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YawLabs

SSH MCP Server

by YawLabs

ssh_multi_exec

Execute a single command across multiple remote hosts in parallel and receive per-host results, speeding up multi-server tasks.

Instructions

Execute a command on multiple remote hosts in parallel. Returns results per host. Use this instead of calling ssh_exec multiple times — it's faster and shows results side by side. Subject to SSH_MCP_COMMAND_WHITELIST / SSH_MCP_COMMAND_BLACKLIST if configured (policy is checked once before fan-out).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
hostsYesList of SSH hostnames or IPs
commandYesShell command to execute on all hosts
portNoSSH port (default: 22)
usernameNoSSH username (default: current user)
privateKeyPathNoPath to SSH private key
passwordNoSSH password. STRONGLY prefer key-based auth (privateKeyPath or ssh-agent). Passwords pass through MCP protocol frames as plaintext and may be logged by the transport or host process.
timeoutNoCommand timeout in milliseconds (default: 30000)
Behavior3/5

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

No annotations provided, so description carries the burden. It discloses parallel execution, per-host results, and policy checking. However, it lacks details on error handling, partial failures, or rate limits. Adequate but not comprehensive.

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?

Description is three sentences: purpose, usage guidance, policy note. No unnecessary words, well front-loaded. Every sentence adds value.

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?

Moderate complexity with 7 parameters and no output schema or annotations. Description covers core purpose and usage but omits return format and error behavior. Lacks some completeness for a tool of this scope.

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?

Input schema has 100% description coverage for all 7 parameters. The tool description adds no extra parameter semantics beyond what the schema already provides. Baseline score of 3 is appropriate.

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?

Description clearly states it executes a command on multiple remote hosts in parallel and returns results per host. It distinguishes itself from ssh_exec by specifying 'multiple' and 'in parallel'.

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 recommends using this tool instead of calling ssh_exec multiple times, citing speed and side-by-side results. Also mentions policy check once before fan-out. No explicit when-not-to-use, but the guidance is clear.

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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