baudrate_autodetect

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the burden and does so well: it discloses the USB CDC no-op behavior and its rationale (baud rate is not in the data path), the silent-device case, and that offline scoring avoids occupying the port. It does not state whether the port must be free/exclusive (potential conflict with serial_open) or the time cost implied by sample_s across candidates.

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?

Front-loads the core behavior, then adds the offline and silent-device cases before the USB CDC caveat. Generally tight, though the ★ section is somewhat verbose and slightly repetitive about repeated byte reads.

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?

For a hardware-detection tool with an output schema (return values need not be explained) and no annotations, the behavioral coverage is strong. Remaining gaps are sample_s semantics and port exclusivity/timing expectations.

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 0%, so the description must compensate. It adds real meaning for log_text (triggers offline mode) and candidates (explicit list to force scanning, with a concrete example), but says nothing about sample_s and only implicitly covers port.

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?

States a specific verb and resource ('自动探测波特率' - auto-detect baud rate) plus the mechanism (open port at each candidate, sample, score by log-likeness, recommend). It is clearly distinguishable from siblings like serial_open/serial_read, which do not perform detection.

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?

Explicitly routes the agent: supply log_text to use offline scoring that does not occupy the port; tell the user to reset when the device is silent; and on USB CDC ports the tool short-circuits, with the escape hatch being an explicit candidates list. Both when-to-use and when-not-to-use are covered.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.