MCP J-Link Server

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

With no annotations provided, the description carries the full burden. It explains the connection behavior (local vs. remote, single vs. multiple probes) but lacks details on permissions, error handling, or what happens if connection fails. It mentions jlink_list_emulators as a way to get serial numbers, adding some context, but doesn't cover all behavioral aspects like timeouts or authentication needs.

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?

The description is well-structured and front-loaded: the first sentence states the purpose, followed by usage rules for parameters. The Args section is clearly labeled and provides necessary details without redundancy. Every sentence adds value, and there's no wasted text.

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?

Given the tool has an output schema (which likely describes the connection result), the description doesn't need to explain return values. It covers the core functionality and parameter usage adequately. However, as a connection tool with no annotations, it could benefit from more behavioral context (e.g., idempotency, connection persistence), though the output schema may fill some gaps.

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 explains both parameters: serial_no (J-Link probe serial number, obtainable from jlink_list_emulators) and ip_addr (remote J-Link IP address and port in format '192.168.1.100:19020'). This adds meaningful semantics beyond the bare schema, though it doesn't detail all edge cases (e.g., what if both parameters are provided).

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 clearly states the action ('開啟與 J-Link 探針的連線' - open connection to J-Link probe) and specifies the resource (J-Link probe). It distinguishes from siblings like jlink_close (close connection) and jlink_connect (likely a different connection method), making the purpose specific and differentiated.

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?

The description provides explicit guidance on when to use parameters: '若只有一支探針連線，可不指定參數' (if only one probe is connected, parameters can be omitted) and '若有多支探針，需透過序號指定' (if multiple probes, specify via serial number). It also mentions an alternative method for remote connections via IP address, giving clear context for usage decisions.

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