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Fabro 2026-03-15 19:11:37 -04:00
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Goal: # Unified dry-run via Handler::simulate()
## Context
Dry-run mode is implemented inconsistently: `CommandHandler` checks `services.dry_run`, `AgentHandler`/`PromptHandler`/`FanInHandler` rely on backend being `None`, and `WaitHandler`/`HumanHandler` have no dry-run handling at all (sleeping for real / blocking on input). This makes adding dry-run to new handlers error-prone and the existing code confusing.
**Goal:** Single mechanism where the engine routes to `simulate()` or `execute()` based on `services.dry_run`. Each handler optionally overrides `simulate()` for custom behavior.
## Design
### New abstractions
1. **`Outcome::simulated(node_id)`** — factory returning `Success` with `notes: "[Simulated] {node_id}"`
2. **`Handler::simulate()`** — trait method with default returning `Outcome::simulated(&node.id)`
3. **`dispatch_handler()`** — free function in `handler/mod.rs` that calls `simulate()` or `execute()` based on `services.dry_run`
### Dispatch change
Replace direct `handler.execute()` calls with `dispatch_handler()` at two sites:
- `engine.rs:964` — in `execute_with_retry()`
- `parallel.rs:439` — child handler dispatch in spawned tasks
### Handler simulate() overrides
| Handler | Override? | Behavior |
|---|---|---|
| Start, Exit, Conditional | No | Default: generic `[Simulated]` success |
| **WaitHandler** | No | Default: instant success, **no sleep** |
| **CommandHandler** | Yes | Empty `command.output`/`command.stderr` context updates + note with script text |
| **AgentHandler** | Yes | `last_stage`, `last_response`, `response.{id}` context updates with simulated text |
| **PromptHandler** | Yes | Same as Agent — simulated response context updates |
| **FanInHandler** | Yes | Call `heuristic_select()` directly (no LLM, no git merge) |
| **HumanHandler** | Yes | Auto-select first choice, set `human.gate.selected`/`human.gate.label` + `suggested_next_ids` |
| **ParallelHandler** | Yes | Find join node → set `jump_to_node`, set `parallel.branch_count`, dispatch children via `dispatch_handler()`, skip all git worktree ops |
| SubWorkflowHandler | No | Default. Already propagates `dry_run` to child engine's `RunConfig`; child engine will use `dispatch_handler()` automatically |
### Cleanup from execute()
- **CommandHandler**: remove `if services.dry_run { ... }` block (move logic to `simulate()`)
- **AgentHandler/PromptHandler/FanInHandler**: leave `backend=None` paths as-is for now (they become unreachable during dry-run but serve as error fallback). Making backend non-optional is a separate follow-up.
## Files to modify
1. `lib/crates/fabro-workflows/src/outcome.rs` — add `Outcome::simulated()`
2. `lib/crates/fabro-workflows/src/handler/mod.rs` — add `simulate()` to trait, add `dispatch_handler()`
3. `lib/crates/fabro-workflows/src/engine.rs` — use `dispatch_handler()` in `execute_with_retry()` (~line 964)
4. `lib/crates/fabro-workflows/src/handler/command.rs` — move dry-run block to `simulate()`, remove from `execute()`
5. `lib/crates/fabro-workflows/src/handler/agent.rs` — add `simulate()` override
6. `lib/crates/fabro-workflows/src/handler/prompt.rs` — add `simulate()` override
7. `lib/crates/fabro-workflows/src/handler/fan_in.rs` — add `simulate()` override
8. `lib/crates/fabro-workflows/src/handler/human.rs` — add `simulate()` override
9. `lib/crates/fabro-workflows/src/handler/parallel.rs` — add `simulate()` override, use `dispatch_handler()` for child dispatch
## Tests
- Test `dispatch_handler()` routes to `simulate()` when `dry_run=true`, `execute()` when `false`
- Test each handler's `simulate()` returns expected context updates
- Update existing `dry_run_skips_execution` test in command.rs to test `simulate()` directly
- Update `codergen_handler_simulation_mode` in agent.rs
- Update `prompt_handler_simulation_mode` in prompt.rs
## Verification
```bash
cargo test -p fabro-workflows # all tests pass
cargo clippy -p fabro-workflows --tests -- -D warnings # no new warnings
fabro run <workflow> --dry-run # workflow completes instantly, no real execution
```
## Completed stages
- **toolchain**: success
- 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`
- Stdout:
```
cargo 1.94.0 (85eff7c80 2026-01-15)
```
- Stderr: (empty)
- **preflight_compile**: success
- Script: `cargo check 2>&1`
- Stdout:
```
Updating crates.io index
