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MCP Client Compatibility Probe

by kascada
OverviewSchemaRelated ServersScoreDiscussions
JavaScript
Local

Server Configuration

Describes the environment variables required to run the server.

NameRequiredDescriptionDefault
MCP_PROBE_TRACENoPath to the trace log file (NDJSON). Defaults to /tmp/mcp-probe.ndjson./tmp/mcp-probe.ndjson

Capabilities

Features and capabilities supported by this server

CapabilityDetails
tools
{
  "listChanged": true
}
prompts
{
  "listChanged": true
}
resources
{
  "subscribe": false,
  "listChanged": true
}

Tools

Functions exposed to the LLM to take actions

NameDescription
echo_metaA

Returns the received arguments and MCP request metadata. Use this first to inspect protocolVersion, clientInfo, and clientCapabilities.

structured_resultB

Returns both text content and structuredContent conforming to outputSchema.

create_handleA

Creates an explicit short-lived probe handle to test stateless multi-call tool design.

use_handleC

Uses a handle returned by create_handle. Unknown handles return a tool execution error.

needs_form_inputA

Returns resultType input_required until the client retries with inputResponses. This tests MRTR and elicitation form mode.

tool_errorA

Always returns a tool execution error via isError true, not a JSON-RPC protocol error.

resource_link_resultC

Returns a resource_link content item pointing at a probe resource.

searchA

ChatGPT-compatible read-only search stub. Returns result IDs, titles, and URLs. Use fetch to retrieve full text.

fetchA

ChatGPT-compatible read-only fetch stub. Retrieves full text for an ID returned by search.

Prompts

Interactive templates invoked by user choice

NameDescription
probe_summaryPrompt template that asks the model to summarize observed MCP client behavior.

Resources

Contextual data attached and managed by the client

NameDescription
overviewShort overview resource exposed by the probe server.
client-observationChecklist for interpreting the probe trace log.

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