feat(copilot): copilot mcp + server side copilot execution (#3173)

* v0

* v1

* Basic ss tes

* Ss tests

* Stuff

* Add mcp

* mcp v1

* Improvement

* Fix

* BROKEN

* Checkpoint

* Streaming

* Fix abort

* Things are broken

* Streaming seems to work but copilot is dumb

* Fix edge issue

* LUAAAA

* Fix stream buffer

* Fix lint

* Checkpoint

* Initial temp state, in the middle of a refactor

* Initial test shows diff store still working

* Tool refactor

* First cleanup pass complete - untested

* Continued cleanup

* Refactor

* Refactor complete - no testing yet

* Fix - cursor makes me sad

* Fix mcp

* Clean up mcp

* Updated mcp

* Add respond to subagents

* Fix definitions

* Add tools

* Add tools

* Add copilot mcp tracking

* Fix lint

* Fix mcp

* Fix

* Updates

* Clean up mcp

* Fix copilot mcp tool names to be sim prefixed

* Add opus 4.6

* Fix discovery tool

* Fix

* Remove logs

* Fix go side tool rendering

* Update docs

* Fix hydration

* Fix tool call resolution

* Fix

* Fix lint

* Fix superagent and autoallow integrations

* Fix always allow

* Update block

* Remove plan docs

* Fix hardcoded ff

* Fix dropped provider

* Fix lint

* Fix tests

* Fix dead messages array

* Fix discovery

* Fix run workflow

* Fix run block

* Fix run from block in copilot

* Fix lint

* Fix skip and mtb

* Fix typing

* Fix tool call

* Bump api version

* Fix bun lock

* Nuke bad files

apps/sim/executor/execution/engine.ts

@@ -4,6 +4,7 @@ import { BlockType } from '@/executor/constants'
 import type { DAG } from '@/executor/dag/builder'
 import type { EdgeManager } from '@/executor/execution/edge-manager'
 import { serializePauseSnapshot } from '@/executor/execution/snapshot-serializer'
+import type { SerializableExecutionState } from '@/executor/execution/types'
 import type { NodeExecutionOrchestrator } from '@/executor/orchestrators/node'
 import type {
   ExecutionContext,
@@ -135,6 +136,7 @@ export class ExecutionEngine {
           success: false,
           output: this.finalOutput,
           logs: this.context.blockLogs,
+          executionState: this.getSerializableExecutionState(),
           metadata: this.context.metadata,
           status: 'cancelled',
         }
@@ -144,6 +146,7 @@ export class ExecutionEngine {
         success: true,
         output: this.finalOutput,
         logs: this.context.blockLogs,
+        executionState: this.getSerializableExecutionState(),
         metadata: this.context.metadata,
       }
     } catch (error) {
@@ -157,6 +160,7 @@ export class ExecutionEngine {
           success: false,
           output: this.finalOutput,
           logs: this.context.blockLogs,
+          executionState: this.getSerializableExecutionState(),
           metadata: this.context.metadata,
           status: 'cancelled',
         }
@@ -459,6 +463,7 @@ export class ExecutionEngine {
       success: true,
       output: this.collectPauseResponses(),
       logs: this.context.blockLogs,
+      executionState: this.getSerializableExecutionState(snapshotSeed),
       metadata: this.context.metadata,
       status: 'paused',
       pausePoints,
@@ -466,6 +471,24 @@ export class ExecutionEngine {
     }
   }
 
+  private getSerializableExecutionState(snapshotSeed?: {
+    snapshot: string
+  }): SerializableExecutionState | undefined {
+    try {
+      const serializedSnapshot =
+        snapshotSeed?.snapshot ?? serializePauseSnapshot(this.context, [], this.dag).snapshot
+      const parsedSnapshot = JSON.parse(serializedSnapshot) as {
+        state?: SerializableExecutionState
+      }
+      return parsedSnapshot.state
+    } catch (error) {
+      logger.warn('Failed to serialize execution state', {
+        error: error instanceof Error ? error.message : String(error),
+      })
+      return undefined
+    }
+  }
+
   private collectPauseResponses(): NormalizedBlockOutput {
     const responses = Array.from(this.pausedBlocks.values()).map((pause) => pause.response)