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Start by identifying where the failure occurs: local Agentforce Vibes startup, Salesforce registration, transport or authentication, server connectivity, tool synchronization, or a timeout. Each points to a different fix. A server can appear registered or connected while its tools are unavailable because Agentforce also validates server and tool definitions.
First, identify which part is failing
“MCP server won’t start” can describe several different failures. Before changing credentials or rebuilding a server, note the exact symptom and the point at which it appears. Salesforce’s MCP for Agentforce Troubleshooting and Considerations for MCP for Agentforce documentation distinguish local setup, registration, protocol support, server response, tool validation, and latency issues.
| Symptom | Likely area to check first |
|---|---|
| Agentforce Vibes does not initialize or connect from a development workspace | Salesforce DX project, extension, org connection, local CLI or Node.js checks, proxy, and activity log |
| Agentforce cannot find a registered server | Registration location, registered URL, network reachability, and whether the server is running |
| The server appears connected but its tools are missing or unavailable | Supported transport, tool definitions, registration settings, and synchronization or validation |
| Calls fail with an authentication error | Whether the server uses a supported authentication mode and whether its credentials are correct and current |
| A tool or agent run stalls and then times out | Response time for one tool versus aggregate response time across multiple servers |
Make one change at a time and retest the same operation. This helps separate a server-side problem from an Agentforce registration or tool-definition problem.
Fix local Agentforce Vibes startup problems
If the MCP connection is being set up from Agentforce Vibes in a local Salesforce development workspace, verify the workspace prerequisites before troubleshooting a remote server. A local extension startup issue and a Salesforce-registered server issue are not necessarily the same failure.
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- Open the intended workspace. Confirm it is a Salesforce DX project and that its project root contains
sfdx-project.json. If the file is absent, you may have opened the wrong directory rather than the project root. - Check the extension. Confirm the Agentforce Vibes extension is installed and active in the editor. If it is disabled or failed to activate, address that before changing MCP server settings.
- Verify the org connection. Check that the Salesforce org connection used by the workspace is valid. An invalid or expired org connection can prevent the local workflow from completing even when an external server is healthy.
- Run the available CLI and Node.js checks. Confirm the Salesforce CLI and Node.js environment satisfy the checks shown by the extension or its activity log. Do not assume an MCP endpoint change will fix a local runtime or tooling failure.
- Account for a corporate proxy. If network access requires a proxy, configure it through Salesforce CLI rather than assuming the editor or MCP server will discover it automatically.
- Enable debug logging and inspect the activity log. If Vibes still cannot connect, use its debug logging and activity log to identify the stage that failed and the reported error. Preserve the relevant error details when escalating.
These checks apply to local Vibes setup. For a server registered for Agentforce, continue with the registration and endpoint checks below.
Register the server in the right Salesforce location
The registration path depends on who hosts the server. Registering a server in the wrong place can leave it undiscoverable or without the expected tool access.
| Server source | Registration path | What to verify |
|---|---|---|
| External or third-party MCP server | Agentforce Registry | That the server is registered there and its current endpoint and settings are correct |
| MuleSoft or Salesforce-hosted server | Create and activate it in API Catalog, then register or allowlist its tools as required | That the catalog server is active and the relevant tools have the required registration or allowlisting |
After a server URL or registration setting changes, check the active registration rather than relying on an old endpoint copied into an earlier configuration. Also confirm that the tool you expect is still advertised by the server.
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Agentforce MCP supports servers that use the Streamable HTTP transport protocol and supports either no authentication or OAuth 2.0 client credentials. A server using a different transport or an unsupported OAuth flow will not become compatible simply because its URL is reachable.
Supported authentication choices
- No authentication, when the server is designed to accept the request without credentials.
- OAuth 2.0 client credentials, with the client credentials configured correctly for the registered server.
Unsupported flows
Agentforce MCP does not support authorization-code, CIMD, DCR, JWT bearer, PKCE, or user-level authentication. If the server requires one of these flows, use a supported authentication arrangement for the integration or choose a server setup that meets the supported requirements.
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For a supported OAuth client-credentials setup, recheck the configured credentials if authentication fails. A typo, changed secret, or expired credential can cause requests to fail even when the endpoint and transport are otherwise correct.
When Agentforce cannot find the server or gets no response
Salesforce’s troubleshooting guidance for an unresponsive server starts with a basic instruction: “Check the network connection.” Then work from the endpoint outward. This order avoids spending time on tool definitions when the server cannot be reached.
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- Check network reachability. Verify that the environment making the request can reach the server. Pay particular attention to required corporate network routes or proxy settings.
- Compare the registered URL with the current endpoint. If the server moved or its endpoint changed, update the registration to the current URL.
- Confirm the expected tool still exists. The endpoint may respond while a particular tool has been removed or renamed in the server’s advertised definitions.
- Review registration settings. Ensure the configuration in Agentforce Registry or API Catalog matches the server source and current setup.
If direct connectivity and server response are confirmed but Agentforce still reports a missing tool, investigate synchronization and validation rather than repeatedly changing network settings.
