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Test Model Context Protocol (MCP) servers using the MCP Inspector CLI
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General-purpose guidance for Claude Code (terminal) and Claude Dev (platform). Covers stable principles (progressive disclosure, hooks, security) and volatile details with lookup workflows.
| name | mcp-inspector |
| description | Test Model Context Protocol (MCP) servers using the MCP Inspector CLI |
Quick testing for MCP servers (stdio, HTTP, SSE). Run Inspector CLI commands to validate tools, resources, and prompts.
# Basic tool test (local server)
npx @modelcontextprotocol/inspector --cli node build/index.js --method tools/list
# Call a tool
npx @modelcontextprotocol/inspector --cli node build/index.js \
--method tools/call --tool-name mytool --tool-arg key=value
# Remote server (HTTP/SSE)
npx @modelcontextprotocol/inspector --cli https://server.com --method tools/list
| Method | Purpose | Required Flags |
|---|---|---|
tools/list | List available tools | none |
tools/call | Execute a tool | --tool-name |
resources/list | List resources | none |
resources/read | Read resource content | --uri |
resources/templates/list | List resource templates | none |
prompts/list | List prompts | none |
prompts/get | Get prompt with args | --prompt-name |
Transport:
--cli - Enable non-interactive mode (required)--transport <stdio\|sse\|http> - Explicit transport type--server-url <url> - Server URL for SSE/HTTPTesting:
--method <name> - MCP method to call--tool-arg key=value - Tool arguments (repeatable)--uri <uri> - Resource URI--prompt-args key=value - Prompt arguments (repeatable)Config:
--config <path> - Load from mcp.json--server <name> - Select server from config-e KEY=VALUE - Set environment variable--header "Name: Value" - HTTP headers for remote servers/mcp → HTTP (streamable)/sse → SSESee references/ directory:
cli-flags.md - Complete flag referencetransports.md - stdio/SSE/HTTP detailstesting-methods.md - All methods with examplesconfig-files.md - mcp.json patternsknown-issues.md - Server vs CLI bugsSee examples/ directory:
julia-stdio.md - Julia server testingremote-servers.md - HTTP/SSE testing, curl, mcp-remote