diff --git a/apps/sim/executor/utils/delegation.test.ts b/apps/sim/executor/utils/delegation.test.ts
new file mode 100644
index 00000000000..0681054f27b
--- /dev/null
+++ b/apps/sim/executor/utils/delegation.test.ts
@@ -0,0 +1,27 @@
+/**
+ * @vitest-environment node
+ */
+import { describe, expect, it } from 'vitest'
+import { executionScopeForTarget } from '@/executor/utils/delegation'
+
+describe('executionScopeForTarget', () => {
+  it('binds the execution when the target is the running workflow', () => {
+    expect(
+      executionScopeForTarget({ workflowId: 'workflow-1', executionId: 'run-1' }, 'workflow-1')
+    ).toEqual({ executionId: 'run-1' })
+  })
+
+  it('omits the execution for a child workflow, which binds on its own id', () => {
+    expect(
+      executionScopeForTarget({ workflowId: 'parent', executionId: 'run-1' }, 'child')
+    ).toEqual({})
+  })
+
+  it('omits the execution outside an active run', () => {
+    expect(executionScopeForTarget({ workflowId: 'workflow-1' }, 'workflow-1')).toEqual({})
+  })
+
+  it('omits the execution when the context has no workflow to compare', () => {
+    expect(executionScopeForTarget({ executionId: 'run-1' }, 'workflow-1')).toEqual({})
+  })
+})
diff --git a/apps/sim/executor/utils/delegation.ts b/apps/sim/executor/utils/delegation.ts
new file mode 100644
index 00000000000..6bead347656
--- /dev/null
+++ b/apps/sim/executor/utils/delegation.ts
@@ -0,0 +1,21 @@
+import type { GenerateInternalDelegationTokenInput } from '@/lib/auth/internal'
+
+/**
+ * Binds the running execution to a delegation only when it targets the workflow that
+ * is actually running.
+ *
+ * A child workflow is a separate resource and binds on its own id, so forwarding the
+ * parent's `executionId` would assert a run that does not cover the target and the
+ * delegation would fail to bind. Callers spread the result into their delegation input.
+ *
+ * Kept free of runtime imports so client-reachable modules can read it without pulling
+ * in the executor graph.
+ */
+export function executionScopeForTarget(
+  context: { workflowId?: string; executionId?: string },
+  targetWorkflowId: string
+): Pick<GenerateInternalDelegationTokenInput, 'executionId'> {
+  return context.workflowId === targetWorkflowId && context.executionId
+    ? { executionId: context.executionId }
+    : {}
+}
diff --git a/apps/sim/providers/utils.ts b/apps/sim/providers/utils.ts
index 39cced83ab5..1cb25c7da2d 100644
--- a/apps/sim/providers/utils.ts
+++ b/apps/sim/providers/utils.ts
@@ -90,13 +90,12 @@ async function fetchWorkflowMetadata(
       throw new Error('Workflow metadata enrichment requires a trusted execution subject')
     }
     const { buildAPIUrl, buildExecutorDelegationHeaders } = await import('@/executor/utils/http')
+    const { executionScopeForTarget } = await import('@/executor/utils/delegation')
 
     const headers = await buildExecutorDelegationHeaders({
       subjectUserId: executionContext.userId,
       workflowId,
-      ...(executionContext.workflowId === workflowId && executionContext.executionId
-        ? { executionId: executionContext.executionId }
-        : {}),
+      ...executionScopeForTarget(executionContext, workflowId),
     })
     const url = buildAPIUrl(`/api/workflows/${workflowId}`)
 
diff --git a/apps/sim/tools/params.test.ts b/apps/sim/tools/params.test.ts
index 85f515345a6..1f680fd6c06 100644
--- a/apps/sim/tools/params.test.ts
+++ b/apps/sim/tools/params.test.ts
@@ -1,4 +1,4 @@
-import { afterAll, describe, expect, it, vi } from 'vitest'
+import { afterAll, beforeEach, describe, expect, it, vi } from 'vitest'
 import { mergeToolParameters } from '@/tools/merge-params'
 import * as toolMetadata from '@/tools/metadata'
 import {
@@ -18,6 +18,17 @@ import {
 } from '@/tools/params'
 import type { HttpMethod, ParameterVisibility } from '@/tools/types'
 
+const { mockBuildExecutorDelegationHeaders } = vi.hoisted(() => ({
+  mockBuildExecutorDelegationHeaders: vi
+    .fn()
+    .mockResolvedValue({ Authorization: 'Bearer delegation-token' }),
+}))
+
+vi.mock('@/executor/utils/http', () => ({
+  buildExecutorDelegationHeaders: mockBuildExecutorDelegationHeaders,
+  buildAPIUrl: (path: string) => new URL(path, 'http://localhost:3000'),
+}))
+
 const mockToolConfig = {
   id: 'test_tool',
   name: 'Test Tool',
@@ -648,6 +659,104 @@ describe('Tool Parameters Utils', () => {
       })
     })
 
