MCP J-Link Server

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jlink_step

Execute a single CPU instruction during debugging when the processor is paused, enabling precise control over program flow analysis.

Instructions

執行單一指令（單步執行）。CPU 必須處於暫停狀態。

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "jlink_step"
  }
}

Input Schema

Name	Required	Description	Default
No arguments

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Mar 21, 2026

TDQS

A4.1/5.0

Behavior3/5

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

No annotations are provided, so the description carries full burden. It discloses a critical behavioral constraint (CPU must be paused) which is valuable. However, it doesn't mention other important traits like whether this affects program state permanently, what happens after execution (CPU remains paused?), error conditions, or rate limits. For a debugging tool with zero annotation coverage, this is minimal but adequate.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is extremely concise (one sentence) and front-loaded with the core purpose. Every word earns its place: it states what the tool does and the prerequisite condition without any fluff or repetition.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool has 0 parameters, 100% schema coverage, and an output schema exists, the description is reasonably complete. It covers the core purpose and a critical prerequisite. However, as a debugging tool with no annotations, it could benefit from mentioning what the step executes (e.g., CPU instruction) or what the output contains, though the output schema may cover that.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has 0 parameters with 100% schema description coverage, so the baseline is 4. The description doesn't need to explain parameters, and it doesn't add any parameter-specific information beyond what's already covered by the empty schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('執行單一指令' - execute single instruction) and the resource/context ('單步執行' - single-step execution). It distinguishes from siblings like 'jlink_go' (continuous execution) and 'jlink_halt' (pause). However, it doesn't specify what type of instruction or at what level (CPU instruction, assembly, etc.), keeping it from being fully specific.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description explicitly states when to use this tool: 'CPU 必須處於暫停狀態' (CPU must be in paused state). This provides clear prerequisites and distinguishes it from tools like 'jlink_go' which requires CPU to be running. It implicitly suggests alternatives like 'jlink_go' for continuous execution.

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