fix: stop feeding duplicate evidenceText into search tool context

src/agent-harness/knowhere-text.test.ts

@@ -25,8 +25,11 @@ describe("knowhereToolText", () => {
     expect(text).toContain('<knowhere operation="search" status="ok">')
     expect(text).toContain('ref="r1:result:1"')
     expect(text).toContain('ref="asset:r1:result:1"')
+    expect(text).toContain("Page one summary.")
     expect(text).toContain("Call inspectImage")
     expect(text).toContain("before finalize")
+    expect(text).not.toContain("<evidence>")
+    expect(text).not.toContain("Page one evidence.")
     expect(text).not.toContain("https://assets.example/page-1.png")
   })
 

src/agent-harness/knowhere-text.ts

@@ -56,7 +56,8 @@ export const knowhereToolText = {
         stopReason: input.response.stopReason ?? undefined,
         failureReason: input.response.failureReason ?? undefined,
       }),
-      formatOptionalTextTag("evidence", input.response.evidenceText),
+      // Model grounding comes from <chunks> (results). Do not also inject
+      // evidenceText — same bodies, no citeable refs, doubles context.
       formatEvidenceChunks(input.chunks),
       formatEvidenceAssets(input.assets),
       formatAssetInstruction(input.assets),

src/agent-harness/runtime.test.ts

@@ -156,7 +156,8 @@ describe("agent harness runtime", () => {
 
     expect(firstResult).toContain('ref="r1:result:1"')
     expect(secondResult).toContain('retrievalCount="2"')
-    expect(secondResult).toContain("Second evidence")
+    expect(secondResult).toContain("Second retrieval evidence.")
+    expect(secondResult).not.toContain("<evidence>")
     expect(secondResult).toContain('ref="r2:result:1"')
     expect(JSON.stringify(secondResult)).not.toContain("r1:result:1")
     expect(ledger.snapshot().chunks.map((chunk) => chunk.ref)).toEqual([

src/domains/chat/index.ts

@@ -291,7 +291,6 @@ export const answerQuestionWithRetrieval = (
         results: useNotebookSourceTitles(rawResults, input.sources),
         sources: input.sources,
         hardenChatAssetUrl: input.hardenChatAssetUrl,
-        evidenceText: formatRetrievalEvidenceText(retrievalResponses),
       }),
     )
     const pageCitationResults = yield* Effect.tryPromise(() =>
@@ -1343,17 +1342,6 @@ function hasDisplayedManifestArtifacts(result: HarnessRunResult): boolean {
   return result.manifest.artifacts.some((artifact) => artifact.display)
 }
 
-function formatRetrievalEvidenceText(
-  responses: readonly RetrievalQueryResponse[],
-): string | undefined {
-  const evidenceText = responses
-    .map((response): string => response.evidenceText?.trim() ?? "")
-    .filter((value): boolean => value.length > 0)
-    .join("\n")
-
-  return evidenceText || undefined
-}
-
 function getRetrievalResultKey(result: RetrievalResult): string {
   const source = result.source
   return [

src/domains/chat/media-assets.test.ts

@@ -103,8 +103,6 @@ describe("chat media assets", () => {
         }),
       ],
       hardenChatAssetUrl,
-      evidenceText:
-        "[image-6-中华人民共和国居民身份证.jpg]\n[image-7-中国居民身份证.jpg]",
     })
 
     expect(results).toHaveLength(1)

src/domains/chat/media-assets.ts

@@ -27,7 +27,6 @@ export type RetrievalResultAssetInput = {
   readonly results: readonly RetrievalResult[]
   readonly sources: readonly Source[]
   readonly hardenChatAssetUrl?: HardenChatAssetUrl
-  readonly evidenceText?: string
 }
 
 export async function enrichRetrievalResultsWithAssetUrls({