+    describe('createLLMToolSchema - child workflow input enrichment', () => {
+      const childWorkflowPayload = {
+        data: {
+          state: {
+            blocks: {
+              'block-1': {
+                type: 'starter',
+                subBlocks: {
+                  inputFormat: {
+                    value: [
+                      { name: 'email', type: 'string', description: 'Recipient address' },
+                      { name: 'attempts', type: 'number' },
+                    ],
+                  },
+                },
+              },
+            },
+          },
+        },
+      }
+
+      const mockFetch = vi.fn()
+
+      beforeEach(() => {
+        mockBuildExecutorDelegationHeaders.mockClear()
+        mockFetch.mockReset()
+        mockFetch.mockResolvedValue(
+          new Response(JSON.stringify(childWorkflowPayload), {
+            status: 200,
+            headers: { 'Content-Type': 'application/json' },
+          })
+        )
+        // The suite runs with `unstubGlobals`, which restores globals between tests.
+        vi.stubGlobal('fetch', mockFetch)
+      })
+
+      it('binds the delegation to the execution subject and the target workflow', async () => {
+        const { schema } = await createLLMToolSchema(
+          mockWorkflowExecutorConfig,
+          { workflowId: 'child-workflow' },
+          {
+            userId: 'user-1',
+            workflowId: 'parent-workflow',
+            executionId: 'execution-1',
+            workspaceId: 'workspace-1',
+          }
+        )
+
+        expect(mockBuildExecutorDelegationHeaders).toHaveBeenCalledWith({
+          subjectUserId: 'user-1',
+          workflowId: 'child-workflow',
+        })
+        expect(schema.properties.inputMapping.properties).toEqual({
+          email: { type: 'string', description: 'Recipient address' },
+          attempts: { type: 'number', description: 'Input field: attempts' },
+        })
+        expect(schema.properties.inputMapping.required).toEqual(['email', 'attempts'])
+      })
+
+      it('carries the executionId when the target is the running workflow', async () => {
+        await createLLMToolSchema(
+          mockWorkflowExecutorConfig,
+          { workflowId: 'parent-workflow' },
+          { userId: 'user-1', workflowId: 'parent-workflow', executionId: 'execution-1' }
+        )
+
+        expect(mockBuildExecutorDelegationHeaders).toHaveBeenCalledWith({
+          subjectUserId: 'user-1',
+          workflowId: 'parent-workflow',
+          executionId: 'execution-1',
+        })
+      })
+
+      it('leaves inputMapping untyped and issues no request without an execution subject', async () => {
+        const { schema } = await createLLMToolSchema(
+          mockWorkflowExecutorConfig,
+          { workflowId: 'child-workflow' },
+          { workflowId: 'parent-workflow', executionId: 'execution-1' }
+        )
+
+        expect(mockBuildExecutorDelegationHeaders).not.toHaveBeenCalled()
+        expect(mockFetch).not.toHaveBeenCalled()
+        expect(schema.properties.inputMapping.properties).toBeUndefined()
+      })
+
+      it('leaves inputMapping untyped when the workflow read is rejected', async () => {
+        mockFetch.mockResolvedValue(new Response('Unauthorized', { status: 401 }))
+
+        const { schema } = await createLLMToolSchema(
+          mockWorkflowExecutorConfig,
+          { workflowId: 'child-workflow' },
+          { userId: 'user-1', workflowId: 'parent-workflow' }
+        )
+
+        expect(schema.properties.inputMapping.properties).toBeUndefined()
+      })
+    })
+
     describe('mergeToolParameters - inputMapping deep merge', () => {
       it.concurrent('should deep merge inputMapping when user provides empty object', () => {
         const userProvided = {
diff --git a/apps/sim/tools/params.ts b/apps/sim/tools/params.ts
index ebccb601991..efbca622015 100644
--- a/apps/sim/tools/params.ts
+++ b/apps/sim/tools/params.ts
@@ -699,7 +699,7 @@ export async function createLLMToolSchema(
     if (isWorkflowInputMapping) {
       const workflowId = userProvidedParams.workflowId as string
       if (workflowId) {
-        await applyDynamicSchemaForWorkflow(propertySchema, workflowId)
+        await applyDynamicSchemaForWorkflow(propertySchema, workflowId, enrichmentContext)
       }
     }
 
