Skills/PyPI/prefect-mcp

prefect-mcp@0.0.1b13

CAUTION· not started

Publisher claims: "MCP server for interacting with Prefect" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry PyPI (MCP server)Publisher prefect-technologies-help · publishing for 404 daysInstalls 7,159Last detonated 3 h ago
What would fix thisWatchDispute verdict

Coverage

Not started: dependency install failed; the server itself was not observed.
Tested
the dependency install step · every file read, file written and host contacted by what ran
Not tested
server startup · the tool list · tool behavior

What this means for the label: Caution here covers what ran. The server's tools were not exercised with a real credential, so nothing about their behavior is asserted; the credential summary below says what to do with that.

Before you give it your token

It will ask for
OPENAI_API_KEYTURBOPUFFER_API_KEY or --client-secretConfiguration, not credentials: ENVIRONMENT, EVALUATOR_MODEL, MODEL_PROVIDER, PREFECT_MCP_PUBLIC_BASE_URL, REASONING_AGENT_MODEL, SIMPLE_AGENT_MODEL, TURBOPUFFER_REGION
Where it talks to
prefect.cloud, prefect.io, prefect.dev (its own)Also sitemaps.org, fastmcp.app — not the publisher's domain; check what for before connecting.
What the honeypot saw
no credential files read · no network
What we could not test
server startup · the tool list · tool behavior

Connect it with a scoped credential, under the guard, and read the third-party hosts first. The code names sitemaps.org, fastmcp.app as well as its own vendor. The guard injects OPENAI_API_KEY, TURBOPUFFER_API_KEY only into requests to prefect.cloud (and its subdomains) and refuses the rest.

$vet-skills run --secrets OPENAI_API_KEY=prefect.cloud,TURBOPUFFER_API_KEY=prefect.cloud -- uvx prefect-mcp

Never paste a credential into a chat, a ticket or a report, including ours. How the guard holds it.

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios; not started: dependency install failed; the server itself was not observed) on 2026-11-15 and scored it 76/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: Collapsed <details> block carrying instructions; Access to sensitive file paths; Access to sensitive file paths. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 0 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.1sprocessdependency install exit 1 ·
0.1sclaimednot started: dependency install failed (exit 1); the server itself was not observed
0.2sprocessscript backend runs setup only
0.2sprocessno install scripts to re-run

Static findings

HIGH
Collapsed <details> block carrying instructionsREADME.md:439 · Collapsed <details> block carrying instructions<summary>Setup and testing</summary> ```bash # clone the repo gh repo clone prefecthq/prefect-mcp-server && cd prefect-mcp-server # install dev deps and pre-comFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
HIGH
Access to sensitive file pathssrc/prefect_mcp_server/cloud_oauth.py:41 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesenv_file=".env",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Privileged sudo command.github/workflows/publish.yml:56 · Privileged sudo command — agent may execute with elevated privilegessudo mv mcp-publisher /usr/local/bin/Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
Access to sensitive file pathsevals/conftest.py:38 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesload_dotenv(".env.local")Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
MCP server using network transport (SSE/HTTP)tests/test_header_auth.py:176 · MCP server using network transport (SSE/HTTP) — data sent over network"prefect_mcp_server._prefect_client.client.httpx.BasicAuth"Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
MCP server using network transport (SSE/HTTP)tests/test_header_auth.py:24 · MCP server using network transport (SSE/HTTP) — data sent over network"prefect_mcp_server.middleware.get_http_headers"Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
HIGH
Access to sensitive file pathssrc/prefect_mcp_server/settings.py:32 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesenv_prefix="LOGFIRE_", extra="ignore", env_file=".env"Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
MCP server using network transport (SSE/HTTP)evals/rate_limits/conftest.py:20 · MCP server using network transport (SSE/HTTP) — data sent over networkfrom pydantic_ai.mcp import MCPServer, MCPServerStdio, MCPServerStreamableHTTPFix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.
AST04
MEDIUM
MCP server using network transport (SSE/HTTP)tests/test_header_auth.py:61 · MCP server using network transport (SSE/HTTP) — data sent over network"prefect_mcp_server.middleware.get_http_headers"Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
HIGH
Collapsed <details> block carrying instructionsREADME.md:192 · Collapsed <details> block carrying instructions<summary>Cloud OAuth configuration reference</summary> Cloud OAuth settings use the `PREFECT_MCP_CLOUD_` prefix: | Environment variable | Purpose | | --- | --- Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
HIGH
Access to sensitive file pathssrc/prefect_mcp_server/settings.py:69 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesmodel_config = SettingsConfigDict(env_file=[".env"], extra="ignore")Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
MCP server using network transport (SSE/HTTP)tests/test_header_auth.py:111 · MCP server using network transport (SSE/HTTP) — data sent over network"prefect_mcp_server.middleware.get_http_headers"Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
HIGH
Access to sensitive file pathssrc/prefect_mcp_server/settings.py:57 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesenv_file=".env",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
MCP server using network transport (SSE/HTTP)tests/test_header_auth.py:88 · MCP server using network transport (SSE/HTTP) — data sent over network"prefect_mcp_server.middleware.get_http_headers"Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
MCP server using network transport (SSE/HTTP)evals/rate_limits/conftest.py:472 · MCP server using network transport (SSE/HTTP) — data sent over networkreturn MCPServerStreamableHTTP(Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.
AST04
HIGH
Access to sensitive file pathssrc/prefect_mcp_server/settings.py:14 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesenv_prefix="PREFECT_DOCS_MCP_", extra="ignore", env_file=".env"Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Python subprocess execution detectedevals/rate_limits/conftest.py:411 · Python subprocess execution detectedprocess = subprocess.Popen(Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.
AST05

Cost to the agent

Instructions loaded
≈388 tok
2 files · 81 in bundle
Tool list per prompt
≈0 tok
0 tools · 0 per tool
Handshake
no reply
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 0

Tokens estimated at four characters each. The tool list is re-read by the agent on every turn, so it is the number to compare between servers that do the same job: ranked across the index.

Known vulnerabilities

No advisories in OSV for prefect-mcp@0.0.1b13 as of 2 h ago. This is the package itself, not its dependencies.

What would make this Verified

4 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. Unclaimed publisher≈ +8 on the totalClaim prefect-technologies-help: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  2. Hidden instructions≈ +6 on the totalRemove HTML comments, zero-width characters and white-on-white text that carry instructions. Everything the agent is meant to read should be visible to the person reading the file.
  3. Access to sensitive file paths≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  4. Privileged sudo command≈ +2 on the totalBuild commands from fixed arguments; do not interpolate untrusted strings into a shell.
  5. MCP server using network transport (SSE/HTTP)≈ +2 on the totalNamespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
  6. Python subprocess execution detected≈ +2 on the totalPut hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.
Publish a new version to PyPI, then queue it here. Not your skill? Claim the handle to get verdict changes by email.Claim prefect-technologies-helpPropose a patch to the maintainer