by: Fabro <noreply@fabro.sh>
Co-authored-by: Bryan Helmkamp <bryan@brynary.com>
2026-05-24 16:49:05 -04:00
..
client-sdks.mdx docs: move published docs under docs/public 2026-04-26 21:19:46 -04:00
demo-mode.mdx feat(api): bind sessions to runs (#336) 2026-05-21 10:53:41 -04:00
fabro-api.yaml feat: add server sandbox provider enablement policy (#389) 2026-05-24 16:49:05 -04:00
overview.mdx docs: move published docs under docs/public 2026-04-26 21:19:46 -04:00