diff --git a/apps/sim/lib/copilot/chat/post.test.ts b/apps/sim/lib/copilot/chat/post.test.ts
index 3c114eccba..1a6dee8a4b 100644
--- a/apps/sim/lib/copilot/chat/post.test.ts
+++ b/apps/sim/lib/copilot/chat/post.test.ts
@@ -93,10 +93,18 @@ vi.mock('@sim/db', () => ({
         })),
       })),
     })),
+    select: vi.fn(() => ({
+      from: vi.fn(() => ({
+        where: vi.fn(() => ({
+          limit: vi.fn().mockResolvedValue([{ permissionType: 'write' }]),
+        })),
+      })),
+    })),
   },
 }))
 
 vi.mock('drizzle-orm', () => ({
+  and: vi.fn(() => ({})),
   eq: vi.fn(() => ({})),
   sql: (strings: TemplateStringsArray, ...values: unknown[]) => ({ strings, values }),
 }))
diff --git a/apps/sim/lib/copilot/chat/post.ts b/apps/sim/lib/copilot/chat/post.ts
index a745f209c9..a9d1eb30ad 100644
--- a/apps/sim/lib/copilot/chat/post.ts
+++ b/apps/sim/lib/copilot/chat/post.ts
@@ -1,9 +1,9 @@
 import { type Context as OtelContext, context as otelContextApi } from '@opentelemetry/api'
 import { db } from '@sim/db'
-import { copilotChats } from '@sim/db/schema'
+import { copilotChats, permissions } from '@sim/db/schema'
 import { createLogger } from '@sim/logger'
 import { generateId } from '@sim/utils/id'
-import { eq, sql } from 'drizzle-orm'
+import { and, eq, sql } from 'drizzle-orm'
 import { type NextRequest, NextResponse } from 'next/server'
 import { z } from 'zod'
 import { isZodError, validationErrorResponse } from '@/lib/api/server'
@@ -506,14 +506,12 @@ async function resolveBranch(params: {
     }
 
     const resolvedWorkflowId = resolved.workflowId
-    let resolvedWorkspaceId = requestedWorkspaceId
-    if (!resolvedWorkspaceId) {
-      try {
-        const workflow = await getWorkflowById(resolvedWorkflowId)
-        resolvedWorkspaceId = workflow?.workspaceId ?? undefined
-      } catch {
-        // best effort; downstream calls can still proceed
-      }
+    let resolvedWorkspaceId: string | undefined
+    try {
+      const workflow = await getWorkflowById(resolvedWorkflowId)
+      resolvedWorkspaceId = workflow?.workspaceId ?? requestedWorkspaceId
+    } catch {
+      resolvedWorkspaceId = requestedWorkspaceId
     }
 
     const selectedModel = model || DEFAULT_MODEL
@@ -569,6 +567,22 @@ async function resolveBranch(params: {
     return createBadRequestResponse('workspaceId is required when workflowId is not provided')
   }
 
+  const [permissionRow] = await db
+    .select({ permissionType: permissions.permissionType })
+    .from(permissions)
+    .where(
+      and(
+        eq(permissions.userId, authenticatedUserId),
+        eq(permissions.entityType, 'workspace'),
+        eq(permissions.entityId, requestedWorkspaceId)
+      )
+    )
+    .limit(1)
+
+  if (!permissionRow) {
+    return createBadRequestResponse('Workspace not found or access denied')
+  }
+
   return {
     kind: 'workspace',
     workspaceId: requestedWorkspaceId,
diff --git a/apps/sim/lib/copilot/chat/process-contents.ts b/apps/sim/lib/copilot/chat/process-contents.ts
index 78d9b94db0..d570bab39e 100644
--- a/apps/sim/lib/copilot/chat/process-contents.ts
+++ b/apps/sim/lib/copilot/chat/process-contents.ts
@@ -116,8 +116,8 @@ export async function processContextsServer(
           currentWorkspaceId
         )
       }
-      if (ctx.kind === 'table' && ctx.tableId) {
-        const result = await resolveTableResource(ctx.tableId)
+      if (ctx.kind === 'table' && ctx.tableId && currentWorkspaceId) {
+        const result = await resolveTableResource(ctx.tableId, currentWorkspaceId)
         if (!result) return null
         return { type: 'table', tag: ctx.label ? `@${ctx.label}` : '@', content: result.content }
       }
@@ -701,7 +701,7 @@ export async function resolveActiveResourceContext(
   resourceType: string,
   resourceId: string,
   workspaceId: string,
-  _userId: string,
+  userId: string,
   chatId?: string
 ): Promise<AgentContext | null> {
   try {
@@ -709,10 +709,10 @@ export async function resolveActiveResourceContext(
       case 'workflow': {
         const ctx = await processWorkflowFromDb(
           resourceId,
-          undefined,
+          userId,
           '@active_resource',
           'current_workflow',
-          undefined,
+          workspaceId,
           chatId
         )
         if (!ctx) return null
@@ -721,7 +721,7 @@ export async function resolveActiveResourceContext(
       case 'knowledgebase': {
         const ctx = await processKnowledgeFromDb(
           resourceId,
-          undefined,
+          userId,
           '@active_resource',
           workspaceId
         )
@@ -729,7 +729,7 @@ export async function resolveActiveResourceContext(
         return { type: 'active_resource', tag: '@active_resource', content: ctx.content }
       }
       case 'table': {
-        return await resolveTableResource(resourceId)
+        return await resolveTableResource(resourceId, workspaceId)
       }
       case 'file': {
         return await resolveFileResource(resourceId, workspaceId)
@@ -745,9 +745,13 @@ export async function resolveActiveResourceContext(
     return null
   }
 }
-async function resolveTableResource(tableId: string): Promise<AgentContext | null> {
+async function resolveTableResource(
+  tableId: string,
+  workspaceId: string
+): Promise<AgentContext | null> {
   const table = await getTableById(tableId)
   if (!table) return null
+  if (table.workspaceId !== workspaceId) return null
   return {
     type: 'active_resource',
     tag: '@active_resource',
diff --git a/apps/sim/lib/data-drains/destinations/webhook.ts b/apps/sim/lib/data-drains/destinations/webhook.ts
index ba192b9943..525898e348 100644
--- a/apps/sim/lib/data-drains/destinations/webhook.ts
+++ b/apps/sim/lib/data-drains/destinations/webhook.ts
@@ -99,12 +99,11 @@ function sign(body: Buffer, secret: string, timestamp: number): string {
 function sleepUntilAborted(ms: number, signal: AbortSignal): Promise<void> {
   if (signal.aborted) return Promise.resolve()
   return new Promise((resolve) => {
-    let timeoutId: ReturnType<typeof setTimeout>
     const onAbort = () => {
       clearTimeout(timeoutId)
       resolve()
     }
-    timeoutId = setTimeout(() => {
+    const timeoutId = setTimeout(() => {
       signal.removeEventListener('abort', onAbort)
       resolve()
     }, ms)