fix(tools): avoid duplicate run_code result views

packages/core/tools/src/code-mode.ts

@@ -370,10 +370,8 @@ export function createRunCodeTool(registry: ToolRegistry, requireRuntime: () =>
       kind: 'execute',
       rawInput: args.code,
     }),
-    // Title omitted on the result: an update replaces only the fields it
-    // carries, so the pending card's program title persists through
-    // completion. The durable final content already includes logs plus the
-    // return value, failure, or post-policy spill preview.
-    presentResult: (_args, result) => ({ card: 'generic', content: result.content }),
+    // Deliberately no presentResult: the generic surface fallback keeps this
+    // title and reads durable result content without duplicating a large raw
+    // result into the host view payload.
   })
 }

packages/core/tools/tests/code-mode.spec.ts

@@ -709,27 +709,41 @@ describe('the run_code dispatch bridge', () => {
   })
 
   it.each([
-    ['logs only', 'printed', false],
-    ['result only', 'returned', false],
-    ['logs plus result', 'printed\nreturned', false],
-    ['no output', '(run_code completed with no output)', false],
-    ['spilled result', 'HEAD\n\n(Omitted 100 bytes. Full formatted result stored at: /tmp/run-code.txt.)\n\nTAIL', false],
-  ] as const)('presents %s from the final post-policy content', async (_name, text, isError) => {
-    const { ctx } = await setup({ mode: 'code' })
+    ['logs only', { logs: ['printed'] }, 'printed'],
+    ['result only', { logs: [], value: 'returned' }, 'returned'],
+    ['logs plus result', { logs: ['printed'], value: 'returned' }, 'printed\nreturned'],
+    ['no output', { logs: [] }, '(run_code completed with no output)'],
+  ] as [string, CodeRunResult, string][])('keeps %s in durable content without a result presenter', async (_name, output, text) => {
+    const { ctx, runtime } = await setup({ mode: 'code' })
+    runtime.behavior = () => Promise.resolve(output)
+
+    const result = await runCode(ctx, 'return 1')
     const tool = ctx.tools.get(RUN_CODE_NAME)!
-    // The result omits the title — an update replaces only provided fields,
-    // so the pending card's program title persists through completion.
-    const content = [{ type: 'text' as const, text }]
-    expect(tool.presentResult?.({ code: 'return 1' }, {
-      content,
-      isError,
-      // Stale or unrelated metadata must not replace the authoritative
-      // post-policy content used by the card.
-      meta: { logs: ['stale logs-only projection'] },
-    })).toEqual({ card: 'generic', content })
+
+    expect(result.content).toEqual([{ type: 'text', text }])
+    // Surfaces keep the pending program title and render this durable content
+    // through their generic fallback. Omitting a result view also prevents the
+    // host frame from carrying the same raw content a second time.
+    expect('presentResult' in tool).toBe(false)
   })
 
-  it('presents failure content produced by the canonical execution pipeline', async () => {
+  it('keeps a post-policy spill preview in durable content without a result presenter', async () => {
+    const { ctx, runtime } = await setup({ mode: 'code' })
+    const preview = 'HEAD\n\n(Omitted 100 bytes. Full formatted result stored at: /tmp/run-code.txt.)\n\nTAIL'
+    runtime.behavior = () => Promise.resolve({ logs: ['printed'], value: 'returned' })
+    ctx.on('tools/post-execute', (exec, _result, next): Promise<PostToolDecision> => {
+      if (exec.name !== RUN_CODE_NAME) return next()
+      return Promise.resolve({ kind: 'accept', content: [{ type: 'text', text: preview }] })
+    })
+
+    const result = await runCode(ctx, 'return 1')
+    const tool = ctx.tools.get(RUN_CODE_NAME)!
+
+    expect(result.content).toEqual([{ type: 'text', text: preview }])
+    expect('presentResult' in tool).toBe(false)
+  })
+
+  it('keeps canonical failure content durable without a result presenter', async () => {
     const { ctx, runtime } = await setup({ mode: 'code' })
     runtime.behavior = () => Promise.resolve({
       logs: ['captured before failure'],
@@ -744,10 +758,7 @@ describe('the run_code dispatch bridge', () => {
       type: 'text',
       text: 'Error: code run failed (output-limit): outer output exceeded 8 bytes\nCaptured output:\ncaptured before failure',
     }])
-    expect(tool.presentResult?.({ code: 'return 1' }, result)).toEqual({
-      card: 'generic',
-      content: result.content,
-    })
+    expect('presentResult' in tool).toBe(false)
   })
 
