feat(response): response-schema linking — generic/annotation/OpenAPI (5.5)

DataSourceNode gains an optional ResponseType { name, fields, source }
(one level of fields); lineage-graph and context-bundle schemas
regenerated, drift gates green.

New response.ts parser module:
- responseFromCall: recovers the type from a call's generic argument
  (axios.get<User[]>, useQuery<T>) or, failing that, the annotation on
  the nearest enclosing typed variable whose initializer holds the call
  (const data: Invoice[] = await fetch(...).then(r => r.json())). Stops at
  function boundaries; reads property signatures only (methods skipped).
- loadOpenApi / linkOpenApiResponses: post-pass filling untyped sources
  from an OpenAPI 3 JSON spec, matching `${METHOD} ${endpoint}` with
  {id}->:id normalization and $ref resolution.

Exposed via the `openapi` scan option and CLI `scan --openapi`. Bundle
lineage dataSources carry responseType; `trace` prints it.

New f4-typed-responses fixture + GoldenResponse / `responses` check kind
covering all three sources. 5 parser unit tests incl. bundle-level.
eval 265/0/0, gate OK.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: DeepCodeWork

TRACKER.md

@@ -5,8 +5,8 @@
 ## Status
 
 - **Current phase:** 5 — Context bundle & agent interface
-- **Next step:** 5.5 — Response-schema linking
-- **Done:** 0.1–0.4, 1.1–1.6, 2.1–2.5, 3.1–3.6, 4.1–4.6, 5.1–5.4
+- **Next step:** 5.6 — Git history
+- **Done:** 0.1–0.4, 1.1–1.6, 2.1–2.5, 3.1–3.6, 4.1–4.6, 5.1–5.5
 - **Gates passed:** Gate 0 (CI + red-path, #5/#6) · Gate 1 (precision 1.000, recall 0.895, zero poison) · Gate 2 (C1 instance attribution 1.000 · B1 4-level handler chains · C6 store writers↔readers · A9 portals — scorecard 137/0/0, precision & recall 1.000) · Gate 3 (B3 action effects · B4 routers · B6 cyclic journeys terminate · B7/B8 form & non-JSX events · G5 flag/role conditions — precision & recall 1.000) · Gate 4 (A4 rarity · A10 fuzzy/OCR · A1 structural · A6 subtree · E3 vision annotations · E2 aliases · G4 corrections — high-conf correct 1.000, ambiguity honesty 1.000, poison rate 0.000)
 
 ## What CodeRadar is
@@ -291,10 +291,11 @@ The heart of the project. C1 and B1 live here.
 **Accept:** fixture with co-located tests: bundle names the right test files; components without tests get `warnings: ["untested"]`.
 **Done:** `TestNode` (kind `test`, framework vitest/jest/unknown) + `covered-by` edge in core (schema regenerated, drift gate green). New `detectTests` parser pass: test files are excluded from the component/instance scan (`isTestFile`) so they never emit spurious nodes, then swept — every component a test renders (JSX tag) or imports resolves to a `covered-by` edge (imports resolved to their source file for precise attribution, name fallback otherwise). Bundle populates `tests` from the matched component's render subtree (`componentSubtree`) and pushes an `untested` warning when the matched component has no coverage; `blastRadius` counts a test as a dependent of the component it covers. New `f3-test-coverage` fixture + `GoldenCoverage`/`coverage` check kind (covers UserList, Sidebar untested). 6 parser unit tests (incl. two bundle-level); eval 262/0/0, gate OK.
 
-### [ ] 5.5 Response-schema linking
+### [x] 5.5 Response-schema linking
 **Failure modes:** F4
 **Build:** data sources link to response types: generic argument (`useQuery<User[]>`), annotated variable types, or an OpenAPI spec (scan option `openapi: path`) matched by endpoint pattern. Bundle lineage entries carry `responseType: { name, fields }` (one level of fields, not deep).
 **Accept:** fixture `f4-typed-responses` green for all three sources (generic, annotation, OpenAPI).
+**Done:** `ResponseType { name, fields: {name,type}[], source }` on `DataSourceNode` in core (schema regenerated, drift gate green). New `response.ts` parser module: `responseFromCall` recovers the type from a call's generic argument (`axios.get<User[]>`, `useQuery<T>`) or, failing that, the annotation on the nearest enclosing typed variable whose initializer holds the call (`const data: Invoice[] = await fetch(…).then(r => r.json())`), stopping at function boundaries; only property signatures are read (one level, methods skipped). `loadOpenApi`/`linkOpenApiResponses` is a post-pass that fills untyped sources from an OpenAPI 3 JSON spec (`openapi` scan option / CLI `--openapi`), matching `${METHOD} ${endpoint}` with `{id}`→`:id` normalization and `$ref` resolution. Bundle lineage `dataSources` carry `responseType`; `trace` prints it. New `f4-typed-responses` fixture + `GoldenResponse`/`responses` check kind (all three sources). 5 parser unit tests incl. bundle-level; eval 265/0/0, gate OK.
 
