Development
Plugin
arcade-mcp
Open-source Python framework for building MCP servers and tools.
Plugin Signal63/100Solid
maintained99
capable14
documented75
adopted64
Install
$ npx -y skills add ArcadeAI/arcade-mcp --agent claude-code
Run the curl in your terminal, the rest in Claude Code.
What's inside
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README
1
Arcade MCP
Open-source Python framework for building MCP servers and tools.
Documentation • Examples • Discord
What is arcade-mcp
arcade-mcp is the Python framework for building Model Context Protocol servers and the tools that run inside them. It powers the 7,500+ prebuilt tools across 81 MCP servers at Arcade.dev, and is open-sourced so you can build your own.
Use it when you need MCP tools that aren't already in the prebuilt catalog: internal APIs, custom OAuth providers, domain-specific integrations.
Highlights:
- Decorator API covering the full MCP spec: tools, resources, prompts, sampling, elicitation, progress, logging.
- Authorized tool calling. Declare
requires_auth=GitHub(scopes=["repo"])and Arcade handles OAuth, token refresh, and per-call scoping. The client and the LLM never see the token. - Vendor-neutral. Any MCP client, any LLM, any agent framework (LangChain, Mastra, Pydantic AI, CrewAI, Google ADK, OpenAI Agents).
arcade evalsfor testing tool-call accuracy against real LLMs.arcade deployfor one-command hosting on Arcade Cloud.
Authorized tool calling
Tools can declare:
- Which OAuth scopes they need, and Arcade handles the rest: prompting the end user to authorize, storing and refreshing tokens, scoping them per call
- API keys or any other secrets, and Arcade hosts the secrets securely in an encrypted environment.
The secrets (OAuth tokens, API keys, etc) are securely injected by Arcade into your tool call at runtime, so that your tool can authorize requests to upstream APIs, for example. The client and the LLM never see the secret values.
A tool that reads the user's GitHub repos is one decorator away:
from arcade_mcp_server import MCPApp, Context
from arcade_mcp_server.auth import GitHub
app = MCPApp(name="gh", version="1.0.0")
@app.tool(requires_auth=GitHub(scopes=["repo"]))
async def list_my_repos(context: Context) -> list[str]:
"""List the authenticated user's GitHub repositories."""
token = context.get_auth_token_or_empty()
...
When the tool is invoked through Arcade Cloud, the user is presented with a URL to complete the OAuth challenge in their browser. On success, the token is injected into context for that call. Subsequent calls reuse and refresh the token automatically.
22 helper classes ship with the framework for popular providers:
Asana, Atlassian, Attio, ClickUp, Discord, Dropbox, Figma, GitHub, Google, Hubspot, Linear, LinkedIn, Microsoft, Notion, PagerDuty, Reddit, Slack, Spotify, Twitch, X, Zoom.
For any other OAuth API, use the generic OAuth2(...) class and register your OAuth app in the Arcade Dashboard.
Quick Start
Install the CLI
uv tool install arcade-mcp
Scaffold a new server
arcade new my_server
cd my_server/src/my_server
The scaffold creates pyproject.toml, .env.example, and a server.py with example tools.
A minimal tool:
from typing import Annotated
from arcade_mcp_server import MCPApp
app = MCPApp(name="my_server", version="1.0.0")
@app.tool
def greet(name: Annotated[str, "Name to greet"]) -> str:
"""Greet a person by name."""
return f"Hello, {name}!"
if __name__ == "__main__":
app.run(transport="stdio")
Run
uv run server.py # stdio (default), for Claude Desktop and CLI tools
uv run server.py http # HTTP+SSE, for Cursor and VS Code; docs at http://127.0.0.1:8000/docs
Configure your MCP client
arcade configure claude # Claude Desktop, stdio
arcade configure cursor --transport http --port 8080 # Cursor, local HTTP on :8080
arcade configure vscode --entrypoint my_server.py # VS Code, stdio launching my_server.py
For more patterns (MCP resources, sampling, progress reporting, tool chaining, end-to-end agents, eval suites, Resource Server Auth), browse examples/mcp_servers/. Run arcade --help for the full CLI.
