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46 lines
2.9 KiB
Markdown
46 lines
2.9 KiB
Markdown
---
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issue: 130
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issue_title: "refactor: replace HandlerDeps with handler classes using narrow constructor injection"
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---
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# Retro: #130 — replace HandlerDeps with handler classes
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## Final Retrospective (2026-05-08T02:55:00Z)
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### Session summary
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Replaced the monolithic `HandlerDeps` interface and free-function handlers with three handler classes (`SessionLifecycleHandler`, `AgentPrepHandler`, `PermissionGateHandler`), each with 2–3 narrow constructor deps.
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Absorbed `canPrompt`/`prompt`/`createPermissionRequestId` into `PermissionSession`, added a `ToolRegistry` interface, relocated `PromptPermissionDetails` to `permission-prompter.ts`, and deleted `src/handlers/types.ts`.
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Released as v5.11.0.
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This completes the full handler decomposition series (#126 → #127 → #128 → #129 → #130).
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### Observations
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#### What went well
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- The 8-step incremental plan converted one handler class at a time, keeping the repo green after every commit.
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Zero rework across all steps.
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- The lift-and-shift pattern (introduce new alongside old, migrate, delete old last) worked exactly as designed. `HandlerDeps` survived until step 7, so steps 4–6 could each wire their new class in `index.ts` independently.
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- Test factory simplification was dramatic: `makeDeps()` with 8 unrelated fields replaced by `new Handler(mockSession, ...)` with 2–3 typed deps.
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No `as unknown as` casts needed for the narrow mocks.
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- Full test suite (1288 tests) passed at every step with no behavioral changes, confirming this was a pure refactor.
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- The plan correctly identified that `canPrompt`/`prompt` needed to migrate to `PermissionSession` (deferred from #129), preventing a gap when `HandlerDeps` was deleted.
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#### What caused friction (agent side)
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- `missing-context` — Step 7 (delete `HandlerDeps`) broke `tests/permission-prompter.test.ts` which imported `PromptPermissionDetails` from the deleted `src/handlers/types.ts`.
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The plan's module-level changes table did not list this test file.
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Caught by `pnpm run build`, fixed immediately.
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Impact: one extra build-fix cycle, no rework.
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- `missing-context` — Stale `HandlerDeps` references in JSDoc comments across `src/permission-prompter.ts`, `src/session-logger.ts`, `src/forwarding-manager.ts`, and `docs/architecture/permission-prompter.md` were not flagged by the plan.
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Caught during cleanup with `grep`.
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Impact: added friction but no rework — comments were updated in the same commit.
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- `other` — Autoformat (Biome) reordered imports in `src/index.ts` between the handler barrel edit and the wiring edit in step 4, causing the second `Edit` call to fail on `oldText` mismatch.
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Required re-reading the file to get the new import order.
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Impact: one extra read + retry, ~10 seconds.
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#### What caused friction (user side)
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- No friction observed.
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The user's plan was well-scoped and the issue body provided exact class signatures, making implementation straightforward.
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