 ### [ ] 5.6 Git history context
 **Failure modes:** F5

eval/fixtures/f4-typed-responses/app/InvoicesPage.tsx

@@ -0,0 +1,24 @@
+import { useEffect, useState } from "react";
+
+import type { Invoice } from "./types";
+
+// Source 2 (annotation): the response type is the annotation on the variable
+// the fetch result lands in.
+export function InvoicesPage() {
+  const [invoices, setInvoices] = useState<Invoice[]>([]);
+  useEffect(() => {
+    async function load() {
+      const data: Invoice[] = await fetch("/api/invoices").then((r) => r.json());
+      setInvoices(data);
+    }
+    void load();
+  }, []);
+  return (
+    <div>
+      <h1>Invoices</h1>
+      {invoices.map((i) => (
+        <p key={i.id}>{i.number}</p>
+      ))}
+    </div>
+  );
+}

eval/fixtures/f4-typed-responses/app/OrdersPage.tsx

@@ -0,0 +1,20 @@
+import { useEffect, useState } from "react";
+
+// Source 3 (OpenAPI): the code says nothing about the shape — the response type
+// is recovered from the spec by matching GET /api/orders.
+export function OrdersPage() {
+  const [orders, setOrders] = useState<Record<string, unknown>[]>([]);
+  useEffect(() => {
+    fetch("/api/orders")
+      .then((r) => r.json())
+      .then(setOrders);
+  }, []);
+  return (
+    <div>
+      <h1>Orders</h1>
+      {orders.map((o, i) => (
+        <p key={i}>{String(o.id)}</p>
+      ))}
+    </div>
+  );
+}

eval/fixtures/f4-typed-responses/app/UsersPage.tsx

@@ -0,0 +1,20 @@
+import axios from "axios";
+import { useEffect, useState } from "react";
+
+import type { User } from "./types";
+
+// Source 1 (generic): the response type is the call's type argument.
+export function UsersPage() {
+  const [users, setUsers] = useState<User[]>([]);
+  useEffect(() => {
+    axios.get<User[]>("/api/users").then((res) => setUsers(res.data));
+  }, []);
+  return (
+    <div>
+      <h1>Users</h1>
+      {users.map((u) => (
+        <p key={u.id}>{u.name}</p>
+      ))}
+    </div>
+  );
+}

eval/fixtures/f4-typed-responses/app/openapi.json

@@ -0,0 +1,35 @@
+{
+  "openapi": "3.0.0",
+  "info": { "title": "Fixture API", "version": "1.0.0" },
+  "paths": {
+    "/api/orders": {
+      "get": {
+        "responses": {
+          "200": {
+            "description": "orders",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "array",
+                  "items": { "$ref": "#/components/schemas/Order" }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  "components": {
+    "schemas": {
+      "Order": {
+        "type": "object",
+        "properties": {
+          "id": { "type": "integer" },
+          "status": { "type": "string" },
+          "total": { "type": "number" }
+        }
+      }
+    }
+  }
+}

eval/fixtures/f4-typed-responses/app/types.ts

@@ -0,0 +1,11 @@
+export interface User {
+  id: number;
+  name: string;
+  email: string;
+}
+
+export interface Invoice {
+  id: number;
+  number: string;
+  total: number;
+}

eval/fixtures/f4-typed-responses/golden.json

@@ -0,0 +1,27 @@
+{
+  "failureMode": "F4",
+  "note": "Response-schema linking from all three sources: a generic type argument (axios.get<User[]>), a variable-type annotation (const data: Invoice[] = …fetch…), and an OpenAPI spec matched by endpoint (GET /api/orders → Order[]).",
+  "scan": { "openapi": "openapi.json" },
+  "expect": {
+    "responses": [
+      {
+        "endpoint": "/api/users",
+        "name": "User[]",
+        "from": "generic",
+        "fields": ["id", "name", "email"]
+      },
+      {
+        "endpoint": "/api/invoices",
+        "name": "Invoice[]",
+        "from": "annotation",
+        "fields": ["id", "number", "total"]
+      },
+      {
+        "endpoint": "/api/orders",
+        "name": "Order[]",
+        "from": "openapi",
+        "fields": ["id", "status", "total"]
+      }
+    ]
+  }
+}

