MCP J-Link Server

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

No annotations are provided, so the description carries the full burden. It discloses one important behavioral trait: the CPU must be halted. However, it doesn't mention other potential behavioral aspects like whether this requires specific permissions, what happens if the CPU isn't halted, whether it's a read-only operation, or what the return format looks like. The description is minimal but doesn't contradict any annotations.

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 extremely concise - just two short sentences that each earn their place. The first sentence states the purpose, the second states the prerequisite. There's zero waste or redundancy. It's appropriately sized for a simple tool.

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 that this is a read operation with 0 parameters and an output schema exists, the description is reasonably complete. It states what the tool does and the prerequisite condition. However, for a tool that reads hardware registers (which could have complex output), the description doesn't hint at what kind of data structure or format to expect in the output, relying entirely on the output schema.

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?

The tool has 0 parameters, and the input schema has 100% description coverage (though empty). The description appropriately doesn't discuss parameters since none exist. It focuses on the tool's purpose and prerequisites instead. For a zero-parameter tool, this is sufficient.

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 tool's purpose: '讀取所有 CPU 暫存器的值' (Read all CPU register values). It specifies the verb ('讀取' - read) and resource ('所有 CPU 暫存器' - all CPU registers). However, it doesn't explicitly differentiate from its sibling 'jlink_register_read', which appears to read individual registers rather than all registers.

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 clear context for when to use this tool: 'CPU 必須處於暫停狀態' (CPU must be in halted state). This is an important prerequisite. However, it doesn't explicitly mention when NOT to use it or compare it to alternatives like 'jlink_register_read' for reading individual registers.

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