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ForeverJin

MCP Server for Segger RTT via J-Link

by ForeverJin

jlink_connect

Connect to a J-Link debugger and begin RTT monitoring. Required before reading or writing RTT data.

Instructions

Connect to J-Link debugger and start RTT monitoring. Must be called before reading or writing RTT data.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
speedNoJTAG/SWD speed in kHz (default: 4000).
deviceNoTarget device name (default: Cortex-M0+). Examples: HC32L19x, STM32F103, Cortex-M0+, etc.Cortex-M0+
serialNoJ-Link serial number (optional). If not provided, connects to first available J-Link.
Behavior3/5

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

No annotations provided, so description carries full burden. Discloses the main behavior (connect and start RTT monitoring) but does not detail side effects, connection management, or error conditions.

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?

Single sentence, no wasted words, and the critical prerequisite is front-loaded. Perfectly concise.

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 low complexity (3 params, no output schema), the description adequately covers the tool's purpose and usage order. Could mention return value or state, but not required.

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

Parameters3/5

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

Schema description coverage is 100%, so baseline is 3. The description adds no extra parameter meaning beyond the schema, which already includes defaults and examples.

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

Purpose5/5

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

Clearly states the verb 'Connect' and resource 'J-Link debugger and start RTT monitoring'. Distinguishes from siblings like jlink_disconnect by specifying it is a prerequisite for RTT operations.

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

Usage Guidelines4/5

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

Explicitly states it must be called before reading/writing RTT data, providing clear when-to-use context. Does not mention alternatives or when not to use, but the sibling tools imply the usage sequence.

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

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