eval/src/checks.ts

@@ -351,6 +351,35 @@ export function runChecks(
     }
   }
 
+  for (const spec of golden.expect.responses ?? []) {
+    const id = `response:${spec.endpoint}=>${spec.name}`;
+    const source = graph.nodes.find(
+      (n) =>
+        n.kind === "data-source" &&
+        n.endpoint === spec.endpoint &&
+        (spec.method === undefined || n.method === spec.method),
+    );
+    const rt = source?.kind === "data-source" ? source.responseType : undefined;
+    let passed = rt !== undefined && rt.name === spec.name;
+    let detail: string | undefined;
+    if (source === undefined) detail = `no data source for ${spec.endpoint}`;
+    else if (rt === undefined) detail = `no response type on ${spec.endpoint}`;
+    else if (rt.name !== spec.name) detail = `expected response ${spec.name}, got ${rt.name}`;
+    if (passed && rt !== undefined && spec.from !== undefined && rt.source !== spec.from) {
+      passed = false;
+      detail = `expected source ${spec.from}, got ${rt.source}`;
+    }
+    if (passed && rt !== undefined && spec.fields !== undefined) {
+      const have = new Set(rt.fields.map((f) => f.name));
+      const missing = spec.fields.filter((f) => !have.has(f));
+      if (missing.length > 0) {
+        passed = false;
+        detail = `missing fields [${missing.join(", ")}] (have [${[...have].join(", ")}])`;
+      }
+    }
+    finalize("responses", id, passed, spec.expectedFail, detail);
+  }
+
   for (const query of golden.expect.queries ?? []) {
     const id = `query:${query.terms.join("+") || JSON.stringify(query.structure)}`;
     const result = matchComponents(graph, {

eval/src/golden.ts

@@ -104,6 +104,21 @@ export interface GoldenCondition {
   expectedFail?: string;
 }
 
+/** A response-schema assertion (step 5.5, failure mode F4): a data source's response type. */
+export interface GoldenResponse {
+  /** Endpoint the data source resolves to. */
+  endpoint: string;
+  /** HTTP method, to disambiguate same-endpoint sources. */
+  method?: string;
+  /** Expected response-type name (e.g. "User[]"). */
+  name: string;
+  /** Where the type must have come from. */
+  from?: "generic" | "annotation" | "openapi";
+  /** Field names that must appear in the response type. */
+  fields?: string[];
+  expectedFail?: string;
+}
+
 /** A test-coverage assertion (step 5.4, failure mode F3): covered-by edges. */
 export interface GoldenCoverage {
   component: string;
@@ -155,6 +170,8 @@ export interface Golden {
     baseUrls?: string[];
     apiWrappers?: string[];
     i18n?: { localeGlobs: string[]; defaultLocale: string };
+    /** OpenAPI spec path (relative to the app dir) for response-schema linking (5.5). */
+    openapi?: string;
   };
   expect: {
     components?: GoldenComponent[];
@@ -176,6 +193,8 @@ export interface Golden {
     blast?: GoldenBlast[];
     /** Test coverage via covered-by edges (step 5.4, F3). */
     coverage?: GoldenCoverage[];
+    /** Response types on data sources (step 5.5, F4). */
+    responses?: GoldenResponse[];
   };
 }
 
@@ -195,7 +214,8 @@ export interface CheckResult {
     | "conditions"
     | "externals"
     | "blast"
-    | "coverage";
+    | "coverage"
+    | "responses";
   status: CheckStatus;
   detail?: string;
 }

packages/agent-sdk/src/bundle.ts

@@ -11,6 +11,7 @@
  */
 import {
   blastRadius,
+  type DataSourceNode,
   type ImpactNode,
   type JourneyPath,
   journeys,
@@ -29,10 +30,17 @@ export interface BundleMatch {
   evidence: string[];
 }
 
+export interface BundleDataSource {
+  method: string | null;
+  endpoint: string;
+  /** Response shape (5.5, F4), when recoverable — name + one level of fields. */
+  responseType?: { name: string; fields: { name: string; type: string }[]; source: string };
+}
+
 export interface BundleLineageEntry {
   /** Component name, or `Name@file:line` for a specific instance. */
   target: string;
-  dataSources: { method: string | null; endpoint: string }[];
+  dataSources: BundleDataSource[];
   state: string[];
   events: string[];
 }
@@ -136,10 +144,7 @@ export function buildBundle(
     if (definitionLineage !== undefined) {
       bundle.lineage.push({
         target: top.component.name,
-        dataSources: definitionLineage.dataSources.map((d) => ({
-          method: d.method,
-          endpoint: d.endpoint,
-        })),
+        dataSources: definitionLineage.dataSources.map(bundleDataSource),
         state: definitionLineage.state.map((s) => s.name),
         events: definitionLineage.events.map((e) => e.event),
       });
@@ -149,7 +154,7 @@ export function buildBundle(
       if (instLineage === undefined || instLineage.dataSources.length === 0) continue;
       bundle.lineage.push({
         target: `${top.component.name}@${instance.loc.file}:${instance.loc.line}`,
-        dataSources: instLineage.dataSources.map((d) => ({ method: d.method, endpoint: d.endpoint })),
+        dataSources: instLineage.dataSources.map(bundleDataSource),
         state: [],
         events: [],
       });
@@ -187,6 +192,15 @@ export function buildBundle(
   return trimToBudget(bundle, budgetTokens);
 }
 
+/** Project a data-source node into the bundle shape, carrying its response type when present. */
+function bundleDataSource(d: DataSourceNode): BundleDataSource {
+  return {
+    method: d.method,
+    endpoint: d.endpoint,
+    ...(d.responseType !== undefined ? { responseType: d.responseType } : {}),
+  };
+}
+
 /** Component ids in the render subtree of `rootId` (itself plus renders → instance-of descendants). */
 function componentSubtree(graph: LineageGraph, rootId: string): Set<string> {
   const rendersFrom = new Map<string, string[]>();