fix: route GitLab Duo Workflow system prompt via flowConfig (#18928)

bun.lock

@@ -358,7 +358,7 @@
         "drizzle-orm": "catalog:",
         "effect": "catalog:",
         "fuzzysort": "3.1.0",
-        "gitlab-ai-provider": "5.3.1",
+        "gitlab-ai-provider": "5.3.2",
         "glob": "13.0.5",
         "google-auth-library": "10.5.0",
         "gray-matter": "4.0.3",
@@ -3036,7 +3036,7 @@
 
     "github-slugger": ["[email protected]", "", {}, "sha512-IaOQ9puYtjrkq7Y0Ygl9KDZnrf/aiUJYUpVf89y8kyaxbRG7Y1SrX/jaumrv81vc61+kiMempujsM3Yw7w5qcw=="],
 
-    "gitlab-ai-provider": ["[email protected].1", "", { "dependencies": { "@anthropic-ai/sdk": "^0.71.0", "@anycable/core": "^0.9.2", "graphql-request": "^6.1.0", "isomorphic-ws": "^5.0.0", "openai": "^6.16.0", "socket.io-client": "^4.8.1", "vscode-jsonrpc": "^8.2.1", "zod": "^3.25.76" }, "peerDependencies": { "@ai-sdk/provider": ">=2.0.0", "@ai-sdk/provider-utils": ">=3.0.0" } }, "sha512-QeNP2af/5wyOHYaLvDxn72n4xbMbJNqRiKExZJM8MnynebnqnoaJoojbtue7roCl/XcnjX6Of2+oc7hS44S45Q=="],
+    "gitlab-ai-provider": ["[email protected].2", "", { "dependencies": { "@anthropic-ai/sdk": "^0.71.0", "@anycable/core": "^0.9.2", "graphql-request": "^6.1.0", "isomorphic-ws": "^5.0.0", "openai": "^6.16.0", "socket.io-client": "^4.8.1", "vscode-jsonrpc": "^8.2.1", "zod": "^3.25.76" }, "peerDependencies": { "@ai-sdk/provider": ">=2.0.0", "@ai-sdk/provider-utils": ">=3.0.0" } }, "sha512-EiAipDMa4Ngsxp4MMaua5YHWsHhc9kGXKmBxulJg1Gueb+5IZmMwxaVtgWTGWZITxC3tzKEeRt/3U4McE2vTIA=="],
 
     "glob": ["[email protected]", "", { "dependencies": { "minimatch": "^10.2.1", "minipass": "^7.1.2", "path-scurry": "^2.0.0" } }, "sha512-BzXxZg24Ibra1pbQ/zE7Kys4Ua1ks7Bn6pKLkVPZ9FZe4JQS6/Q7ef3LG1H+k7lUf5l4T3PLSyYyYJVYUvfgTw=="],
 

packages/opencode/package.json

@@ -121,7 +121,7 @@
     "drizzle-orm": "catalog:",
     "effect": "catalog:",
     "fuzzysort": "3.1.0",
-    "gitlab-ai-provider": "5.3.1",
+    "gitlab-ai-provider": "5.3.2",
     "glob": "13.0.5",
     "google-auth-library": "10.5.0",
     "gray-matter": "4.0.3",

packages/opencode/src/session/llm.ts

@@ -113,17 +113,20 @@ export namespace LLM {
       options.instructions = system.join("\n")
     }
 
+    const isWorkflow = language instanceof GitLabWorkflowLanguageModel
     const messages = isOpenaiOauth
       ? input.messages
-      : [
-          ...system.map(
-            (x): ModelMessage => ({
-              role: "system",
-              content: x,
-            }),
-          ),
-          ...input.messages,
-        ]
+      : isWorkflow
+        ? input.messages
+        : [
+            ...system.map(
+              (x): ModelMessage => ({
+                role: "system",
+                content: x,
+              }),
+            ),
+            ...input.messages,
+          ]
 
     const params = await Plugin.trigger(
       "chat.params",
@@ -190,6 +193,7 @@ export namespace LLM {
     // and results sent back over the WebSocket.
     if (language instanceof GitLabWorkflowLanguageModel) {
       const workflowModel = language
+      workflowModel.systemPrompt = system.join("\n")
       workflowModel.toolExecutor = async (toolName, argsJson, _requestID) => {
         const t = tools[toolName]
         if (!t || !t.execute) {