Local-first MCP server inspector, smoke tester, and agent runner with a web UI, CLI, and JSON traces.
Project description
mcp-agent-tester
Local-first MCP server inspector, smoke tester, and agent runner with a small web UI, CLI commands, and JSON traces.
What It Does
mcp-agent-tester can connect to an MCP server over Streamable HTTP, SSE, or stdio and:
- inspect tools, prompts, and resources
- run safe smoke tests based on explicit tool policies
- run an agent against the server using Codex CLI, Claude Code, or Cursor agent
- stream live events into the UI
- write per-run traces under
runs/
Quickstart
pip install mcp-agent-tester
mcp-agent-tester ui
Open http://127.0.0.1:8765, enter an MCP server URL or stdio command, and choose
inspect, smoke, or agent.
Or from source:
pip install uv
uv sync
uv run mcp-agent-tester ui
You can also run from the CLI:
mcp-agent-tester inspect --profile profiles/example.yaml
mcp-agent-tester smoke --profile profiles/example.yaml
mcp-agent-tester agent --profile profiles/example.yaml "Summarize what this MCP server exposes."
Profiles
Profiles are YAML files that describe server connection details and safe smoke-test
policies. Start from profiles/example.yaml and add your own local file:
server:
name: my-mcp-server
transport: http
endpoint: http://localhost:8080/mcp
tools:
default_policy: list_only
policies:
example_read_only_tool:
policy: safe_with_args
args:
limit: 5
Local overrides such as *.local.yaml are ignored by git.
Agent Runners
- Codex CLI: used by default for agent runs
- Claude Code: select the Claude agent in the UI
- Cursor agent: select Cursor in the UI and sign in when prompted
Requirements
- Python 3.11+
uv- Optional: Codex CLI, Claude Code CLI, or Cursor agent CLI for agent runs
License
MIT
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