Install this version:
emerge -a =dev-python/fastmcp-4.0.2
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =dev-python/fastmcp-4.0.2
Or alternatively:
emerge --autounmask-write -a =dev-python/fastmcp-4.0.2
# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
DISTUTILS_USE_PEP517=hatchling
PYTHON_COMPAT=( python3_{12..14} )
inherit distutils-r1 pypi
DESCRIPTION="Fast framework for building Model Context Protocol servers"
HOMEPAGE="
https://github.com/PrefectHQ/fastmcp
https://pypi.org/project/fastmcp/
"
# Build the bundled implementation instead of the empty root metapackage.
S="${WORKDIR}/${P}/fastmcp_slim"
LICENSE="Apache-2.0"
SLOT="0"
KEYWORDS="~amd64 ~arm64"
# Ship the union of fastmcp-slim's base, mcp, client, and server groups; provider
# extras are outside the root metapackage and depend on unpackaged integrations.
# Audit bundled fastmcp_slim/pyproject.toml, not root Requires-Dist, which only
# pins slim extras. These groups are unchanged since 4.0.0. # verified 2026-09-04
RDEPEND="
>=dev-python/mcp-types-2.0.0[${PYTHON_USEDEP}]
<dev-python/mcp-types-3[${PYTHON_USEDEP}]
>=dev-python/platformdirs-4.0.0[${PYTHON_USEDEP}]
>=dev-python/pydantic-2.12.0[${PYTHON_USEDEP}]
dev-python/email-validator[${PYTHON_USEDEP}]
>=dev-python/pydantic-settings-2.0.0[${PYTHON_USEDEP}]
>=dev-python/python-dotenv-1.1.0[${PYTHON_USEDEP}]
>=dev-python/rich-13.9.4[${PYTHON_USEDEP}]
>=dev-python/typing-extensions-4.0.0[${PYTHON_USEDEP}]
>=dev-python/exceptiongroup-1.2.2[${PYTHON_USEDEP}]
>=dev-python/httpx2-2.5.0[${PYTHON_USEDEP}]
>=dev-python/mcp-2.0.0[${PYTHON_USEDEP}]
<dev-python/mcp-3[${PYTHON_USEDEP}]
>=dev-python/opentelemetry-api-1.28.0[${PYTHON_USEDEP}]
>=dev-python/starlette-1.0.1[${PYTHON_USEDEP}]
>=dev-python/authlib-1.6.11[${PYTHON_USEDEP}]
>=dev-python/py-key-value-aio-0.4.4[${PYTHON_USEDEP}]
<dev-python/py-key-value-aio-0.5[${PYTHON_USEDEP}]
>=dev-python/cyclopts-4.0.0[${PYTHON_USEDEP}]
>=dev-python/griffelib-2.0.0[${PYTHON_USEDEP}]
>=dev-python/jsonref-1.1.0[${PYTHON_USEDEP}]
>=dev-python/jsonschema-path-0.3.4[${PYTHON_USEDEP}]
>=dev-python/joserfc-1.5.0[${PYTHON_USEDEP}]
>=dev-python/openapi-pydantic-0.5.1[${PYTHON_USEDEP}]
>=dev-python/packaging-24.0[${PYTHON_USEDEP}]
>=dev-python/pyperclip-1.9.0[${PYTHON_USEDEP}]
>=dev-python/python-multipart-0.0.26[${PYTHON_USEDEP}]
>=dev-python/pyyaml-6.0[${PYTHON_USEDEP}]
<dev-python/pyyaml-7.0[${PYTHON_USEDEP}]
>=dev-python/uncalled-for-0.4.0[${PYTHON_USEDEP}]
>=dev-python/uvicorn-0.35[${PYTHON_USEDEP}]
>=dev-python/watchfiles-1.0.0[${PYTHON_USEDEP}]
>=dev-python/websockets-15.0.1[${PYTHON_USEDEP}]
"
BDEPEND="
dev-python/hatchling[${PYTHON_USEDEP}]
>=dev-python/uv-dynamic-versioning-0.7.0[${PYTHON_USEDEP}]
"
# The plain py-key-value-aio atom already supplies the requested filetree,
# keyring, and memory extras. # verified 2026-09-01
# The upstream suite requires its full development workspace and live service
# integrations, including Node-based MCP conformance tests.
RESTRICT="test"
export UV_DYNAMIC_VERSIONING_BYPASS=${PV}
>=dev-python/mcp-types-2.0.0[] <dev-python/mcp-types-3[] >=dev-python/platformdirs-4.0.0[] >=dev-python/pydantic-2.12.0[] dev-python/email-validator[] >=dev-python/pydantic-settings-2.0.0[] >=dev-python/python-dotenv-1.1.0[] >=dev-python/rich-13.9.4[] >=dev-python/typing-extensions-4.0.0[] >=dev-python/exceptiongroup-1.2.2[] >=dev-python/httpx2-2.5.0[] >=dev-python/mcp-2.0.0[] <dev-python/mcp-3[] >=dev-python/opentelemetry-api-1.28.0[] >=dev-python/starlette-1.0.1[] >=dev-python/authlib-1.6.11[] >=dev-python/py-key-value-aio-0.4.4[] <dev-python/py-key-value-aio-0.5[] >=dev-python/cyclopts-4.0.0[] >=dev-python/griffelib-2.0.0[] >=dev-python/jsonref-1.1.0[] >=dev-python/jsonschema-path-0.3.4[] >=dev-python/joserfc-1.5.0[] >=dev-python/openapi-pydantic-0.5.1[] >=dev-python/packaging-24.0[] >=dev-python/pyperclip-1.9.0[] >=dev-python/python-multipart-0.0.26[] >=dev-python/pyyaml-6.0[] <dev-python/pyyaml-7.0[] >=dev-python/uncalled-for-0.4.0[] >=dev-python/uvicorn-0.35[] >=dev-python/watchfiles-1.0.0[] >=dev-python/websockets-15.0.1[]
dev-python/hatchling[] >=dev-python/uv-dynamic-versioning-0.7.0[]