TsgcWSAPIClient_MCP › Events

TsgcWSAPIClient_MCP Events

Events you can handle, grouped by purpose, followed by the full alphabetical list.

Session

Name	Description
OnMCPInitialize	Fires when the server replies to the initialize handshake; inspect capabilities and set Accept := False to abort.
OnMCPPing	Fires when the server acknowledges a ping. Useful for round-trip telemetry.
OnMCPStreamMessage	Fires while streaming responses are being read; inspect the raw JSON fragment and set Cancel := True to abort the stream.

Tools

Name	Description
OnMCPListTools	Receives the tools catalogue returned by tools/list.
OnMCPResponseTool	Delivers the result of a tools/call invocation.

Prompts

Name	Description
OnMCPListPrompts	Receives the prompt templates catalogue returned by prompts/list.
OnMCPResponsePrompt	Delivers the rendered prompt content returned by prompts/get.

Resources

Name	Description
OnMCPListResources	Receives the resources catalogue returned by resources/list.
OnMCPResponseResource	Delivers the payload returned by resources/read, including streamed chunks.

Server-initiated

Name	Description
OnMCPListRoots	Fires when the server asks the client for its filesystem roots (roots/list).
OnMCPSamplingCreateMessage	Fires when the server asks the client to sample an LLM (sampling/createMessage).
OnMCPElicitationCreate	Fires when the server asks the user for additional input (elicitation/create).

Protocol 2026-07-28

Name	Description
OnMCPDiscover	Fires when the server answers server/discover; set Accept := False to reject the server.
OnMCPListChanged	Fires when the server notifies that the tools, prompts or resources list changed.
OnMCPInputRequired	Fires when the server answers with input_required and the client must provide the requested inputs.

Subscriptions

Name	Description
OnMCPSubscriptionAcknowledged	Fires when the server accepts a subscription opened with subscriptions/listen.
OnMCPSubscriptionClosed	Fires when a subscription ends.
OnMCPResourcesUpdated	Fires when a watched resource changed (notifications/resources/updated).

Tasks

Name	Description
OnMCPTaskCreated	Fires when a tools/call returns a task handle instead of the tool result.
OnMCPTaskStatus	Fires when the status of a task changes.
OnMCPTaskCompleted	Fires when a task reaches a terminal status (completed, failed or cancelled).

Authorization

Name	Description
OnMCPAuthorizationURL	Fires with the URL the user must open to authorize the client.
OnMCPAuthorizationCredentials	Fires to load or store the credentials of an authorization server.

All Events (alphabetical)

Name	Description
OnMCPAuthorizationCredentials	Fires to load or store the credentials of an authorization server.
OnMCPAuthorizationURL	Fires with the URL the user must open to authorize the client.
OnMCPDiscover	Fires when the server answers server/discover; set Accept := False to reject the server.
OnMCPElicitationCreate	Fires when the server asks the user for additional input (elicitation/create).
OnMCPInitialize	Fires when the server replies to the initialize handshake; inspect capabilities and set Accept := False to abort.
OnMCPInputRequired	Fires when the server answers with input_required and the client must provide the requested inputs.
OnMCPListChanged	Fires when the server notifies that the tools, prompts or resources list changed.
OnMCPListPrompts	Receives the prompt templates catalogue returned by prompts/list.
OnMCPListResources	Receives the resources catalogue returned by resources/list.
OnMCPListRoots	Fires when the server asks the client for its filesystem roots (roots/list).
OnMCPListTools	Receives the tools catalogue returned by tools/list.
OnMCPPing	Fires when the server acknowledges a ping. Useful for round-trip telemetry.
OnMCPResourcesUpdated	Fires when a watched resource changed (notifications/resources/updated).
OnMCPResponsePrompt	Delivers the rendered prompt content returned by prompts/get.
OnMCPResponseResource	Delivers the payload returned by resources/read, including streamed chunks.
OnMCPResponseTool	Delivers the result of a tools/call invocation.
OnMCPSamplingCreateMessage	Fires when the server asks the client to sample an LLM (sampling/createMessage).
OnMCPStreamMessage	Fires while streaming responses are being read; inspect the raw JSON fragment and set Cancel := True to abort the stream.
OnMCPSubscriptionAcknowledged	Fires when the server accepts a subscription opened with subscriptions/listen.
OnMCPSubscriptionClosed	Fires when a subscription ends.
OnMCPTaskCompleted	Fires when a task reaches a terminal status (completed, failed or cancelled).
OnMCPTaskCreated	Fires when a tools/call returns a task handle instead of the tool result.
OnMCPTaskStatus	Fires when the status of a task changes.