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danielecr

SSH Real MCP Server

by danielecr

ssh_execute

Execute remote commands via SSH, returning output, with automatic support for ssh-agent, ProxyCommand, and ~/.ssh/config.

Instructions

Execute a command on a remote server via SSH and return the output. Uses the system SSH binary so ssh-agent, ProxyCommand, and ~/.ssh/config are honoured automatically.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
hostYesSSH server hostname or IP address (e.g., 'dev234' or '192.168.1.100')
portNoSSH server port (default: 22)
usernameNoSSH username (e.g., 'username'). Defaults to the current OS user.
commandYesCommand to execute on the remote server
timeoutNoCommand timeout in milliseconds (default: 30000)
agentForwardNoEnable SSH agent forwarding (default: false)
extraArgsNoExtra SSH arguments (e.g., ['-o', 'StrictHostKeyChecking=no'])
Behavior3/5

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

Discloses that it uses the system SSH binary and honors ssh-agent, ProxyCommand, and config. However, missing details on error handling, stderr capture, exit codes, and output format beyond 'return the output'.

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?

Two sentences, no filler. The first sentence states purpose, the second adds important behavioral context. Efficiently structured.

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

Completeness3/5

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

No output schema, yet the description does not specify the return format (stdout/stderr, exit code). Parameter description is covered, but output behavior is left vague, reducing completeness for a tool with 7 parameters.

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 does not add significant meaning beyond the parameter descriptions already present.

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 clearly states the tool executes a command via SSH and returns output. It distinguishes from the sibling ssh_test by focusing on command execution rather than connectivity testing.

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?

No explicit guidance on when to use this tool versus ssh_test or alternatives. The description implies usage but lacks 'when not to use' or explicit context.

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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