# Contributor handoff — fastify/fastify

> Canonical page: https://codevetter.com/unpack/fastify/agent-handoff

# Contributor handoff — fastify/fastify

Scanned commit 19d5be0daf1c0daace758efe3ea788f924ca1224 (2026-09-29). Generated by codevetter codevetter 1.15.0 on 2026-10-02.

Source inspection; upstream code and tests were not executed.

Start from package wiring, factory assembly, and lifecycle documentation, then trace the exact changed behavior into its modules. Preserve plugin scope boundaries and boot-time context finalization. Tests and CI were inspected, not executed; their existence is not a passing result. The inventory is bounded, and generated-code checks or runtime verification require authorization beyond this read-only investigation.
- Read package.json and fastify.js first to establish package entry, declaration entry, scripts, and runtime assembly. — [package.json#L1-30](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/package.json#L1-L30) [fastify.js#L89-117](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/fastify.js#L89-L117)
- Use Lifecycle and Encapsulation references alongside implementation to understand hook ordering and parent/child visibility. — [docs/Reference/Lifecycle.md#L12-42](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/docs/Reference/Lifecycle.md#L12-L42) [docs/Reference/Encapsulation.md#L22-32](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/docs/Reference/Encapsulation.md#L22-L32)
- Changes to scoped mutable facilities must account for plugin-override's copying of Request, Reply, parsers, hooks, prefixes, and schema controllers. — [lib/plugin-override.js#L38-52](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/lib/plugin-override.js#L38-L52)
- Route contexts are finalized during preReady, including hook binding, constructor optimization, 404 association, and schema compilation. — [lib/route.js#L389-439](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/lib/route.js#L389-L439)
- Preserve explicit undefined checks for boolean JSON schemas; false schemas must still trigger compiler setup. — [lib/route.js#L413-421](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/lib/route.js#L413-L421) [lib/validation.js#L228-240](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/lib/validation.js#L228-L240)
- Follow neostandard with TypeScript enabled, no trailing commas, and the configured 120-character rule exceptions. — [eslint.config.js#L4-25](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/eslint.config.js#L4-L25)
- Generated config-validator and error-serializer are excluded from lint; integrity verification rebuilds them and compares Git diffs. — [eslint.config.js#L6-9](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/eslint.config.js#L6-L9) [package.json#L13-25](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/package.json#L13-L25)
- When execution is authorized, existing broad verification entrypoints are npm run unit, npm run test:types, npm run lint, and npm run test:ci; none was executed for this brief. — [package.json#L17-28](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/package.json#L17-L28)
- Type-provider behavior has separate declaration assertions, so runtime success alone would not validate provider inference. — [test/types/type-provider.tst.ts#L27-47](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/test/types/type-provider.tst.ts#L27-L47) [package.json#L26-28](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/package.json#L26-L28)
- Do not infer database integration correctness from the core smoke fixture: its inspected handlers return static or path-derived responses, while database operations appear in plugin examples. — [integration/server.js#L12-28](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/integration/server.js#L12-L28) [docs/Guides/Database.md#L81-98](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/docs/Guides/Database.md#L81-L98)
- Treat CI matrices and coverage thresholds as inspected configuration, not execution evidence; broader compatibility includes external workflow implementations outside this repository. — [.github/workflows/ci.yml#L31-38](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/.github/workflows/ci.yml#L31-L38) [.github/workflows/ci.yml#L54-87](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/.github/workflows/ci.yml#L54-L87) [package.json#L15-16](https://github.com/fastify/fastify/blob/19d5be0daf1c0daace758efe3ea788f924ca1224/package.json#L15-L16)

Every claim links to its cited files at the pinned commit. Citations identify source evidence; they do not establish runtime correctness. Independent CodeVetter scan — not reviewed by upstream maintainers.

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