MCP Inspector is a diagnostic tool for exploring MCP servers, not a production service tool. Its 8 tools have consistent naming (verb_noun pattern) and minimal but present descriptions. However, schemas are sparse, most tools have empty input objects or minimal parameter documentation. The tool set is narrow and introspective (list/read resources, prompts, tools; call tools; set logging), reflecting its purpose as an inspector rather than a domain-specific service. Parameter descriptions are absent for most inputs. Error handling and output schemas are not documented. This is a SUPPORT/DEBUG tool, not a user-facing service tool, which contextualizes the lower definition quality score.

• Document output schemas for all tools. Specify the structure returned by tools/list (tool array with fields: name, description, inputSchema), resources/list (resource array with: uri, name, description, mimeType), prompts/list (prompt array with: name, description, arguments), tools/call (result field with tool output), resources/read (contents array with: uri, mimeType, text or blob), prompts/get (messages array with role/content structure).
• Add error recovery guidance to tool descriptions. E.g., tools/call: 'On tool execution failure, examine the error message. If the tool name is invalid, call tools/list to confirm the name and try again.' resources/read: 'If a URI is invalid, call resources/list first to enumerate valid URIs.'
• Formalize parameter constraints in JSON Schema. For logging/setLevel, add `"enum": ["debug", "info", "notice", "warning", "error", "alert", "emergency"]` to the 'level' parameter schema.
• Enhance descriptions for tools/call and prompts/get to explain the expected structure of the 'args' object. Either accept it as additionalProperties: true with a hint ('Pass any key-value pairs expected by the target tool'), or list required subfields if applicable.
• Rename logging/setLevel to logging_set_level for consistency with MCP naming conventions (snake_case, verb_noun). Consider whether server-side logging is still needed in light of MCP spec updates; if so, update implementation to use OpenTelemetry or stderr logging instead.
• Expand descriptions to 100-200 characters. E.g., tools/list could be: 'List all available tools from the connected MCP server. Returns tool names, descriptions, and input schemas. Use this to discover capabilities before calling tools/call.'

Inferred effective spec: 2025-06-18+.

• Relies on Sampling (deprecated) - integrate directly with the LLM provider API