diff --git a/apps/sim/app/invite/[id]/invite.tsx b/apps/sim/app/invite/[id]/invite.tsx
index caa2659d47..10658d8f7f 100644
--- a/apps/sim/app/invite/[id]/invite.tsx
+++ b/apps/sim/app/invite/[id]/invite.tsx
@@ -200,7 +200,7 @@ export default function Invite() {
   }, [searchParams, inviteId])
 
   useEffect(() => {
-    if (!session?.user || !token) return
+    if (!session?.user) return
 
     async function fetchInvitationDetails() {
       setIsLoading(true)
@@ -301,7 +301,7 @@ export default function Invite() {
     }
 
     fetchInvitationDetails()
-  }, [session?.user, inviteId, token])
+  }, [session?.user, inviteId])
 
   const handleAcceptInvitation = async () => {
     if (!session?.user) return
diff --git a/apps/sim/hooks/queries/oauth/oauth-connections.ts b/apps/sim/hooks/queries/oauth/oauth-connections.ts
index bdf5855165..c67391a7ce 100644
--- a/apps/sim/hooks/queries/oauth/oauth-connections.ts
+++ b/apps/sim/hooks/queries/oauth/oauth-connections.ts
@@ -107,6 +107,9 @@ async function fetchOAuthConnections(signal?: AbortSignal): Promise<ServiceInfo[
 
     return updatedServices
   } catch (error) {
+    if (error instanceof DOMException && error.name === 'AbortError') {
+      return defineServices()
+    }
     logger.error('Error fetching OAuth connections:', error)
     return defineServices()
   }
diff --git a/apps/sim/lib/copilot/orchestrator/tool-executor/integration-tools.ts b/apps/sim/lib/copilot/orchestrator/tool-executor/integration-tools.ts
index 17da0e965c..11e5e8f772 100644
--- a/apps/sim/lib/copilot/orchestrator/tool-executor/integration-tools.ts
+++ b/apps/sim/lib/copilot/orchestrator/tool-executor/integration-tools.ts
@@ -1,6 +1,7 @@
 import { db } from '@sim/db'
 import { account } from '@sim/db/schema'
-import { and, eq } from 'drizzle-orm'
+import { createLogger } from '@sim/logger'
+import { eq } from 'drizzle-orm'
 import type {
   ExecutionContext,
   ToolCallResult,
@@ -8,6 +9,8 @@ import type {
 } from '@/lib/copilot/orchestrator/types'
 import { isHosted } from '@/lib/core/config/feature-flags'
 import { generateRequestId } from '@/lib/core/utils/request'
+import { getCredentialActorContext } from '@/lib/credentials/access'
+import { getAccessibleOAuthCredentials } from '@/lib/credentials/environment'
 import { getEffectiveDecryptedEnv } from '@/lib/environment/utils'
 import { getWorkflowById } from '@/lib/workflows/utils'
 import { refreshTokenIfNeeded } from '@/app/api/auth/oauth/utils'
@@ -16,6 +19,8 @@ import { executeTool } from '@/tools'
 import type { ToolConfig } from '@/tools/types'
 import { resolveToolId } from '@/tools/utils'
 
+const logger = createLogger('CopilotIntegrationTools')
+
 export async function executeIntegrationToolDirect(
   toolCall: ToolCallState,
   toolConfig: ToolConfig,
@@ -34,40 +39,86 @@ export async function executeIntegrationToolDirect(
   const decryptedEnvVars =
     context.decryptedEnvVars || (await getEffectiveDecryptedEnv(userId, workspaceId))
 
-  // Deep resolution walks nested objects to replace {{ENV_VAR}} references.
-  // Safe because tool arguments originate from the LLM (not direct user input)
-  // and env vars belong to the user themselves.
   const executionParams = resolveEnvVarReferences(toolArgs, decryptedEnvVars, {
     deep: true,
   }) as Record<string, unknown>
 
+  // If the LLM passed a credential/oauthCredential ID directly, verify the user
+  // has active credential_member access before proceeding. This prevents
+  // unauthorized credential usage even if the agent hallucinated or received
+  // a credential ID the user doesn't have access to.
+  const suppliedCredentialId = (executionParams.oauthCredential || executionParams.credential) as
+    | string
+    | undefined
+  if (suppliedCredentialId) {
+    const actorCtx = await getCredentialActorContext(suppliedCredentialId, userId)
+    if (!actorCtx.member) {
+      logger.warn('Blocked credential use: user lacks credential_member access', {
+        credentialId: suppliedCredentialId,
+        userId,
+        toolName,
+      })
+      return {
+        success: false,
+        error: `You do not have access to credential "${suppliedCredentialId}". Ask the credential admin to add you as a member, or connect your own account.`,
+      }
+    }
+  }
+
   if (toolConfig.oauth?.required && toolConfig.oauth.provider) {
     const provider = toolConfig.oauth.provider
-    const accounts = await db
-      .select()
-      .from(account)
-      .where(and(eq(account.providerId, provider), eq(account.userId, userId)))
-      .limit(1)
 
-    if (!accounts.length) {
-      return {
-        success: false,
-        error: `No ${provider} account connected. Please connect your account first.`,
+    // If the user already supplied a credential ID that passed the check above,
+    // skip auto-resolution and let executeTool handle it via the token endpoint.
+    if (!suppliedCredentialId) {
+      if (!workspaceId) {
+        return {
+          success: false,
+          error: `Cannot resolve ${provider} credential without a workspace context.`,
+        }
       }
-    }
 
-    const acc = accounts[0]
-    const requestId = generateRequestId()
-    const { accessToken } = await refreshTokenIfNeeded(requestId, acc, acc.id)
+      const accessibleCreds = await getAccessibleOAuthCredentials(workspaceId, userId)
+      const match = accessibleCreds.find((c) => c.providerId === provider)
 
-    if (!accessToken) {
-      return {
-        success: false,
-        error: `OAuth token not available for ${provider}. Please reconnect your account.`,
+      if (!match) {
+        return {
+          success: false,
+          error: `No accessible ${provider} account found. You either don't have a ${provider} account connected in this workspace, or you don't have access to the existing one. Please connect your own account.`,
+        }
       }
-    }
 
-    executionParams.accessToken = accessToken
+      // Resolve the credential to its underlying account for token refresh
+      const matchCtx = await getCredentialActorContext(match.id, userId)
+      const accountId = matchCtx.credential?.accountId
+      if (!accountId) {
+        return {
+          success: false,
+          error: `OAuth account for ${provider} not found. Please reconnect your account.`,
+        }
+      }
+
+      const [acc] = await db.select().from(account).where(eq(account.id, accountId)).limit(1)
+
+      if (!acc) {
+        return {
+          success: false,
+          error: `OAuth account for ${provider} not found. Please reconnect your account.`,
+        }
+      }
+
+      const requestId = generateRequestId()
+      const { accessToken } = await refreshTokenIfNeeded(requestId, acc, acc.id)
+
+      if (!accessToken) {
+        return {
+          success: false,
+          error: `OAuth token not available for ${provider}. Please reconnect your account.`,
+        }
+      }
+
+      executionParams.accessToken = accessToken
+    }
   }
 
   const hasHostedKeySupport = isHosted && !!toolConfig.hosting
@@ -82,6 +133,7 @@ export async function executeIntegrationToolDirect(
     workflowId,
     workspaceId,
     userId,
+    enforceCredentialAccess: true,
   }
 
   if (toolName === 'function_execute') {