@@ -742,10 +742,11 @@ export async function createLLMToolSchema(
  */
 async function applyDynamicSchemaForWorkflow(
   propertySchema: SchemaProperty,
-  workflowId: string
+  workflowId: string,
+  context: WorkflowToolExecutionContext
 ): Promise<void> {
   try {
-    const workflowInputFields = await fetchWorkflowInputFields(workflowId)
+    const workflowInputFields = await fetchWorkflowInputFields(workflowId, context)
 
     if (workflowInputFields && workflowInputFields.length > 0) {
       propertySchema.type = 'object'
@@ -771,19 +772,32 @@ async function applyDynamicSchemaForWorkflow(
 
 /**
  * Fetches workflow input fields from the API.
+ *
+ * The workflow read route accepts only scoped executor delegations, so the call is
+ * bound to the acting execution subject.
  */
 async function fetchWorkflowInputFields(
-  workflowId: string
+  workflowId: string,
+  context: WorkflowToolExecutionContext
 ): Promise<Array<{ name: string; type: string; description?: string }>> {
   try {
-    const { buildAuthHeaders, buildAPIUrl } = await import('@/executor/utils/http')
-
-    const headers = await buildAuthHeaders()
+    if (!context.userId) {
+      throw new Error('Workflow input enrichment requires a trusted execution subject')
+    }
+    const { buildAPIUrl, buildExecutorDelegationHeaders } = await import('@/executor/utils/http')
+    const { executionScopeForTarget } = await import('@/executor/utils/delegation')
+
+    const headers = await buildExecutorDelegationHeaders({
+      subjectUserId: context.userId,
+      workflowId,
+      ...executionScopeForTarget(context, workflowId),
+    })
     const url = buildAPIUrl(`/api/workflows/${workflowId}`)
 
     const response = await fetch(url.toString(), { headers })
     if (!response.ok) {
-      throw new Error('Failed to fetch workflow')
+      await response.text().catch(() => {})
+      throw new Error(`Failed to fetch workflow (${response.status})`)
     }
 
     const { data } = await response.json()
diff --git a/apps/sim/tools/schema-enrichers.test.ts b/apps/sim/tools/schema-enrichers.test.ts
index f7542177272..f32dbcd60b6 100644
--- a/apps/sim/tools/schema-enrichers.test.ts
+++ b/apps/sim/tools/schema-enrichers.test.ts
@@ -3,7 +3,12 @@
  */
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 
-const { mockBuildAPIUrl, mockBuildAuthHeaders, mockExtractAPIErrorMessage } = vi.hoisted(() => ({
+const {
+  mockBuildAPIUrl,
+  mockBuildAuthHeaders,
+  mockBuildExecutorDelegationHeaders,
+  mockExtractAPIErrorMessage,
+} = vi.hoisted(() => ({
   mockBuildAPIUrl: vi.fn((path: string, params?: Record<string, string>) => {
     const url = new URL(path, 'http://localhost:3000')
     for (const [key, value] of Object.entries(params ?? {})) {
@@ -12,12 +17,14 @@ const { mockBuildAPIUrl, mockBuildAuthHeaders, mockExtractAPIErrorMessage } = vi
     return url
   }),
   mockBuildAuthHeaders: vi.fn(),
+  mockBuildExecutorDelegationHeaders: vi.fn(),
   mockExtractAPIErrorMessage: vi.fn(),
 }))
 
 vi.mock('@/executor/utils/http', () => ({
   buildAPIUrl: mockBuildAPIUrl,
   buildAuthHeaders: mockBuildAuthHeaders,
+  buildExecutorDelegationHeaders: mockBuildExecutorDelegationHeaders,
   extractAPIErrorMessage: mockExtractAPIErrorMessage,
 }))
 
@@ -106,14 +113,16 @@ describe('enrichTableToolSchema', () => {
 describe('enrichKBTagsSchema', () => {
   beforeEach(() => {
     vi.clearAllMocks()
-    mockBuildAuthHeaders.mockResolvedValue({ Authorization: 'Bearer internal-token' })
+    mockBuildExecutorDelegationHeaders.mockResolvedValue({
+      Authorization: 'Bearer delegation-token',
+    })
   })
 
   afterEach(() => {
     vi.unstubAllGlobals()
   })
 
-  it('fetches tag definitions as the acting user so the route can authorize them', async () => {
+  it('binds the tag-definition read to the acting subject and workflow execution', async () => {
     const mockFetch = vi.fn().mockResolvedValue(
       new Response(
         JSON.stringify({
@@ -125,18 +134,46 @@ describe('enrichKBTagsSchema', () => {
     )
     vi.stubGlobal('fetch', mockFetch)
 
