Skills/PyPI/platformio.mcp

platformio.mcp@0.7.0

CAUTION· not started

Publisher claims: "MCP server that lets AI coding agents drive PlatformIO: boards, projects, build, flash, serial monitor, tests, static analysis, libraries." Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry PyPI (MCP server)Publisher powerdragonfire · publishing for 59 daysInstalls 1,312Last detonated 27 min 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
POSTHOG_PROJECT_TOKENConfiguration, not credentials: PLATFORMIO_CORE_DIR, PLATFORMIO_MCP_ANALYTICS, PLATFORMIO_MCP_ANALYTICS_DIR, PLATFORMIO_MCP_ANALYTICS_URL, PLATFORMIO_MCP_CAPTURE_PROMPTS, PLATFORMIO_MCP_LOG_DIR, PLATFORMIO_MCP_MAX_LOGS, PLATFORMIO_MCP_MODEL, PLATFORMIO_MCP_PIO, PLATFORMIO_MCP_POLICY, PLATFORMIO_MCP_POSTHOG_HOST, PLATFORMIO_MCP_POSTHOG_KEY, PLATFORMIO_MCP_PROJECT_DIR, PLATFORMIO_MCP_REASONING_EFFORT, PLATFORMIO_PACKAGES_DIR, POSTHOG_HOST
Where it talks to
no vendor host named in the codeAlso posthog.com, bit.ly — 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 posthog.com, bit.ly as well as its own vendor. The guard injects POSTHOG_PROJECT_TOKEN only into requests to the host you bind (and its subdomains) and refuses the rest.

$vet-skills run --net declared -- uvx platformio.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 2026-11-14 and scored it 66/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: Privileged sudo command; Collapsed <details> block carrying instructions. 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
0.1sprocessscript backend runs setup only
0.2sprocessno install scripts to re-run

Static findings

MEDIUM
Python subprocess execution detectedsrc/platformio_mcp/toolchain.py:125 · Python subprocess execution detectedproc = subprocess.run(cmd, capture_output=True, text=True, errors="replace", timeout=timeout)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedsrc/platformio_mcp/pio.py:171 · Python subprocess execution detectedproc = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
File type combined with upload actionsrc/platformio_mcp/partitions.py:164 · File type combined with upload action — agent may exfiltrate local data files…576:.0f} MB (0x{flash_size:x}).", "Pick a CSV sized for this flash (e.g. default.csv for 4 MB, default_16MB.csv for 16 MB) or set board_upload.flash_size to the real chip size.") elif flash_size - table_end >= 1024…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
Python subprocess execution detectedsrc/platformio_mcp/cli.py:65 · Python subprocess execution detectedsubprocess.run(cmd, check=False)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
HIGH
Privileged sudo commandsrc/platformio_mcp/tools/devices.py:105 · Privileged sudo command — agent may execute with elevated privilegesreturn f"no read/write permission on {port}. Add yourself to the serial group (`sudo usermod -aG dialout $USER`, or `uucp` on Arch) and log in again, or `sudo chmod a+rw {port}` for this session."Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
Collapsed <details> block carrying instructionsREADME.md:79 · Collapsed <details> block carrying instructions<summary><b>Already have PlatformIO?</b></summary> The server finds `platformio` / `pio` on your PATH or in `~/.platformio/penv`. Override with `PLATFORMIO_MCP_Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
MEDIUM
Python subprocess execution detectedsrc/platformio_mcp/tools/devices.py:73 · Python subprocess execution detectedres = subprocess.run(cmd, capture_output=True, text=True, timeout=10)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedsrc/platformio_mcp/debugger.py:303 · Python subprocess execution detectedreturn subprocess.Popen(cmd, cwd=cwd, env=env, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True, encoding="utf-8", errors="replace", bufsize=1, **kwargs)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedsrc/platformio_mcp/tools/devices.py:85 · Python subprocess execution detectedps = subprocess.run(["ps", "-o", "comm=", "-p", str(pid)], capture_output=True, text=True, timeout=10)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
URL shortener detectedsrc/platformio_mcp/pio.py:17 · URL shortener detected — destination cannot be verified"LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf",Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
MEDIUM
Python subprocess execution detectedsrc/platformio_mcp/tools/hardware.py:179 · Python subprocess execution detectedres = subprocess.run(["git", "-C", project_dir, *args], capture_output=True, text=True, timeout=5)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
File permission modification commandsrc/platformio_mcp/tools/devices.py:105 · File permission modification command — agent changes file ownership/permissionsreturn f"no read/write permission on {port}. Add yourself to the serial group (`sudo usermod -aG dialout $USER`, or `uucp` on Arch) and log in again, or `sudo chmod a+rw {port}` for this session."Fix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05
MEDIUM
Python subprocess execution detectedsrc/platformio_mcp/tools/ota.py:89 · Python subprocess execution detectedreturn subprocess.run(cmd, capture_output=True, timeout=timeout_s + 3).returncode == 0Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedsrc/platformio_mcp/tools/flash.py:219 · Python subprocess execution detectedproc = subprocess.run(cmd, capture_output=True, text=True, errors="replace", timeout=timeout)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Python subprocess execution detectedsrc/platformio_mcp/tools/ota.py:109 · Python subprocess execution detectedproc = subprocess.run(cmd, capture_output=True, text=True, errors="replace", timeout=timeout)Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05

Cost to the agent

Instructions loaded
≈72 tok
1 file · 31 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 platformio.mcp@0.7.0 as of 6 min ago. This is the package itself, not its dependencies.

What would make this Verified

14 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. Text that tells the agent to ignore its instructions≈ +9 on the totalDelete phrases like "ignore previous instructions", "override", "bypass" from SKILL.md and tool descriptions. Describe what the skill does; do not instruct the agent about other rules.
  2. Unclaimed publisher≈ +8 on the totalClaim powerdragonfire: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  3. 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.
  4. Privileged sudo command≈ +4 on the totalBuild commands from fixed arguments; do not interpolate untrusted strings into a shell.
  5. Python subprocess execution detected≈ +2 on the totalBuild commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
  6. File type combined with upload action≈ +2 on the totalRemove the call, or declare the host in frontmatter and explain in the README what is sent and why.
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