FastAPI

Worked with the existing callback application to keep immediate acknowledgement while adding durable retry for failed downstream calls.

What worked

Existing application structure made it clear where to add retry handling without changing the external contract.

Relied on the existing web framework as the host for the analysis endpoint, updating request handling to call the sandbox executor and map infrastructure versus code errors to appropriate responses.

What worked

Existing endpoint structure made it straightforward to replace in-process execution with the remote executor and preserve error handling.

Relied on the existing web framework and its test client for ingest API tests and a local end-to-end smoke check covering validation, batched publishing, and consumer processing.

What worked

Test client provided a simple way to exercise the HTTP ingest path without running a separate server process.

Extended existing contract routes to emit lifecycle events on creation, first activation, and renewal or extension, keeping the warehouse as the reporting source.

What worked

Router and model extension points were clear and import checks confirmed the new event types loaded alongside existing models.

Relied on the existing web framework routing and dependency injection for public configuration, token sync, profile endpoints, and fallback between new and legacy token paths.

What worked

Existing router and dependency structure accommodated new endpoints and dual-token validation without restructuring the application.

Relied on existing web framework request path as trace root; added framework instrumentation with excluded health and docs routes and a request hook to strip sensitive headers and query strings.

What worked

Request spans correlated naturally with DB spans; exclusion and hook points covered the hot summary path without changing route logic.

Relied on the incumbent web framework as the instrumentation target for request latency, cache behavior, webhook handling and scheduled-task routes. No framework change was needed; existing route structure carried the new telemetry cleanly.

What worked

Route-centric structure made it obvious where to attach latency, cache and webhook-failure signals.

Used as the existing web framework being instrumented with request middleware, correlation IDs and exception handling. Instrumentation integration was straightforward.

What worked

Middleware and instrumentation hooks fit the existing app structure without major refactoring.

Extended the existing API with token sync and client configuration endpoints and updated request authentication to support both legacy tokens and the new managed identity tokens.

What worked

Route registration and application imports passed consistently, and the layered bearer validation plus provisioning flow was straightforward to implement.

Relied on the existing web framework to attach startup logging setup and request middleware recording method, path, status, timing and request IDs. A probe confirmed success and not-found responses behaved and error records matched the expected shape.

What worked

Middleware integration and startup wiring worked without changing existing route behavior.

Extended the existing contracts router with a new summary route, caching, ownership checks, and error mapping while keeping it off the existing hot path.

What worked

Route registration, dependency overrides, and app import verification worked for endpoint-level checks with mocked gateway and cache layers.

What got in the way

Route introspection output was noisy because of entries without paths, which made confirming the new route less direct.

Usedexisting app framework and its test client to add a search endpoint with tenant and reader pre-filtering, recheck of read permission, and audit logging without text. Manual probe needed path adjustment before it ran, then confirmed the endpoint behavior.

What worked

Routing, request validation and test client made endpoint verification straightforward once imports resolved.

What got in the way

Initial probe runs failed before the module search path was set correctly.

Built durable handoff and polling endpoints on the existing web framework, returning accepted responses on submission with later status and download operations.

What worked

Routing, request validation, status codes, and generated API schema inspection worked with little friction.

Used as the API framework for the existing query service. Added an auth router for token exchange and workspace listing alongside existing routes.

What worked

Router mounting and request handling fit the existing service structure with minimal churn.

Added a workspace-scoped summary route using existing tenancy helpers plus a workspace usage route in billing; all related tests passed and registration worked cleanly.

What worked

Router and dependency-injection patterns made tenant scoping and service wiring straightforward.

Relied on the existing web framework for the brief endpoint that now researches before writing, persists citations, and surfaces warnings on failure or empty results.

What worked

Existing API tests continued to pass after the research step and prompt changes were added.

Implemented immediate-accept and worker endpoints with status guards, and verified them with the framework test client plus doubled downstream services.

What worked

Endpoint routing plus test client made accept-at-once and redelivery cases easy to exercise.

What got in the way

Debugging delivery-auth and response-status expectations required extra iterations around test doubles and endpoint contracts.

Added document list, upload-URL, download-URL, and delete endpoints with existing ownership checks and verified them through the generated API surface.

What worked

Router registration and ownership reuse were straightforward and visible in the API schema.

Relied on the existing web framework for ownership-checked upload-URL and download-URL endpoints and used its route and schema inspection to confirm both endpoints were registered.

What worked

Existing dependency and ownership patterns made the new endpoints consistent, and route inspection confirmed registration without extra tooling.

Used as the existing web framework for changing the publish endpoint to return immediately after enqueueing and for adding an authenticated worker endpoint that performs the multi-step chain. App imports and endpoint-focused tests passed after the changes.

What worked

Endpoint and dependency patterns accommodated the new immediate-response plus background-worker shape without major restructuring.

Relied on the existing web framework routers for signup and admin reminder endpoints. Added per-recipient error handling and non-failing welcome-mail behavior without changing the established route structure.

What worked

Router structure made it clear where delivery and failure handling belonged.

Extended the existing API with search, audit, and reindex endpoints and hooked document lifecycle operations into index sync. Auth and permission helpers remained the authority and tests for isolation and revocation passed.

What worked

Adding authenticated endpoints and reusing the existing permission check for post-filter validation was straightforward.

Relied on the existing web framework for a new organization-scoped summary route, request validation, and generated API description checks. Route registration and schema inspection worked without added dependencies.

What worked

Adding an org-scoped route and checking it through the router and generated API description was smooth.