-    const result = await enrichKBTagsSchema('kb-1', { userId: 'user-1' })
+    const result = await enrichKBTagsSchema('kb-1', {
+      userId: 'user-1',
+      workflowId: 'workflow-1',
+      executionId: 'execution-1',
+    })
 
-    expect(mockBuildAuthHeaders).toHaveBeenCalledWith('user-1')
+    expect(mockBuildExecutorDelegationHeaders).toHaveBeenCalledWith({
+      subjectUserId: 'user-1',
+      workflowId: 'workflow-1',
+      executionId: 'execution-1',
+    })
     expect(result?.properties).toEqual({ Client: { type: 'string', description: 'text tag' } })
   })
 
-  it('skips enrichment without an acting user rather than issuing an unauthorized request', async () => {
+  it('omits the executionId outside an active run', async () => {
+    const mockFetch = vi.fn().mockResolvedValue(
+      new Response(JSON.stringify({ success: true, data: [] }), {
+        status: 200,
+        headers: { 'Content-Type': 'application/json' },
+      })
+    )
+    vi.stubGlobal('fetch', mockFetch)
+
+    await enrichKBTagsSchema('kb-1', { userId: 'user-1', workflowId: 'workflow-1' })
+
+    expect(mockBuildExecutorDelegationHeaders).toHaveBeenCalledWith({
+      subjectUserId: 'user-1',
+      workflowId: 'workflow-1',
+    })
+  })
+
+  it.each([
+    ['no acting user', { workflowId: 'workflow-1' }],
+    ['no acting workflow to bind the delegation on', { userId: 'user-1' }],
+  ])('skips enrichment with %s rather than issuing an unauthorized request', async (_, context) => {
     const mockFetch = vi.fn()
     vi.stubGlobal('fetch', mockFetch)
 
-    await expect(enrichKBTagsSchema('kb-1', {})).resolves.toBeNull()
+    await expect(enrichKBTagsSchema('kb-1', context)).resolves.toBeNull()
     expect(mockFetch).not.toHaveBeenCalled()
-    expect(mockBuildAuthHeaders).not.toHaveBeenCalled()
+    expect(mockBuildExecutorDelegationHeaders).not.toHaveBeenCalled()
   })
 })
diff --git a/apps/sim/tools/schema-enrichers.ts b/apps/sim/tools/schema-enrichers.ts
index 27f91fd50f7..9c2bd7abe31 100644
--- a/apps/sim/tools/schema-enrichers.ts
+++ b/apps/sim/tools/schema-enrichers.ts
@@ -116,6 +116,10 @@ function mapFieldTypeToSchemaType(fieldType: string): string {
 /**
  * Fetches tag definitions from a knowledge base as the acting user, whose id the
  * route requires to authorize the read.
+ *
+ * The tag-definition route accepts only scoped executor delegations. The delegation
+ * binds on the running workflow — that is what resolves the workspace the knowledge
+ * base must belong to — so both the subject and the workflow are required.
  */
 async function fetchTagDefinitions(
   knowledgeBaseId: string,
@@ -125,18 +129,30 @@ async function fetchTagDefinitions(
     logger.warn(`Skipping tag definition enrichment for KB ${knowledgeBaseId}: no acting user`)
     return []
   }
+  if (!context.workflowId) {
+    logger.warn(`Skipping tag definition enrichment for KB ${knowledgeBaseId}: no acting workflow`)
+    return []
+  }
 
   try {
-    const { buildAuthHeaders, buildAPIUrl } = await import('@/executor/utils/http')
-
-    const headers = await buildAuthHeaders(context.userId)
+    const { buildAPIUrl, buildExecutorDelegationHeaders } = await import('@/executor/utils/http')
+    const { executionScopeForTarget } = await import('@/executor/utils/delegation')
+
+    const headers = await buildExecutorDelegationHeaders({
+      subjectUserId: context.userId,
+      workflowId: context.workflowId,
+      ...executionScopeForTarget(context, context.workflowId),
+    })
     const url = buildAPIUrl(`/api/knowledge/${knowledgeBaseId}/tag-definitions`)
 
     logger.info(`Fetching tag definitions for KB ${knowledgeBaseId} from ${url.toString()}`)
 
     const response = await fetch(url.toString(), { headers })
     if (!response.ok) {
-      logger.warn(`Failed to fetch tag definitions for KB ${knowledgeBaseId}: ${response.status}`)
+      await response.text().catch(() => {})
+      // Error, not warn: enrichment degrades silently, so a credential break is only
+      // ever visible here. A 401 means the delegation stopped satisfying the route.
+      logger.error(`Failed to fetch tag definitions for KB ${knowledgeBaseId}: ${response.status}`)
       return []
     }