hedron-mcp

Deny-by-default MCP Streamable HTTP projection for Hedron.

Disabled and empty until resources and tools are explicitly registered. MCP never grants authority beyond the authenticated principal. Installing the package without registrations remains a no-op empty server.

Also available as the flagship extra hedron[mcp].

Package maturity: Beta (0.2.x) · pin >=0.2.0,<0.3

Production-grade for the declared Supported inventory (phase 0.32 / RFC-0065). Mutating tools remain Experimental (allow_mutations=True).

Install

pip install "hedron-mcp>=0.2.5,<0.3"
# or
uv add "hedron-mcp>=0.2.5,<0.3"
# via flagship extra:
pip install "hedron[mcp]>=1.0.0"

Requires Python 3.10–3.14.

Quick start

from hedron import Hedron
from hedron_mcp import McpProjection, McpResource, McpTool, mount_mcp

app = Hedron(
    title="MCP demo",
    security="standard",
    session_secret="dev-only",
)

# Prefer session / host auth after SessionMiddleware is installed.
# Do not read request.session without that middleware.
projection = McpProjection(
    enabled=True,
    principal_resolver=lambda request: getattr(request, "user", None),
)
projection.register_resource(McpResource(uri="hedron://page/home", name="home"))
projection.register_tool(
    McpTool(
        name="status",
        schema={"type": "object", "properties": {}},
        mutate=False,
        handler=lambda: {"ok": True},
    )
)
mount_mcp(app, projection)

License

MIT

Release files for hedron-mcp 0.2.6

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for hedron-mcp 0.2.6
File	Size	Uploaded
hedron_mcp-0.2.6.tar.gz	18.3 kB	Sep 25, 2026	Details

Built distribution (wheel)

Table of built distributions (wheels) for hedron-mcp 0.2.6
File	Interpreter	ABI	Platform	Reset
hedron_mcp-0.2.6-py3-none-any.whl 20.8 kB Sep 25, 2026	Python 3	none	any	Details

Total release size: 39.1 kB

Release files / hedron_mcp-0.2.6.tar.gz

Download URL	hedron_mcp-0.2.6.tar.gz
Size	18.3 kB
Tags	Source
SHA-256 checksum How to use checksums	`ec9b334b3fe7e19b2866bf7fcad7d2a17f83f2f10f12fa08293b2f547fc71d6a`
BLAKE2b-256 checksum How to use checksums	`d72afc3e6c98703e0cd47ba04df9fc139efbb6656349c82a6f2c0fdf6a1e5348`
Upload date	Sep 25, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`uv/0.12.1 {"installer":{"name":"uv","version":"0.12.1","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}`

Release files / hedron_mcp-0.2.6-py3-none-any.whl

Download URL	hedron_mcp-0.2.6-py3-none-any.whl
Size	20.8 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`02acd4852d43e5f0aa12550cefc07a061ddb5726e33cbc0cc0baefa8e0c2a7fb`
BLAKE2b-256 checksum How to use checksums	`c092aa101a1a1ee2290709582447508bedbaafa70a28f8e2dab0c6d4795ede7f`
Upload date	Sep 25, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`uv/0.12.1 {"installer":{"name":"uv","version":"0.12.1","subcommand":["publish"]},"python":null,"implementation":{"name":null,"version":null},"distro":{"name":"Ubuntu","version":"24.04","id":"noble","libc":null},"system":{"name":null,"release":null},"cpu":null,"openssl_version":null,"setuptools_version":null,"rustc_version":null,"ci":true}`