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nodejs-repl-mcp

nodejs-repl-mcp

by unfallenwill
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

Remove REPL session

remove_session

Stop a persistent Node.js REPL session by killing its worker process, while keeping the workspace directory and installed dependencies intact.

Instructions

Stop and remove a session (kills its worker process). The session workspace directory is kept, so installed dependencies and written files survive.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

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

Input Schema

NameRequiredDescriptionDefault
nameYesSession name to remove

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4.1/5.0
Behavior4/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It explicitly states the destructive effect ('kills its worker process') and the non-destructive persistence ('workspace directory is kept... dependencies and written files survive'), which goes well beyond what the name and schema alone communicate.

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 two sentences with no wasted words. It front-loads the primary action and side effect, then adds the important persistence detail. Every sentence earns its place.

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

Completeness5/5

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

For a simple one-parameter destructive tool, the description is complete: it states what is removed, the side effect on the worker process, and what survives. There is no output schema, but for this tool the return value is not essential to correct invocation.

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?

The only parameter, 'name', is already fully documented in the schema with 'Session name to remove', giving 100% schema description coverage. The tool description adds no additional parameter-level meaning beyond the schema, so it meets but does not exceed the baseline.

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?

The description uses a specific verb-resource pair ('Stop and remove a session') and adds a distinguishing side effect: 'kills its worker process'. This clearly separates it from siblings like create_session, list_sessions, and exec, so the agent knows exactly what this tool does.

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

Usage Guidelines3/5

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

The usage context is implied: use this when you want to terminate and remove a REPL session. However, it does not explicitly name alternatives or state when not to use it, so the agent must infer when this tool is the right choice among the siblings.

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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