Updating git repository `https://github.com/brynary/daytona-sdk-rust`
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Compiling native-tls v0.2.18
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Compiling siphasher v1.0.2
Compiling strsim v0.11.1
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Compiling mime_guess v2.0.5
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Compiling rustix v1.1.4
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Checking encoding_rs v0.8.35
Compiling getrandom v0.3.4
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Compiling cfg_aliases v0.2.1
Compiling rand_core v0.6.4
Compiling rand v0.8.5
Compiling convert_case v0.10.0
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Checking deranged v0.5.8
Compiling phf_codegen v0.11.3
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Compiling darling v0.21.3
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Compiling toml_datetime v0.6.11
Checking derive_more v2.1.1
Compiling libgit2-sys v0.18.3+1.9.2
Compiling memoffset v0.9.1
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Compiling darling_macro v0.23.0
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Compiling toml v0.8.23
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Compiling phf_shared v0.13.1
Compiling ahash v0.8.12
Compiling serde_derive_internals v0.29.1
Checking tracing-log v0.2.0
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Compiling schemars_derive v1.2.1
Compiling phf_generator v0.13.1
Checking rand_chacha v0.3.1
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Compiling fabro-util v0.5.0 (/home/daytona/workspace/lib/crates/fabro-util)
Compiling darling v0.23.0
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Compiling match_token v0.35.0
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Compiling unicode-general-category v1.1.0
Checking unicode-width v0.1.14
Checking clap_lex v1.0.0
Checking borrow-or-share v0.2.4
Checking hex v0.4.3
Compiling heck v0.5.0
Checking dyn-clone v1.0.20
Compiling rmcp v0.15.0
Checking bit-vec v0.8.0
Compiling clap_derive v4.5.55
Checking bit-set v0.8.0
Checking schemars v1.2.1
Checking clap_builder v4.5.60
Checking fluent-uri v0.4.1
Checking termimad v0.34.1
Checking html5ever v0.35.0
Checking num v0.4.3
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Checking mac_address v1.1.8
Compiling rmcp-macros v0.15.0
Checking rand v0.9.2
Compiling phf_macros v0.13.1
Checking dirs v6.0.0
Checking xml5ever v0.35.0
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Checking clap v4.5.60
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Compiling asn1-rs-impl v0.2.0
Compiling asn1-rs-derive v0.5.1
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Checking matchit v0.8.4
Checking pathdiff v0.2.3
Checking open v5.3.3
Compiling fabro-cli v0.5.0 (/home/daytona/workspace/lib/crates/fabro-cli)
Checking axum v0.8.8
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Checking tracing-appender v0.2.4
Checking rustls-pemfile v2.2.0
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Checking jsonwebtoken v10.3.0
Checking git2 v0.20.4
Checking fabro-git-storage v0.5.0 (/home/daytona/workspace/lib/crates/fabro-git-storage)
Checking tokio-rustls v0.26.4
Checking rustls-platform-verifier v0.6.2
Checking tungstenite v0.26.2
Checking hyper-rustls v0.27.7
Checking reqwest v0.12.28
Checking reqwest v0.13.2
Checking tokio-tungstenite v0.26.2
Checking reqwest-middleware v0.4.2
Checking jsonschema v0.42.2
Checking daytona-toolbox-client v0.1.0 (https://github.com/brynary/daytona-sdk-rust?rev=06033ca#06033caa)
Checking fabro-llm v0.5.0 (/home/daytona/workspace/lib/crates/fabro-llm)
Checking daytona-api-client v0.1.0 (https://github.com/brynary/daytona-sdk-rust?rev=06033ca#06033caa)
Checking fabro-github v0.5.0 (/home/daytona/workspace/lib/crates/fabro-github)
Checking fabro-devcontainer v0.5.0 (/home/daytona/workspace/lib/crates/fabro-devcontainer)
Checking fabro-openai-oauth v0.5.0 (/home/daytona/workspace/lib/crates/fabro-openai-oauth)
Checking fabro-mcp v0.5.0 (/home/daytona/workspace/lib/crates/fabro-mcp)
Checking fabro-agent v0.5.0 (/home/daytona/workspace/lib/crates/fabro-agent)
Checking daytona-sdk v0.1.0 (https://github.com/brynary/daytona-sdk-rust?rev=06033ca#06033caa)
Checking fabro-ssh v0.5.0 (/home/daytona/workspace/lib/crates/fabro-ssh)
Checking fabro-workflows v0.5.0 (/home/daytona/workspace/lib/crates/fabro-workflows)
Checking fabro-config v0.5.0 (/home/daytona/workspace/lib/crates/fabro-config)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 00s