   it('renders non-text sub-result blocks as placeholders and truncates long event summaries', async () => {

packages/host/runtime/tests/api-proxy-view.spec.ts

@@ -1,8 +1,9 @@
 /**
  * Tool-card view computation over the mux live path: three standard card types
- * arrive on the frame, a presenterless tool ships no view field, and a throwing
- * presenter soft-falls to no view (the event still ships). Result pairing works
- * both through the live open-call table and the backscan fallback after
+ * arrive on the frame, a presenterless tool ships no view field, a call-only
+ * presenter keeps raw result content out of the view payload, and a throwing
+ * presenter soft-falls to no view (the event still ships). Result pairing
+ * works both through the live open-call table and the backscan fallback after
  * turn/end cleared it.
  */
 
@@ -50,6 +51,9 @@ async function harness(): Promise<{ ctx: Context }> {
   ctx.tools.register(tool('diffy', {
     presentCall: () => ({ card: 'diff', title: 'Write f.txt', diffs: [{ path: 'f.txt', oldText: null, newText: 'x' }] }),
   }))
+  ctx.tools.register(tool('call-only', {
+    presentCall: () => ({ card: 'generic', title: 'program', kind: 'execute', rawInput: 'return value' }),
+  }))
   ctx.tools.register(tool('plain', {}))
   ctx.tools.register(tool('boom', {
     presentCall: () => { throw new Error('presenter exploded') },
@@ -73,13 +77,16 @@ describe('mux live view computation', () => {
     const api = createApiProxy(ctx, { provider: 'p', model: 'm', cwd: '/tmp' })
     const abort = new AbortController()
     const stream = api.events.mux({ rpcId: RpcId('t-mux'), payload: {} }, abort.signal)
-    const collected = collect(stream, 7, abort)
+    const collected = collect(stream, 9, abort)
+    const rawResult = `RAW_RESULT:${'x'.repeat(64 * 1024)}`
 
     const session = ctx.sessions.create()
     session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
     session.append('tool/call', { turn: 1, step: 1, callId: CallId('c-gen'), name: 'gen', arguments: '{}' })
     session.append('tool/call', { turn: 1, step: 1, callId: CallId('c-term'), name: 'term', arguments: '{"cmd":"echo hi"}' })
     session.append('tool/call', { turn: 1, step: 1, callId: CallId('c-diff'), name: 'diffy', arguments: '{}' })
+    session.append('tool/call', { turn: 1, step: 1, callId: CallId('c-call-only'), name: 'call-only', arguments: '{}' })
+    session.append('tool/result', { turn: 1, step: 1, callId: CallId('c-call-only'), content: [{ type: 'text', text: rawResult }], isError: false }, { surfaceOp: 'append' })
     session.append('tool/call', { turn: 1, step: 1, callId: CallId('c-plain'), name: 'plain', arguments: '{}' })
     session.append('tool/call', { turn: 1, step: 1, callId: CallId('c-boom'), name: 'boom', arguments: '{}' })
     session.append('tool/result', { turn: 1, step: 1, callId: CallId('c-gen'), content: [{ type: 'text', text: 'ok' }], isError: false }, { surfaceOp: 'append' })
@@ -93,6 +100,15 @@ describe('mux live view computation', () => {
     expect(byCall.get('tool/call:c-gen')?.view).toEqual({ for: 'call', view: { card: 'generic', title: 'gen call' } })
     expect(byCall.get('tool/call:c-term')?.view).toEqual({ for: 'call', view: { card: 'terminal', title: 'echo hi' } })
     expect(byCall.get('tool/call:c-diff')?.view?.view.card).toBe('diff')
+    expect(byCall.get('tool/call:c-call-only')?.view).toEqual({
+      for: 'call',
+      view: { card: 'generic', title: 'program', kind: 'execute', rawInput: 'return value' },
+    })
+    const callOnlyResult = byCall.get('tool/result:c-call-only')
+    expect('view' in (callOnlyResult ?? {})).toBe(false)
+    const serializedResult = JSON.stringify(callOnlyResult)
+    expect(serializedResult.indexOf(rawResult)).toBeGreaterThanOrEqual(0)
+    expect(serializedResult.indexOf(rawResult)).toBe(serializedResult.lastIndexOf(rawResult))
     // No presenter → the frame carries no view property at all.
     expect('view' in (byCall.get('tool/call:c-plain') ?? {})).toBe(false)
     // Throwing presenter → soft-fall: event ships, no view.