Fix a connected server whose tools are unavailable
A connected-looking server does not guarantee that its actions and tool definitions are current. Salesforce scans server and tool definitions at runtime. If those definitions change, associated actions can be removed from the agent logic, leaving an apparent mismatch between connection status and usable tools.
- Inspect trace data to see which tools are in sync and which are not.
- Compare the tool definitions currently exposed by the server with the actions associated with the agent.
- After a registration or server change, remove stale actions and recreate them so they are based on the current definitions.
- Retest the affected tool and confirm in the trace that it is synchronized.
Salesforce describes MCP for Agentforce as supporting server tools only. Do not interpret a successful server connection as evidence that every MCP capability or non-tool feature is available to Agentforce.
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Use the validation bypass only as a temporary test
If you need to determine whether tool validation itself is causing the problem, Salesforce documents a diagnostic bypass: add the named-credential header x-sfdc-mcp-feature-no-tool-validation: true and test. Treat this only as a temporary diagnostic. Remove the header before activation; it is not a repair for stale definitions or a setting to leave in place.
Diagnose timeouts by measuring the right operation
Salesforce Help cites two MCP-related response-time limits: a single registered tool that takes more than 60 seconds can trigger a timeout, while calls involving multiple servers have an aggregate limit of 120 seconds. The distinction matters: a slow individual tool and several slower calls accumulating across servers require different investigation.
- For one slow tool: isolate that operation and use Plan Tracer, trace logs, enhanced event logs, and Agent Analytics to identify where time is spent.
- For a run involving multiple servers: inspect the sequence and duration of the calls in the same observability tools, looking for accumulated latency rather than blaming only the final server.
- For a call that never returns: first verify server health and network connectivity, then use traces to distinguish an unavailable server from a slow response.
These are the response-time limits cited in Salesforce’s current MCP troubleshooting documentation; they are not a guarantee that every operation will finish within the limit. Reduce the work performed by a slow tool or investigate the slow server-side operation indicated by the traces.
Test the MCP call outside the agent
Before involving an LLM, use Postman to call the MCP tool directly and inspect the raw JSON response. A direct call can help establish whether authentication, connectivity, and the tool response work independently of model behavior. If the request fails there too, focus on the endpoint, server, transport, credentials, and network. If it succeeds but the agent cannot use the tool, focus on registration, validation, synchronization, and agent logic.
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Common errors and what to check
| What you see | Likely cause | Next check or fix |
|---|---|---|
| Server not found | Incorrect registration location, changed URL, or endpoint not reachable | Verify the Registry or API Catalog path for the server source, compare the active URL, and check network connectivity |
| No response from server | Server is stopped, network path is blocked, or endpoint is wrong | Check server health and reachability before changing tool actions |
| Authentication fails | Incorrect or expired credentials, or an unsupported authentication flow | Confirm no-auth or OAuth 2.0 client credentials is being used and refresh incorrect credentials |
| Server connects, but tool is missing | Tool definition changed, is no longer advertised, or is out of sync with the associated action | Inspect trace synchronization data and recreate stale actions after checking the current definitions |
| Tool-validation error | Validation may be involved, but the underlying definition may also be stale | Use the documented bypass header only for diagnosis, then remove it before activation and correct the definition or action |
| One operation times out | A registered tool exceeds the cited 60-second limit | Use Plan Tracer, trace logs, enhanced event logs, and Agent Analytics to isolate that operation |
| Several-server run times out | The combined calls exceed the cited 120-second aggregate limit | Inspect the calls and their durations together in the available tracing and analytics tools |
| Vibes fails before a remote call | Local workspace, extension, org, CLI/Node.js, or proxy setup issue | Check the DX project root, extension, org connection, CLI and Node.js checks, proxy configuration, and activity log |
A practical recovery order
- Classify the failure as local Vibes, registration, compatibility, connectivity, tool synchronization, or timeout.
- For local Vibes, verify the DX project and local prerequisites before changing the remote server.
- For a registered server, confirm the correct Salesforce registration path, endpoint, Streamable HTTP transport, and supported authentication.
- Prove the server responds and the tool returns raw JSON through a direct Postman call.
- If Agentforce still cannot use the tool, inspect traces for synchronization and recreate stale actions.
- For slow calls, use Salesforce observability tools to locate the slow operation or accumulated latency.
- Remove the temporary validation-bypass header before activating the configuration.
This sequence narrows the fault domain without treating every startup failure as a credential problem. Keep the error message, active registration details, and relevant trace or activity-log output together when escalating the issue.
Frequently Asked Questions
Does Agentforce MCP support MCP resources or prompts?
Salesforce’s considerations documentation states that MCP for Agentforce supports server tools only.
Can a server that uses OAuth authorization code be connected directly?
No. The supported choices are no authentication or OAuth 2.0 client credentials; authorization-code flow is listed as unsupported.
Can a successful Postman call prove the agent action is synchronized?
No. A direct call verifies the server interaction independently; inspect Agentforce trace data for tool synchronization.
Quick Recap
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Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errors
