MCP, MCP server
Dedalus Mcp Python
Minimal, spec-faithful Python framework for building Model Context Protocol (MCP) clients and servers.
Compatibility: Not stated.
Grade B
Minor issues only, no Medium or High. Worth a quick look at the findings below before installing.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
Rescanned at commit 89d556055301, unchanged since the check below.
NETWORK_NO_FIXED_HOST SECRETS_PATH_DOTENV INSTALL_DOCUMENTED_INSTALLER SECRETS_ENV_READ OBFUSCATION_FILE_OVER_READ_CAP OBFUSCATION_FILE_CAP_REACHED
Why this grade
- NETWORK_NO_FIXED_HOST Low
Makes a network call whose host is not written as a fixed address.
example_metadata_endpoint.py, line 8
curl http://127.0.0.1:8000/.well-known/mcp-server.json | jq - SECRETS_PATH_DOTENV Low
Mentions a .env file.
examples/auth/02_as/server.py, line 84
raise RuntimeError("SUPABASE_URL must be set (try .env for local dev)") - INSTALL_DOCUMENTED_INSTALLER Note
Documentation shows an installer that pipes a download into a shell.
docs/mcp/getting-started/build-an-mcp-server/index.md, line 82
curl -LsSf https://astral.sh/uv/install.sh | sh - SECRETS_ENV_READ Note
Reads an environment variable whose name contains KEY, SECRET, TOKEN, PASSWORD or CREDENTIAL.
examples/north_star.py, line 89
token = os.environ.get("GITHUB_TOKEN") - OBFUSCATION_FILE_OVER_READ_CAP Note
A file was over the read cap and was not fully read.
uv.lock, line 1
version = 1 - OBFUSCATION_FILE_CAP_REACHED Note
The 400 file cap was reached before every file was read.
uv.lock, line 1
version = 1
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Pass
No shell or command execution found, and no extra permission was declared.
Install and update
Note
The docs document an installer that pipes a download into a shell.
INSTALL_DOCUMENTED_INSTALLER
docs/mcp/getting-started/build-an-mcp-server/index.md, line 82
curl -LsSf https://astral.sh/uv/install.sh | sh
Network
Concern
can reach a host that is not written as a fixed address.
NETWORK_NO_FIXED_HOST
example_metadata_endpoint.py, line 8
curl http://127.0.0.1:8000/.well-known/mcp-server.json | jq
example_metadata_endpoint.py, line 39
print(" curl http://127.0.0.1:8000/.well-known/mcp-server.json | jq")
examples/advanced/authorization.py, line 142
print('Test: curl -H "Authorization: Bearer valid-demo-token" http://localhost:8000/mcp')
Show more
examples/showcase/03_realtime_client.py, line 17
curl -X POST http://127.0.0.1:8001/tools \
README.md, line 114
async def fetch(url: str) -> dict:
docs/mcp/getting-started/build-an-mcp-server/index.md, line 506
const response = await fetch(url, { headers });
docs/style/best-practices.md, line 156
data = requests.get(url) # Blocks!
docs/style/best-practices.md, line 173
result = await fetch(url)
docs/style/best-practices.md, line 179
tasks = [fetch(url) for url in urls]
docs/style/guide.md, line 226
def fetch(url: str, timeout: float | None = None) -> Response:
docs/style/guide.md, line 252
uri: The resource URI to fetch (e.g., "file:///path/to/file").
Secrets
Concern
reads a credential or environment file.
SECRETS_ENV_READ SECRETS_PATH_DOTENV
examples/north_star.py, line 89
token = os.environ.get("GITHUB_TOKEN")
examples/north_star_combined.py, line 192
supabase_key = os.environ.get("SUPABASE_KEY") or os.environ.get("SUPABASE_ANON_KEY")
examples/auth/02_as/server.py, line 84
raise RuntimeError("SUPABASE_URL must be set (try .env for local dev)")
Show more
examples/north_star_combined.py, line 193
openai_key = os.environ.get("OPENAI_API_KEY")
examples/north_star_combined.py, line 194
dedalus_key = os.environ.get("DEDALUS_API_KEY")
examples/north_star_openai.py, line 200
api_key = os.environ.get("OPENAI_API_KEY")
examples/north_star_supabase.py, line 137
key = os.environ.get("SUPABASE_KEY") or os.environ.get("SUPABASE_ANON_KEY")
examples/auth/01_simple/server.py, line 30
SUPABASE_SECRET_KEY = os.getenv("SUPABASE_SECRET_KEY")
examples/auth/02_as/server.py, line 82
key = os.getenv("SUPABASE_SECRET_KEY")
.gitignore, line 26
# Environments
.gitignore, line 27
.env
docs/mcp/getting-started/build-an-mcp-client/index.md, line 74
Create a `.env` file to store it:
docs/mcp/getting-started/build-an-mcp-client/index.md, line 77
echo "ANTHROPIC_API_KEY=<your key here>" > .env
docs/mcp/getting-started/build-an-mcp-client/index.md, line 80
Add `.env` to your `.gitignore`:
docs/mcp/getting-started/build-an-mcp-client/index.md, line 83
echo ".env" >> .gitignore
docs/mcp/getting-started/build-an-mcp-client/index.md, line 107
load_dotenv() # load environment variables from .env
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Note
a file was over the read cap and was not fully read. the file cap was reached before every file was read.
OBFUSCATION_FILE_OVER_READ_CAP OBFUSCATION_FILE_CAP_REACHED
uv.lock, line 1
version = 1
src/dedalus_mcp/progress.py, line 1
# Copyright (c) 2026 Dedalus Labs, Inc. and its contributors
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit 89d556055301. The docs document an installer that pipes a download into a shell. can reach a host that is not written as a fixed address. reads a credential or environment file. a file was over the read cap and was not fully read. the file cap was reached before every file was read.
Date and source
Date checked:
github.com
Commit graded: 89d556055301a62e488e2e86c2f14d142da9e505
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