14. Extending it in Rust

To add	Touch
a step type	a module in `app/src/kinds/` with a `With` struct (`deny_unknown_fields`), a `build` function that validates it, and a `Task` impl; plus one line in `KindRegistry::builtin` (mark it terminal, or as an approval point, if it is one)
a connector type	an `impl IntegrationConnector` in `crates/integrations` and one arm in `engine::adapters::build_connector`
a model provider type	an `impl LlmProvider` in `crates/llm` and one arm in `engine::adapters::build_llms`
a parser type	an `impl DocumentParser` in `crates/documents` and one arm in `engine::adapters::build_parsers`
a table	a SQL migration in `migration/` and a store method in `app/src/stores/` (PostgreSQL and in-memory)

Each step is wrapped for you. Retries come from the node's retry, and every outcome is written to the audit trail; a step whose audit write fails does not proceed.

Checks

cargo fmt --all --check
cargo clippy --workspace --all-targets -- -D warnings
cargo test --workspace                                            # no database needed
cargo test -p bo-app --test http -- --ignored --test-threads=1    # needs PostgreSQL + pgvector (bo_test)
cargo deny check licenses bans advisories sources
cd web && bun run build && bun run type-check && bun run license:check

CI runs all of these on every change under agents/backoffice-agents/, license gate first (.github/workflows/backoffice-agents.yml).

Checks​

Checks