yoi/work-items/closed/20260605-040104-ticket-built-in-feature-tools/artifacts/delegation-intent.md

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# Delegation intent: Ticket built-in feature tools
## Classification
`implementation-ready` with one important architectural constraint:
- Ticket domain/backend and Ticket tool behavior should live in the `ticket` crate as much as possible.
- `pod` should contain only the thin built-in feature adapter: descriptor, host-authority/backend-root wiring, and feature contribution registration.
This avoids repeating the earlier Task split problem where stateful feature behavior lived in the generic `tools` crate while lifecycle/state ownership lived in `pod`.
## Intent
Expose typed Ticket operations as built-in Pod tools without granting arbitrary filesystem write scope over `work-items/`.
The tools must operate through the `ticket` crate's `TicketBackend` / `LocalTicketBackend`, not through `tickets.sh` shell execution and not through generic file write tools.
## Worktree / branch
- worktree: `/home/hare/Projects/yoi/.worktree/ticket-built-in-feature-tools`
- branch: `work/ticket-built-in-feature-tools`
## Architecture decision
Use this dependency/ownership shape:
```text
crates/ticket
- Ticket domain/backend
- Ticket tool input/output types
- Ticket tool implementations as llm-worker Tool impls
- ticket_tools(...) factory
crates/pod
- built-in Ticket feature descriptor
- local backend root resolution, initially <workspace>/work-items
- host authority declaration/grant wiring
- FeatureContribution registration
crates/tools
- unchanged; do not add Ticket tools here
```
Allowed dependency direction:
```text
ticket -> llm-worker # for Tool/ToolDefinition only
ticket -> serde/schemars/etc.
pod -> ticket
```
Forbidden dependency direction:
```text
ticket -> pod
```
Do not extract a lower `feature-api` crate in this ticket. A fully crate-contained feature contribution can be revisited later if/when feature API is moved below `pod`.
## Requirements
- Add Ticket tool behavior to the `ticket` crate.
- Add a thin `pod::feature::builtin::ticket` adapter that installs those tools through the existing FeatureContribution/ToolRegistry path.
- Do not put Ticket tools in `crates/tools`.
- Do not shell out to `tickets.sh`.
- Use `LocalTicketBackend` over the configured/local backend root.
- Initial backend root may be resolved as `<workspace>/work-items` by the Pod adapter.
- Register Ticket tools only when the built-in Ticket feature is explicitly installed by the Pod host adapter.
- It is acceptable for the current Pod controller to install it when `<workspace>/work-items` exists or when the project config path is otherwise clearly resolved.
- If the root is missing/unusable, fail closed or do not register tools; do not create arbitrary directories silently.
- Treat Ticket operations as typed backend authority, not generic filesystem write scope.
- If adding a new `HostAuthority` variant is appropriate, prefer an explicit Ticket/backend authority over reusing generic `Filesystem` in a way that implies arbitrary FS access.
- Preserve existing PreToolCall/tool permission path: registered tools still go through normal tool-call policy.
- Keep outputs bounded and model-readable.
- Keep write paths compatible with `./tickets.sh doctor`.
- Add focused tests for both the `ticket` crate tool behavior and the Pod feature adapter.
## Tool surface
Implement the MVP tool set unless a clear blocker appears:
- `TicketCreate`
- `TicketList`
- `TicketShow`
- `TicketComment`
- `TicketReview`
- `TicketStatus`
- `TicketClose`
- `TicketDoctor`
Optional follow-up, not required for MVP:
- `TicketArtifactWrite`
- `TicketArtifactRead`
- `TicketSearch`
## Suggested tool semantics
Keep exact schemas practical, but preserve these intentions:
- `TicketList`
- filter by status (`open`, `pending`, `closed`, `all`) and optionally label/kind/priority if easy.
- output summaries, not full bodies by default.
- `TicketShow`
- read one ticket by id/slug/query and return bounded item/thread/resolution/artifact metadata.
- `TicketCreate`
- create a Ticket with title, optional slug/kind/priority/labels, and Markdown body sections.
- do not create unresolved drafts unless the caller asks for an explicit requirements-sync/spike-style Ticket body.
- `TicketComment`
- append a typed event role: `comment`, `plan`, `decision`, or `implementation_report`.
- `TicketReview`
- append approve/request-changes review.
- `TicketStatus`
- move among open/pending/closed where supported; prefer `TicketClose` for close-with-resolution.
- `TicketClose`
- close with Markdown resolution.
- `TicketDoctor`
- report backend doctor diagnostics in bounded form.
## Non-goals
- Implementing Intake workflow/profile.
- Implementing Orchestrator routing/scheduling.
- Renaming `work-items/`.
- Removing `tickets.sh`.
- External tracker integration.
- MCP/plugin loading.
- Scheduler/lease/queue automation.
- TUI changes.
- Moving feature API into a new crate.
- Adding Ticket tools to `crates/tools`.
## Current code map
- `crates/ticket/src/lib.rs`
- Ticket domain/backend, `TicketBackend`, `LocalTicketBackend`, local tests.
- Add `tools` module or submodule here for Ticket tool behavior if the file is getting large.
- `crates/ticket/Cargo.toml`
- May need `llm-worker`, `serde`, `serde_json`, `schemars`, `async-trait`, and possibly `tokio` depending on tool implementation style.
- `crates/pod/src/feature/builtin.rs`
- Add/export built-in Ticket module.
- `crates/pod/src/feature/builtin/ticket.rs` or `crates/pod/src/feature/builtin/ticket/mod.rs`
- Thin adapter that contributes Ticket tools.
- `crates/pod/src/controller.rs`
- Installs built-in features. Add Ticket feature installation only through an explicit, bounded backend-root resolution path.
- `crates/pod/src/feature.rs`
- Host authority definitions if a Ticket/backend authority variant or tests are needed.
- `crates/pod/Cargo.toml`
- Add dependency on `ticket`.
## Critical risks
- Putting Ticket tool implementations in `pod` would undercut the purpose of extracting the Ticket backend and make the feature harder to reuse.
- Putting Ticket tools in `tools` would repeat the Task-tools responsibility problem.
- Making Ticket tools equivalent to generic filesystem write scope would violate the authority model.
- Auto-creating `work-items/` in arbitrary workspaces would surprise users; fail closed or do not register when no backend root is configured/found.
- Returning unbounded full ticket/thread/artifact content would make tool output too large.
## Validation
Run at least:
- `cargo test -p ticket`
- focused Pod feature tests, e.g. `cargo test -p pod ticket --lib` if test names allow it
- `cargo test -p pod feature --lib`
- `cargo test -p pod --lib`
- `cargo test -p tools --lib`
- `cargo check --workspace --all-targets`
- `cargo fmt --check`
- `git diff --check`
- `./tickets.sh doctor`
Run `nix build .#yoi --no-link` if feasible.
## Completion report
Report:
- worktree path / branch;
- commit hash;
- final module layout;
- exact tool names/schemas/output style;
- how backend root/authority is wired;
- evidence Ticket tools are not in `crates/tools`;
- validation results;
- unresolved risks/follow-ups;
- whether ready for external review.