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## Summary
The `GET /runs/{id}` response now carries per-stage agent state — todos,
subagents, skills, and MCP server status — directly on each
`StageProjection`, unblocking the agent-stage sidebar without any new
endpoints.
## What changed and why
**`RunProjection.todos_by_list` removed.** The run-level map was the
only home for todos, but every list was already 1:1 with a stage (keyed
by `openai_plan:<session>` or `anthropic_tasks:<root_session>`). Moving
todos onto `StageProjection.todos: Option<TodoListProjection>`
eliminates the awkward cross-stage indirection with no loss of
expressiveness.
**Four new fields on `StageProjection`** (`todos`, `subagents`,
`skills`, `mcp_servers`) plus five new projection-side types
(`SubAgentProjection`, `SubAgentStatus`, `SkillsProjection`,
`ActivatedSkill`, `McpServerProjection`, `McpServerStatus`). All
colocated in `run_projection.rs`; no new modules. Four existing
event-payload types are reused directly (`TodoListProjection`,
`AgentSkillSummary`, `AgentSkillActivationSource`,
`AgentMcpToolSummary`) via `with_replacement(...)` in
`fabro-api/build.rs` so progenitor doesn't generate parallel `ApiFoo`
aliases.
**Reducer rerouting** (`run_state.rs`): `TodoCreated/Updated/Deleted`
now resolve the owning stage via the existing
`stage_at_stored_or_current_visit` helper and mutate `stage.todos`
directly. Eight new event arms handle
`AgentSubSpawned/Completed/Failed/Closed`,
`AgentSkillsDiscovered/Activated`, and `AgentMcpReady/Failed` using the
same `stage_at_stored_or_visit` pattern already used for other agent
events.
**Design decisions called out in the plan:**
- `SkillActivated` appends every activation (event-sourced replay
semantics); the UI can collapse if needed.
- `upsert_mcp_server` replaces by `server_name`, so a server that
recovers after a failure shows its final state.
- `SubAgentStatus` and `McpServerStatus` are projection-side enums,
intentionally distinct from the runtime per-process status types in
`fabro-agent`.
**OpenAPI + TS client** updated in lockstep: new schemas added,
`todos_by_list` removed from `RunProjection`, `bun run generate`
regenerated 20+ new model files.
### Plan Summary
- Extend `StageProjection` with `todos`, `subagents`, `skills`,
`mcp_servers` + supporting types in `run_projection.rs`
- Remove `RunProjection.todos_by_list` (no cross-stage use case)
- Reroute todo reducer handlers; add 8 new event arms for
subagent/skill/MCP events
- Wire reused types through `fabro-api/build.rs` `with_replacement`;
regenerate TS client
- Update all existing todo reducer tests to read from `stage.todos`; add
new test modules for subagent, skill, and MCP event families
- Update stale comment in `run-events.ts`
### Fabro Details
<details>
<summary>Ran 9 stages in 38m 52s for $13.29</summary>
| Stage | Duration | Cost | Retries |
|---|---|---|---|
| start | 0s | – | 0 |
| toolchain | 1s | – | 0 |
| preflight_compile | 2m 6s | – | 0 |
| preflight_lint | 2m 16s | – | 0 |
| implement | 16m 8s | $7.80 | 0 |
| simplify_opus | 10m 34s | $3.91 | 0 |
| simplify_gpt | 3m 23s | $1.58 | 0 |
| verify | 3m 51s | – | 0 |
| fmt | 2s | – | 0 |
| **Total** | **38m 52s** | **$13.29** | **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.", 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="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>
Co-authored-by: Bryan Helmkamp <bryan@brynary.com>
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