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tomevault-io (@tomevault-io) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Fastmcp Client CLI by tomevault-io — Agent Skill

Name: Fastmcp Client CLI
Author: tomevault-io

Fastmcp Client CLI

Query and invoke tools on MCP servers using fastmcp list and fastmcp call. Use when you need to discover what tools a server offers, call tools, or integrate MCP servers into workflows. Use when this capability is needed.

tomevault-io Updated Sep 17, 2026

File contents

FastMCP CLI: List and Call

Use fastmcp list and fastmcp call to interact with any MCP server from the command line.

Listing Tools

# Remote server
fastmcp list http://localhost:8000/mcp

# Local Python file (runs via fastmcp run automatically)
fastmcp list server.py

# MCPConfig with multiple servers
fastmcp list mcp.json

# Stdio command (npx, uvx, etc.)
fastmcp list --command 'npx -y @modelcontextprotocol/server-github'

# Include full input/output schemas
fastmcp list server.py --input-schema --output-schema

# Machine-readable JSON
fastmcp list server.py --json

# Include resources and prompts
fastmcp list server.py --resources --prompts

Default output shows tool signatures and descriptions. Use --input-schema or --output-schema to include full JSON schemas, --json for structured output.

Calling Tools

# Key=value arguments (auto-coerced to correct types)
fastmcp call server.py greet name=World
fastmcp call server.py add a=3 b=4

# Single JSON object for complex/nested args
fastmcp call server.py create_item '{"name": "Widget", "tags": ["a", "b"]}'

# --input-json with key=value overrides
fastmcp call server.py search --input-json '{"query": "hello", "limit": 5}' limit=10

# JSON output for scripting
fastmcp call server.py add a=3 b=4 --json

Type coercion is automatic: limit=5 becomes an integer, verbose=true becomes a boolean, based on the tool's input schema.

Server Targets

All commands accept the same server targets:

Target	Example
HTTP/HTTPS URL	`http://localhost:8000/mcp`
Python file	`server.py`
MCPConfig JSON	`mcp.json` (must have `mcpServers` key)
Stdio command	`--command 'npx -y @mcp/server'`
Discovered name	`weather` or `source:name`

Servers configured in editor configs (Claude Desktop, Claude Code, Cursor, Gemini CLI, Goose) or project-level mcp.json can be referenced by name. Use source:name (e.g. claude-code:my-server, cursor:weather) to target a specific source. Run fastmcp discover to see available names.

For SSE servers, pass --transport sse:

fastmcp list http://localhost:8000/mcp --transport sse

Auth

HTTP targets automatically use OAuth (no-ops if the server doesn't require auth). Disable with --auth none:

fastmcp call http://server/mcp tool --auth none

Discovering Configured Servers

# See all MCP servers in editor/project configs
fastmcp discover

# Filter by source
fastmcp discover --source claude-code

# JSON output
fastmcp discover --json

Scans Claude Desktop, Claude Code, Cursor, Gemini CLI, Goose, and ./mcp.json. Sources: claude-desktop, claude-code, cursor, gemini, goose, project.

Workflow Pattern

Discover tools first, then call them:

# 1. See what servers are configured
fastmcp discover

# 2. See what tools a server has
fastmcp list weather

# 3. Call a tool
fastmcp call weather get_forecast city=London

If you call a nonexistent tool, FastMCP suggests close matches.

Converted and distributed by TomeVault — claim your Tome and manage your conversions.

---name: fastmcp-client-clidescription: Query and invoke tools on MCP servers using fastmcp list and fastmcp call. Use when you need to discover what tools a server offers, call tools, or integrate MCP servers into workflows. Use when this capability is needed.---# FastMCP CLI: List and CallUse `fastmcp list` and `fastmcp call` to interact with any MCP server from the command line.## Listing Tools```bash# Remote serverfastmcp list http://localhost:8000/mcp# Local Python file (runs via fastmcp run automatically)fastmcp list server.py# MCPConfig with multiple serversfastmcp list mcp.json# Stdio command (npx, uvx, etc.)fastmcp list --command 'npx -y @modelcontextprotocol/server-github'# Include full input/output schemasfastmcp list server.py --input-schema --output-schema# Machine-readable JSONfastmcp list server.py --json# Include resources and promptsfastmcp list server.py --resources --prompts```Default output shows tool signatures and descriptions. Use `--input-schema` or `--output-schema` to include full JSON schemas, `--json` for structured output.## Calling Tools```bash# Key=value arguments (auto-coerced to correct types)fastmcp call server.py greet name=Worldfastmcp call server.py add a=3 b=4# Single JSON object for complex/nested argsfastmcp call server.py create_item '{"name": "Widget", "tags": ["a", "b"]}'# --input-json with key=value overridesfastmcp call server.py search --input-json '{"query": "hello", "limit": 5}' limit=10# JSON output for scriptingfastmcp call server.py add a=3 b=4 --json```Type coercion is automatic: `limit=5` becomes an integer, `verbose=true` becomes a boolean, based on the tool's input schema.## Server TargetsAll commands accept the same server targets:| Target | Example ||--------|---------|| HTTP/HTTPS URL | `http://localhost:8000/mcp` || Python file | `server.py` || MCPConfig JSON | `mcp.json` (must have `mcpServers` key) || Stdio command | `--command 'npx -y @mcp/server'` || Discovered name | `weather` or `source:name` |Servers configured in editor configs (Claude Desktop, Claude Code, Cursor, Gemini CLI, Goose) or project-level `mcp.json` can be referenced by name. Use `source:name` (e.g. `claude-code:my-server`, `cursor:weather`) to target a specific source. Run `fastmcp discover` to see available names.For SSE servers, pass `--transport sse`:```bashfastmcp list http://localhost:8000/mcp --transport sse```## AuthHTTP targets automatically use OAuth (no-ops if the server doesn't require auth). Disable with `--auth none`:```bashfastmcp call http://server/mcp tool --auth none```## Discovering Configured Servers```bash# See all MCP servers in editor/project configsfastmcp discover# Filter by sourcefastmcp discover --source claude-code# JSON outputfastmcp discover --json```Scans Claude Desktop, Claude Code, Cursor, Gemini CLI, Goose, and `./mcp.json`. Sources: `claude-desktop`, `claude-code`, `cursor`, `gemini`, `goose`, `project`.## Workflow PatternDiscover tools first, then call them:```bash# 1. See what servers are configuredfastmcp discover# 2. See what tools a server hasfastmcp list weather# 3. Call a toolfastmcp call weather get_forecast city=London```If you call a nonexistent tool, FastMCP suggests close matches.---> Converted and distributed by [TomeVault](https://tomevault.io/claim/jlowin) — claim your Tome and manage your conversions.

Frequently asked questions