Monitor serial output from connected hardware for a set duration, returning captured data and anomalies.
Monitor serial output for a duration, returning output and anomalies.
| Name | Required | Description | Default |
|---|---|---|---|
| duration_seconds | No | How long to monitor (max 300 seconds, default 30). |
Changes observed during successful MCP inspections.
v0.4.0Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds that monitoring is time-bounded and that anomalies are surfaced, which is real behavioral context beyond the annotations, but it says nothing about how anomalies are detected, whether monitoring blocks, or what happens if the port is busy.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
One sentence, front-loaded with the verb and resource, with the return value appended. Nothing is padded or redundant.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With no output schema, the description carries the burden of describing the return, and 'output and anomalies' is too vague to know what an agent will actually receive or how to interpret anomalies. For a single-optional-param read tool with full annotations the rest is adequate, but the return contract is under-specified.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% and the single parameter is fully documented (max 300, default 30), so the baseline is 3. The description's phrase 'for a duration' merely restates the parameter without adding format or interaction detail.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description states a specific verb ('monitor') and resource ('serial output') and adds scope ('for a duration') plus the return payload ('output and anomalies'). It implicitly separates itself from serial_read (one-shot) and serial_wait_for (pattern wait), but never names a sibling, so an agent must infer the boundary.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
There is no when-to-use guidance, no when-not-to-use, and no mention of alternatives among the eight serial_* siblings. An agent cannot tell from this text whether to pick serial_monitor, serial_read, or serial_wait_for for a given need.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.