fix(workflow): render agent tool chip names from static sources, not stored title

Tool entries in an agent block's inputs carry a mutable `title` in workflow
state, which copilot edits (edit_workflow) could rewrite to change what the
UI displays. Derive chip names from static/canonical sources instead: the
block registry name for integration tools (raw type id if unregistered),
the custom-tool record over the stored snapshot, the live MCP tool name,
and a static literal for workflow-as-tool. The stored `title` still persists
in state; the UI just no longer reads it for registry-backed tools.

Covers both render paths: the expanded tool-input chips and the collapsed
canvas summary (resolveToolsLabel, also used by workflow preview).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: j15z

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/tool-input/tool-input.tsx

@@ -1747,6 +1747,17 @@ export const ToolInput = memo(function ToolInput({
                 )
               : []
 
+          // Display name comes from static sources (registry / canonical records),
+          // never from the workflow JSON's mutable `title`, so edits to the stored
+          // state cannot change what the UI shows.
+          const toolDisplayName = isCustomTool
+            ? resolvedCustomTool?.title || customToolTitle
+            : isMcpTool
+              ? mcpTool?.name || tool.title
+              : isWorkflowTool
+                ? 'Workflow'
+                : toolBlock?.name || tool.type
+
           const useSubBlocks = !isCustomTool && !isMcpTool && subBlocksResult?.subBlocks?.length
           const displayParams: ToolParameterConfig[] = isCustomTool
             ? customToolParams
@@ -1854,7 +1865,7 @@ export const ToolInput = memo(function ToolInput({
                     )}
                   </div>
                   <span className='truncate font-medium text-[var(--text-primary)] text-small'>
-                    {formatDisplayText((isCustomTool ? customToolTitle : tool.title) ?? '', {
+                    {formatDisplayText(toolDisplayName ?? '', {
                       workflowSearchHighlight: getToolTitleSearchHighlight(toolIndex),
                     })}
                   </span>

apps/sim/lib/workflows/subblocks/display.test.ts

@@ -113,6 +113,30 @@ describe('resolveToolsLabel', () => {
       null
     )
   })
+
+  it('ignores the stored title on registry-backed tools so state edits cannot rename them', () => {
+    const slackName = resolveToolsLabel(toolInput, [{ type: 'slack' }], [])
+    expect(slackName).not.toBe(null)
+    expect(resolveToolsLabel(toolInput, [{ type: 'slack', title: 'Renamed By Copilot' }], [])).toBe(
+      slackName
+    )
+  })
+
+  it('falls back to the raw type id for unregistered block-backed tools', () => {
+    expect(
+      resolveToolsLabel(toolInput, [{ type: 'not_a_real_block', title: 'Sneaky Title' }], [])
+    ).toBe('not_a_real_block')
+  })
+
+  it('prefers the custom tool record over the stored title', () => {
+    expect(
+      resolveToolsLabel(
+        toolInput,
+        [{ type: 'custom-tool', customToolId: 'ct-1', title: 'Renamed By Copilot' }],
+        [{ id: 'ct-1', title: 'My Tool' }]
+      )
+    ).toBe('My Tool')
+  })
 })
 
 describe('resolveSkillsLabel', () => {

apps/sim/lib/workflows/subblocks/display.ts

@@ -427,10 +427,11 @@ export function resolveVariablesLabel(
 }
 
 /**
- * Resolves a tool-input value to a tool-name summary. Stored tool entries
- * come in several historical shapes, checked in priority order: explicit
- * title, custom tool referenced by id, inline schema name, OpenAI function
- * name, then the block registry.
+ * Resolves a tool-input value to a tool-name summary. Names come from static
+ * sources first (block registry, custom-tool records) so that edits to the
+ * stored entry's `title` cannot change what the UI shows; the stored title
+ * and inline schema names are only fallbacks for shapes with no canonical
+ * source (MCP snapshots, legacy entries).
  */
 export function resolveToolsLabel(
   subBlock: SubBlockConfig | undefined,
@@ -445,31 +446,32 @@ export function resolveToolsLabel(
       if (!tool || typeof tool !== 'object') return null
       const t = tool as Record<string, unknown>
 
-      if (typeof t.title === 'string' && t.title) return t.title
+      if (
+        typeof t.type === 'string' &&
+        t.type !== 'custom-tool' &&
+        t.type !== 'mcp' &&
+        t.type !== 'workflow' &&
+        t.type !== 'workflow_input'
+      ) {
+        const blockConfig = getBlock(t.type)
+        if (blockConfig?.name) return blockConfig.name
+        return t.type
+      }
 
       if (t.type === 'custom-tool' && typeof t.customToolId === 'string') {
         const customTool = customTools.find((candidate) => candidate.id === t.customToolId)
         if (customTool?.title) return customTool.title
         if (customTool?.schema?.function?.name) return customTool.schema.function.name
       }
 
+      if (typeof t.title === 'string' && t.title) return t.title
+
       const schema = t.schema as { function?: { name?: string } } | undefined
       if (schema?.function?.name) return schema.function.name
 
       const fn = t.function as { name?: string } | undefined
       if (fn?.name) return fn.name
 
-      if (
-        typeof t.type === 'string' &&
-        t.type !== 'custom-tool' &&
-        t.type !== 'mcp' &&
-        t.type !== 'workflow' &&
-        t.type !== 'workflow_input'
-      ) {
-        const blockConfig = getBlock(t.type)
-        if (blockConfig?.name) return blockConfig.name
-      }
-
       return null
     })
     .filter((name): name is string => !!name)