fabro/lib/crates
fabro-sh-0530[bot] 7769c5cec1
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Generate Fabro PR titles and bodies with structured output (#208)
### Summary
Fabro now asks the LLM for a structured PR title and reviewer-sized body
instead of deriving every title from the workflow goal. This ports the
compound-engineering PR-writing recipe into the existing pull request
pipeline while preserving Fabro's programmatically appended trailing
sections.

### What changed
- Replaced plain-text PR body generation with `generate_object` and a
strict `{ title, body }` schema.
- Added the sizing matrix, writing principles, visual-aid guidance, and
duplicate-section guardrails to the PR prompt.
- Added model-aware goal/plan/diff truncation caps, with unknown or
smaller-context models using the conservative tier.
- Kept goal-derived titles as a narrow fallback only when the LLM
returns a usable body with an empty title.
- Enforced a 72-character title cap across both LLM-generated and
fallback titles.
- Updated workflow, server, and integration tests for structured
responses, fallback behavior, title truncation, and blank-body failures.

### Plan Summary
- Move PR content generation to structured output.
- Keep existing body assembly and appended sections intact.
- Add coverage for title fallback and validation edge cases.

### Fabro Details

<details>
<summary>Ran 9 stages in 42m 43s for $44.59</summary>

| Stage | Duration | Cost | Retries |
|---|---|---|---|
| start | 0s | – | 0 |
| toolchain | 1s | – | 0 |
| preflight_compile | 2m 3s | – | 0 |
| preflight_lint | 2m 13s | – | 0 |
| implement | 15m 8s | $6.37 | 0 |
| simplify_opus | 11m 16s | $3.53 | 0 |
| simplify_gpt | 9m 5s | $34.69 | 0 |
| verify | 2m 17s | – | 0 |
| fmt | 2s | – | 0 |
| **Total** | **42m 43s** | **$44.59** | **0** |

</details>

<details>
<summary>Ran <code>ImplementPlan.fabro</code> (12 nodes and 15
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."]
    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="cargo +nightly-2026-04-14 clippy -q --workspace --all-targets -- -D warnings 2>&1 && cargo nextest run --cargo-quiet --workspace --status-level fail 2>&1 && cargo dev docs refresh 2>&1 && cargo dev docs check 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 clippy lint warnings, test failures, and generated docs errors.", max_visits=3]
    fmt               [label="Format", shape=parallelogram, script="cargo +nightly-2026-04-14 fmt --all 2>&1", max_retries=0]

    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 -> fmt   [condition="outcome=succeeded"]
    verify -> fixup
    fixup -> verify
    fmt -> exit
}

```

</details>

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

---------

Co-authored-by: Fabro <noreply@fabro.sh>
2026-05-04 22:00:15 -04:00
..
fabro-agent fix(openai): surface responses stream terminal errors 2026-05-04 11:12:40 -04:00
fabro-api fix(billing): render non-LLM run stages 2026-05-03 22:49:33 -04:00
fabro-auth refactor(api): unify secret metadata types 2026-04-29 20:26:13 -04:00
fabro-checkpoint Make git metadata sandbox-native 2026-04-27 21:43:15 -07:00
fabro-cli Model Test Bounded Concurrency Implementation Plan (#204) 2026-05-04 13:46:44 -04:00
fabro-client fix(cli): bound server readiness probes 2026-05-02 20:13:18 -04:00
fabro-config fix(error): preserve source chains across workspace 2026-05-01 17:30:20 -04:00
fabro-core refactor: simplify auth and actor handling 2026-05-02 11:44:17 -04:00
fabro-dev fix(docs): use MDX comment syntax for generated fences 2026-04-29 01:27:43 -04:00
fabro-devcontainer refactor(static): centralize env var names 2026-04-24 12:29:51 -04:00
fabro-dump Merge origin/main 2026-05-01 22:05:41 -04:00
fabro-github refactor(error): drop String error shims and DisplayContains test traits 2026-05-01 19:35:22 -04:00
fabro-graphviz refactor: simplify Rust review cleanup 2026-05-02 15:41:17 -04:00
fabro-hooks feat(command): distinguish cancelled commands from timeouts 2026-04-30 22:45:37 -04:00
fabro-http refactor(static): centralize env var names 2026-04-24 12:29:51 -04:00
fabro-install feat(install): add sandbox provider step to web install wizard 2026-04-27 14:59:17 -07:00
fabro-interview refactor: simplify auth and actor handling 2026-05-02 11:44:17 -04:00
fabro-llm refactor(server): simplify model availability probes 2026-05-04 11:47:37 -04:00
fabro-macros refactor(dev): simplify generated docs tooling 2026-04-24 18:41:00 -04:00
fabro-mcp fix(error): preserve source chains across workspace 2026-05-01 17:30:20 -04:00
fabro-model refactor(server): simplify model availability probes 2026-05-04 11:47:37 -04:00
fabro-oauth fix(error): preserve remaining error context 2026-05-02 10:51:15 -04:00
fabro-options-metadata refactor(dev): simplify generated docs tooling 2026-04-24 18:41:00 -04:00
fabro-proc refactor(static): centralize env var names 2026-04-24 12:29:51 -04:00
fabro-redact fix(redact): skip name fields to preserve sandbox identifiers 2026-05-03 19:57:55 -04:00
fabro-retro fix(error): preserve remaining error context 2026-05-02 10:51:15 -04:00
fabro-sandbox perf(sandbox): skip throwaway reqwest::Client in Daytona probe 2026-05-04 12:48:44 -04:00
fabro-server Generate Fabro PR titles and bodies with structured output (#208) 2026-05-04 22:00:15 -04:00
fabro-slack refactor: simplify auth and actor handling 2026-05-02 11:44:17 -04:00
fabro-spa feat(dev): gitignore embedded spa assets 2026-04-26 21:31:11 -04:00
fabro-static feat(server): validate Daytona API key scopes 2026-05-03 17:09:01 -04:00
fabro-store Merge remote-tracking branch 'origin/main' 2026-05-02 10:06:25 -04:00
fabro-telemetry refactor(static): centralize env var names 2026-04-24 12:29:51 -04:00
fabro-template refactor(async): lint std::process::Command across all targets 2026-04-12 13:35:57 -04:00
fabro-test fix(cli): bound server readiness probes 2026-05-02 20:13:18 -04:00
fabro-tracker fix(error): preserve remaining error context 2026-05-02 10:51:15 -04:00
fabro-types fix(workflow): retain exec output tails on failures 2026-05-03 21:30:34 -04:00
fabro-util refactor(error): drop String error shims and DisplayContains test traits 2026-05-01 19:35:22 -04:00
fabro-validate refactor: simplify Rust review cleanup 2026-05-02 15:41:17 -04:00
fabro-vault refactor(api): unify secret metadata types 2026-04-29 20:26:13 -04:00
fabro-workflow Generate Fabro PR titles and bodies with structured output (#208) 2026-05-04 22:00:15 -04:00