# USB Servo Controller (pypi · ucan-servo-mcp) Drive 12 hobby servos on an open-hardware USB-C controller: moves, poses, sequences, rail current - Trust score: 51/100 (low) - Change this week: −15 - Registry status: active - Liveness: live - Owner verified: no - Last scored: 2026-11-05 ## Components - pypi · `ucan-servo-mcp`: 51/100 (this document), [markdown](https://verifymcp.io/servers/lukasz-juranek-usb-servo-controller/ucan-servo-mcp.md), [page](https://verifymcp.io/servers/lukasz-juranek-usb-servo-controller/ucan-servo-mcp) ## Channel facts - Registry: `pypi` - Package: `ucan-servo-mcp` - Version: `0.4.1` - Transport: `stdio` ## Trust breakdown How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog) Scored 2026-11-05. - **Supply Chain Security**: 49/100 - Malware scan not yet available for this package. - No known CVEs affecting this package version or its production dependencies. - Runs setuptools.build_meta at install time, a recognised build step with no custom scripting around it. - 2 of 29 dependencies flagged as unhealthy. - **Provenance & Transparency**: 45/100 - Source repository is publicly reachable at the declared URL. - Provenance check failed: no build-provenance attestation is published. - Clear OSI-approved license (MIT). - Actively maintained (last published 12 days ago). - Disclosure check failed: no security disclosure policy was found in the source repository. - **Schema Quality & AI Usability**: 65/100 - AI-judged instruction clarity (good). - Tool/resource definitions use about 954 tokens (~59/item across 16 items; 16 tools + 0 resources), lean. - Usage-examples check failed: none of the tools include examples. - **Stability & Change Management**: 0/100 - Stability not yet verified: not enough scan history yet (needs a 30-day window). - **Tool Coverage**: 71/100 - 100% of tools have a non-trivial description (not blank, and not just the tool's name). - 0% of tool parameters carry a description. - Structured output schemas are declared (38% of tools); any adoption earns full credit. - **Tool Safety**: 100/100 - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured. - We read all 16 captured tool definition(s), and no name or description among them implies an irreversible operation. - An AI judge read all 17 captured unit(s) of tool text and found none that tries to manipulate the model reading it. - **Capabilities**: 100/100 - Implements a current MCP spec version (2026-07-28). **Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm. ## Install ### How do I install the USB Servo Controller MCP server? USB Servo Controller runs locally as a PyPI package, launched with uvx ucan-servo-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation. ### Claude ```bash claude mcp add lukasz-juranek-usb-servo-controller -- uvx ucan-servo-mcp ``` ### Cursor ```json { "mcpServers": { "lukasz-juranek-usb-servo-controller": { "command": "uvx", "args": [ "ucan-servo-mcp" ] } } } ``` ### VS Code ```json { "servers": { "lukasz-juranek-usb-servo-controller": { "command": "uvx", "args": [ "ucan-servo-mcp" ] } } } ``` ### Codex ```bash codex mcp add lukasz-juranek-usb-servo-controller -- uvx ucan-servo-mcp ``` ### opencode ```json { "$schema": "https://opencode.ai/config.json", "mcp": { "lukasz-juranek-usb-servo-controller": { "type": "local", "command": [ "uvx", "ucan-servo-mcp" ], "enabled": true } } } ``` ### OpenClaw ```bash openclaw mcp add lukasz-juranek-usb-servo-controller --command uvx --arg ucan-servo-mcp ``` ### Hermes ```yaml mcp_servers: lukasz-juranek-usb-servo-controller: command: "uvx" args: ["ucan-servo-mcp"] ``` ### Netclaw ```json { "McpServers": { "lukasz-juranek-usb-servo-controller": { "Transport": "stdio", "Command": "uvx", "Arguments": [ "ucan-servo-mcp" ] } } } ``` ### Vellum ```bash assistant mcp add lukasz-juranek-usb-servo-controller -t stdio -c uvx -a ucan-servo-mcp ``` ### Other ```json { "mcpServers": { "lukasz-juranek-usb-servo-controller": { "command": "uvx", "args": [ "ucan-servo-mcp" ] } } } ``` ## Changelog Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims. ### 2026-11-05 (score 51, −15) - [security regression] Malware scan: pass → unverified ### 2026-11-03 (score 66, +15) - [security improvement] Malware scan: unverified → pass ### 2026-11-02 (score 51, −15) - [security regression] Malware scan: pass → unverified ### 2026-11-01 (score 66, +15) - [security improvement] Malware scan: unverified → pass ### 2026-10-31 (score 51, −15) - [security regression] Malware scan: pass → unverified ### 2026-10-29 (score 66, +15) - [security improvement] Malware scan: unverified → pass ### 2026-10-26 (score 51, −15) - [security regression] Malware scan: pass → unverified ### 2026-10-25 (score 66, +15) - [security improvement] Malware scan: unverified → pass ## MCP tools (16) ### `board_status` (~39 tokens) Rail current/voltage, faults, protection limits, and every channel's name, mode, travel limits, speed and current position (0 = off). ### `move_servos` (~93 tokens) Move one or more servos and wait until they arrive. positions: {channel number or name: pulse width in us}, e.g. {"0": 1200}. duration_s: time for all to arrive together (0 = each channel's own speed). Positions are clamped to each channel's limits. Turns channels on if off. Input parameters: - `duration_s` (number) - `positions` (object, required) ### `disable_servos` (~32 tokens) Stop driving the given channels (numbers or names); the servos go limp. Input parameters: - `channels` (array, required) Output parameters: - `result` (string) ### `stop_all` (~16 tokens) Panic stop: every channel off immediately. Output parameters: - `result` (string) ### `list_poses` (~24 tokens) Poses and the sequence saved from the GUI (servogui.json). ### `go_to_pose` (~41 tokens) Move to a saved pose (see list_poses) and wait until it arrives. Input parameters: - `duration_s` (number) - `name` (string, required) ### `play_sequence` (~50 tokens) Play the GUI's saved sequence of poses (move and hold times as saved), repeated `loops` times. Stops early on a fault; capped at 120 s. Input parameters: - `loops` (integer) ### `read_analog` (~41 tokens) Read channel 0-7 as an analog input (0-4095 counts, 0-3.3 V). Input parameters: - `channel` (string, required) ### `measure_current` (~32 tokens) Sample the servo-rail current continuously; returns peak, mean and min mA. Input parameters: - `seconds` (number) ### `set_protection` (~65 tokens) Set the rail trip limits (0 disables either). Overcurrent is capped at 7500 mA: the board's continuous budget is ~5 A. Resets at power-up. Input parameters: - `overcurrent_ma` (integer, required) - `undervoltage_mv` (integer) ### `clear_faults` (~26 tokens) Clear a latched overcurrent/undervoltage fault so channels can move again. Output parameters: - `result` (string) ### `upload_script` (~269 tokens) Compile a servo script and store it in the board's flash, where the firmware runs it without a PC (autorun: also start at every power-up). One statement per line; channels by number or name; times in ms or '1.5s': label: jump/loop target move [