```
- Stderr: (empty)
- **preflight_lint**: success
- Script: `cargo clippy -- -D warnings 2>&1`
- Stdout:
```
Compiling fabro-util v0.5.0 (/home/daytona/workspace/lib/crates/fabro-util)
Checking fabro-mcp v0.5.0 (/home/daytona/workspace/lib/crates/fabro-mcp)
Checking fabro-tracker v0.5.0 (/home/daytona/workspace/lib/crates/fabro-tracker)
Checking fabro-git-storage v0.5.0 (/home/daytona/workspace/lib/crates/fabro-git-storage)
Checking fabro-github v0.5.0 (/home/daytona/workspace/lib/crates/fabro-github)
Checking fabro-devcontainer v0.5.0 (/home/daytona/workspace/lib/crates/fabro-devcontainer)
Compiling fabro-cli v0.5.0 (/home/daytona/workspace/lib/crates/fabro-cli)
Checking fabro-openai-oauth v0.5.0 (/home/daytona/workspace/lib/crates/fabro-openai-oauth)
Checking fabro-llm v0.5.0 (/home/daytona/workspace/lib/crates/fabro-llm)
Checking fabro-agent v0.5.0 (/home/daytona/workspace/lib/crates/fabro-agent)
Checking fabro-ssh v0.5.0 (/home/daytona/workspace/lib/crates/fabro-ssh)
Checking fabro-workflows v0.5.0 (/home/daytona/workspace/lib/crates/fabro-workflows)
Checking fabro-config v0.5.0 (/home/daytona/workspace/lib/crates/fabro-config)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 14.22s
```
- Stderr: (empty)
Read the plan file referenced in the goal and implement every step. Make all the code changes described in the plan.

View file

@ -0,0 +1,5 @@
{
"mode": "agent",
"provider": "anthropic",
"model": "claude-opus-4-6"
}

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@ -0,0 +1,47 @@
All changes are correct. Let me provide a summary of everything that was implemented:
## Summary of Changes
### 1. `outcome.rs` — Added `Outcome::simulated()`
- New factory method `Outcome::simulated(node_id)` returning `Success` with `notes: "[Simulated] {node_id}"`
- Added test `outcome_simulated_factory`
### 2. `handler/mod.rs` — Added `simulate()` to trait + `dispatch_handler()`
- Added `Handler::simulate()` trait method with default implementation returning `Outcome::simulated(&node.id)`
- Added `dispatch_handler()` free function that routes to `simulate()` when `services.dry_run` is true, otherwise `execute()`
- Added tests: `dispatch_handler_routes_to_simulate_when_dry_run`, `dispatch_handler_routes_to_execute_when_not_dry_run`
### 3. `engine.rs` — Dispatch change
- Replaced `handler.execute(...)` with `crate::handler::dispatch_handler(handler, ...)` in `execute_with_retry()`
### 4. `handler/command.rs` — Moved dry-run to `simulate()`
- Added `simulate()` override with empty `command.output`/`command.stderr` context updates + note with script text
- Removed `if services.dry_run { ... }` block from `execute()`
- Updated test `dry_run_skips_execution` → `simulate_skips_execution` (tests `simulate()` directly)
- Added test `dispatch_routes_to_simulate_in_dry_run`
### 5. `handler/agent.rs` — Added `simulate()` override
- Sets `last_stage`, `last_response`, `response.{id}` context updates with simulated text
- Updated test `codergen_handler_simulation_mode` → `codergen_handler_simulate`
### 6. `handler/prompt.rs` — Added `simulate()` override
- Same context updates as agent handler (simulated response)
- Updated test `prompt_handler_simulation_mode` → `prompt_handler_simulate`
### 7. `handler/fan_in.rs` — Added `simulate()` override
- Calls `heuristic_select()` directly (no LLM, no git merge)
- Added test `fan_in_simulate_uses_heuristic`
### 8. `handler/human.rs` — Added `simulate()` override
- Auto-selects first choice from outgoing edges
- Sets `human.gate.selected`, `human.gate.label`, and `suggested_next_ids`
- Added test `simulate_selects_first_choice`
### 9. `handler/parallel.rs` — Added `simulate()` override + dispatch change
- Finds join node → sets `jump_to_node`; sets `parallel.branch_count`; dispatches children via `dispatch_handler()` (which recurses into their `simulate()`); skips all git worktree ops
- Updated child dispatch in `execute()` to use `dispatch_handler()`
- Added test `parallel_handler_simulate`
### Handlers using default `simulate()` (no override needed)
- **Start, Exit, Conditional, Wait**: Use default generic `[Simulated]` success — WaitHandler no longer sleeps during dry-run
- **SubWorkflowHandler**: Uses default; already propagates `dry_run` to child engine via `RunConfig`

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{
"status": "success",
"notes": "Stage completed: implement",
"failure_reason": null,
"timestamp": "2026-03-15T23:11:37.178645+00:00"
}