With Arcade Cloud
arcade login followed by arcade deploy packages your server, discovers and upserts required secrets, and polls until it's healthy on Arcade Cloud. From there, the Arcade Engine fulfills authorized tool calling flows for end users, and arcade server logs/list/status plus arcade dashboard provide observability and management.
Standalone is supported too. Run your server in any MCP client over stdio or HTTP. Supply your own access tokens for tools with requires_auth=..., and protect production HTTP endpoints with Resource Server Auth (OAuth 2.1 Bearer tokens validated against your IdP).
Install from Source
Requires Python 3.10+ and uv.
git clone https://github.com/ArcadeAI/arcade-mcp.git
cd arcade-mcp
make install
See CONTRIBUTING.md for development workflow and SECURITY.md for vulnerability reporting.
Community
- Discord: https://discord.com/invite/GUZEMpEZ9p
- X: https://x.com/TryArcade
- LinkedIn: https://www.linkedin.com/company/arcade-mcp
- Issues: https://github.com/ArcadeAI/arcade-mcp/issues
- Documentation: https://docs.arcade.dev
License
MIT. See LICENSE.
File tree
527ArcadeAI/arcade-mcpView on GitHub
.claude/
skills/
build-error-adapter/
SKILL.md
.cursor/
rules/
versioning.mdc
.editorconfig
.github/
actions/
setup-uv-env/
action.yml
dependabot.yml
ISSUE_TEMPLATE/
bug_report.md
feature_request.md
PULL_REQUEST_TEMPLATE.md
scripts/
check-version-changes.sh
sync_with_pylon.py
workflows/
check-debug-leak-flags.yml
cli-integration-no-auth.yml
main.yml
pylon-sync.yml
release-on-version-change.yml
stale.yml
test-install.yml
.gitignore
.pre-commit-config.yaml
.prettierignore
.prettierrc.toml
.ruff.toml
.vscode/
extensions.json
launch.json
settings.json
CLAUDE.md
CONTRIBUTING.md
cspell.config.yaml
examples/
docker-template/
.dockerignore
docker/
docker-compose.yml
Dockerfile
README.md
README.md
setup-docker.sh
evals/
eval_arcade_gateway.py
eval_comprehensive_comparison.py
eval_http_mcp_server.py
eval_pctx_code_mode.py
eval_project_tracker_mcp.py
eval_stdio_mcp_server.py
README.md
mcp_servers/
authorization/
.dockerignore
.env.example
docker/
docker-compose.yml
Dockerfile
README.md
pyproject.toml
README.md
src/
authorization/
__init__.py
server.py
custom_server_with_prebuilt_tools/
pyproject.toml
server.py
echo/
pyproject.toml
src/
echo/
__init__.py
server.py
enum_elicitation/
pyproject.toml
README.md
src/
enum_elicitation/
__init__.py
server.py
local_filesystem/
pyproject.toml
src/
local_filesystem/
__init__.py
server.py
tools.py
utils.py
logging/
.dockerignore
docker/
docker-compose.yml
Dockerfile
README.md
pyproject.toml
src/
logging/
__init__.py
server.py
pctx_code_mode/
docker/
docker-compose.yml
Dockerfile
pyproject.toml
src/
pctx_code_mode/
__init__.py
server.py
store.py
progress_reporting/
pyproject.toml
src/
progress_reporting/
__init__.py
server.py
README.md
resources/
pyproject.toml
src/
resources/
__init__.py
app.html
data.py
logo.png
schemas.py
server.py
sampling/
sampling_with_tools/
pyproject.toml
README.md
src/
sampling_with_tools/
__init__.py
server.py
pyproject.toml
src/
sampling/
__init__.py
server.py
server_branding/
pyproject.toml
README.md
src/
server_branding/
__init__.py
server.py
server_with_evaluations/
evals/
eval_using_binary_critic.py
eval_using_datetime_critic.py
eval_using_numeric_critic.py
eval_using_similarity_critic.py
pyproject.toml
src/
server_with_evaluations/
__init__.py
server.py
tools/
__init__.py
tools_for_binary_critic.py
tools_for_datetime_critic.py
tools_for_numeric_critic.py
tools_for_similarity_critic.py
servicenow/
.env.example
evals/
eval_servicenow_incidents.py
pyproject.toml
src/
servicenow/
