From 49ee3ba85a97211ce1fa47bfbd3cd295b7e2984d Mon Sep 17 00:00:00 2001
From: Kit Langton <kit.langton@gmail.com>
Date: Sun, 10 May 2026 11:54:54 -0400
Subject: [PATCH] Source diff message query pattern (#26638)

---
 .../server/routes/instance/httpapi/public.ts    |  1 -
 .../server/httpapi-query-schema-drift.test.ts   | 17 +++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/packages/opencode/src/server/routes/instance/httpapi/public.ts b/packages/opencode/src/server/routes/instance/httpapi/public.ts
index 1a294f84e7..612ff83aeb 100644
--- a/packages/opencode/src/server/routes/instance/httpapi/public.ts
+++ b/packages/opencode/src/server/routes/instance/httpapi/public.ts
@@ -62,7 +62,6 @@ const QueryParameterSchemas: Record<string, OpenApiSchema> = {
   "GET /experimental/session limit": { type: "number" },
   "GET /session start": { type: "number" },
   "GET /session limit": { type: "number" },
-  "GET /session/{sessionID}/diff messageID": { type: "string", pattern: "^msg.*" },
   "GET /session/{sessionID}/message limit": { type: "integer", minimum: 0, maximum: Number.MAX_SAFE_INTEGER },
   "GET /api/session limit": { type: "number" },
   "GET /api/session start": { type: "number" },
diff --git a/packages/opencode/test/server/httpapi-query-schema-drift.test.ts b/packages/opencode/test/server/httpapi-query-schema-drift.test.ts
index bf24f90353..d8eb780646 100644
--- a/packages/opencode/test/server/httpapi-query-schema-drift.test.ts
+++ b/packages/opencode/test/server/httpapi-query-schema-drift.test.ts
@@ -75,6 +75,10 @@ const numericSdkQueryParams = [
   { method: "get", path: "/api/session/:sessionID/message", name: "limit", schema: { type: "number" } },
 ] satisfies Array<{ method: Method; path: string; name: string; schema: OpenApiSchema }>
 
+const queryParamPatterns = [
+  { method: "get", path: SessionPaths.diff, name: "messageID", pattern: "^msg" },
+] satisfies Array<{ method: Method; path: string; name: string; pattern: string }>
+
 const pathParamPatterns = [
   { method: "get", path: SessionPaths.get, name: "sessionID", pattern: "^ses" },
   { method: "get", path: SessionPaths.message, name: "messageID", pattern: "^msg" },
@@ -169,6 +173,19 @@ describe("httpapi query schema drift", () => {
     }),
   )
 
+  it.effect(
+    "OpenAPI query parameter patterns come from runtime schemas",
+    Effect.sync(() => {
+      const spec = OpenApi.fromApi(PublicApi)
+      for (const expected of queryParamPatterns) {
+        expect(
+          queryParameter(spec.paths[openApiPath(expected.path)]?.[expected.method], expected.name)?.schema,
+          `${expected.method.toUpperCase()} ${expected.path} ${expected.name}`,
+        ).toEqual({ type: "string", pattern: expected.pattern })
+      }
+    }),
+  )
+
   it.effect(
     "OpenAPI workspace query params are declared by runtime query schemas",
     Effect.sync(() => {