MCP J-Link Server

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

With no annotations provided, the description carries full burden for behavioral disclosure. It states this is a write operation but doesn't mention important behavioral aspects: whether this requires the target to be halted, if it affects program execution, what permissions are needed, or what happens on invalid register/value combinations. The description is minimal and lacks crucial operational context.

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 appropriately concise with a clear purpose statement followed by parameter explanations. The two-sentence structure is efficient with no wasted words. It could be slightly improved by front-loading more critical information about when to use the tool, but within its current scope, it's well-structured.

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 this is a write operation to CPU registers (a potentially sensitive operation) with no annotations and an output schema (which handles return values), the description is moderately complete. It explains what the tool does and parameter semantics well, but lacks important contextual information about when/how to use it safely, prerequisites, and behavioral constraints that would be crucial for an AI agent.

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 description adds significant semantic value beyond the schema. The schema only shows 'register' as an integer and 'value' as an integer with 0% description coverage. The description provides the critical mapping: 'register: 暫存器索引（0=R0, ..., 13=SP, 14=LR, 15=PC）' which explains the register numbering scheme, and clarifies 'value: 要寫入的 32 位元值' indicating it's a 32-bit value. This compensates well for the schema's lack of documentation.

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: '寫入值到指定的 CPU 暫存器' (Write value to specified CPU register). It uses a specific verb ('寫入' - write) and identifies the resource (CPU register). However, it doesn't explicitly distinguish itself from its closest sibling 'jlink_register_read', which would have earned a 5.

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 no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., connection must be established), nor does it differentiate from similar tools like 'jlink_memory_write' or explain when register writes are appropriate versus memory writes.

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