__init__.py
server.py
tools/
__init__.py
tools_incidents.py
simple/
.env.example
pyproject.toml
src/
simple/
__init__.py
server.py
task_augmentation/
pyproject.toml
README.md
src/
task_augmentation/
__init__.py
server.py
telemetry_passback/
.env.example
docker-compose.yml
pyproject.toml
README.md
src/
telemetry_passback/
__init__.py
agent.py
server.py
tool_chaining/
.env.example
pyproject.toml
src/
tool_chaining/
__init__.py
server.py
tool_metadata/
pyproject.toml
README.md
src/
tool_metadata/
__init__.py
.env.example
server.py
tools_with_output_schema/
pyproject.toml
src/
tools_with_output_schema/
__init__.py
server.py
typed_errors/
pyproject.toml
README.md
src/
typed_errors/
__init__.py
server.py
url_elicitation/
pyproject.toml
README.md
src/
url_elicitation/
__init__.py
server.py
user_elicitation/
pyproject.toml
src/
user_elicitation/
__init__.py
server.py
libs/
arcade-cli/
arcade_cli/
__init__.py
authn.py
config.py
configure.py
connect.py
console.py
constants.py
deploy.py
display.py
evals_runner.py
formatters/
__init__.py
base.py
html.py
json.py
markdown.py
text.py
main.py
new.py
org.py
project.py
secret.py
server.py
show.py
templates/
__init__.py
base.jinja
cli_login_failed.jinja
cli_login_success.jinja
full/
{{ toolkit_name }}/
.pre-commit-config.yaml
.ruff.toml
{{ package_name }}/
__init__.py
__main__.py
tools/
__init__.py
sample.py
conftest.py
evals/
eval_{{ toolkit_name }}.py
LICENSE
Makefile
pyproject.toml
tests/
__init__.py
test_{{ toolkit_name }}.py
minimal/
{{ toolkit_name }}/
.env.example
pyproject.toml
src/
{{ toolkit_name }}/
__init__.py
server.py
update.py
usage/
command_tracker.py
constants.py
utils.py
README.md
run_cli.py
arcade-core/
arcade_core/
__init__.py
annotations.py
auth_tokens.py
auth.py
catalog.py
config_model.py
config.py
constants.py
context.py
converters/
__init__.py
anthropic.py
openai.py
utils.py
discovery.py
errors.py
executor.py
log_extras.py
metadata.py
network/
__init__.py
org_transport.py
output.py
parse.py
py.typed
schema.py
subprocess_utils.py
toolkit.py
usage/
__init__.py
__main__.py
constants.py
identity.py
usage_service.py
utils.py
utils.py
version.py
pyproject.toml
README.md
arcade-evals/
arcade_evals/
__init__.py
_evalsuite/
__init__.py
_anthropic_schema.py
_capture.py
_comparative_execution.py
_comparative.py
_convenience.py
_openai_schema.py
_providers.py
_tool_registry.py
_tracks.py
_types.py
capture.py
critic.py
errors.py
eval.py
loaders.py
py.typed
weights.py
README.md
arcade-mcp-server/
arcade_mcp_server/
__init__.py
__main__.py
_debug_exposure.py
_validation.py
auth/
__init__.py
context.py
convert.py
decorators.py
exceptions.py
fastapi/
__init__.py
auth_routes.py
middleware.py
routes.py
lifespan.py
logging_utils.py
managers/
__init__.py
base.py
prompt.py
... 295 moreFAQ
arcade-mcp is a Claude Code plugin with 1 hand-picked skill for development work, indexed on Flowy. Install it with the command on its page. It includes build-error-adapter. Its skills do not fire on their own yet. Request auto-invocation to have Flowy route them as you prompt. Free and open source.
- What is arcade-mcp?
- Open-source Python framework for building MCP servers and tools.
- How do I install arcade-mcp?
- Run these in Claude Code: npx -y skills add ArcadeAI/arcade-mcp --agent claude-code. Then prompt normally.
- Does arcade-mcp auto-invoke its skills?
- Not yet. It is indexed on Flowy as a plain plugin. Request auto-invocation on its page and Flowy will route its skills for you as you prompt.
- Is arcade-mcp free?
- Yes. Flowy is free and open source, with nothing gated. You can read every skill in full before you install.