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mcp-ssh-server

A standalone stdio MCP server that turns SSH host management and remote command execution into MCP tools. It also ships an interactive / batch CLI (remote-ssh-cli) for managing SSH hosts on the local machine.

简体中文文档见 README.zh-CN.md。

This is a Node.js re-implementation of the SSH-host half of a FastAPI project (app/services/llm_tools.py + app/utils/ssh_helper.py + app/models/host.py) — without the backend, without the database, without a network service. Any MCP client (Claude Desktop, Continue, a custom agent, …) can start it with npx and talk to it over JSON-RPC.

Highlights

  • Fully standalone — its own encrypted JSON store (~/.mcp-ssh-server/hosts.json); no FastAPI backend, no database.

  • No native dependencies — Node's built-in crypto for AES-256-GCM, pure-JS ssh2 for SSH; runs on Windows / macOS / Linux.

  • Standards-compliant stdio MCP — speaks the Model Context Protocol stdio transport and can be launched with npx.

  • Credentials never leave the server — host tool responses never contain a password or a private key; the SSH tools decrypt them internally to open a connection and never echo them back.

  • Connection pooling — one live SSH session per host, reused across commands and playbook steps.

  • Pool monitoring — pool_status renders the live pool as a desensitized table: uid, name, connection state, executed / failed commands and the last command (secrets and IP addresses masked).

  • CLI companion — remote-ssh-cli manages the very same store (interactive TUI, batch commands, CSV bulk import) and can monitor the connection pool live (one frame per second, q quits).

Related MCP server: SSH MCP Server

MCP tools

Nine tools are published:

Tool

Description

cli_help

Installation / usage / troubleshooting notes for remote-ssh-cli, optionally narrowed down with topic

host_list

List the known hosts — only sys_name and uid (no address, user name or credential); uid is the host_id every other tool expects

host_create

Add a host (password / private key / passphrase are encrypted at rest)

host_update

Patch host fields (omitted credential fields keep their current value)

host_delete

Delete a host

ssh_run_command

Run a single non-interactive command on a host

ssh_run_interactive

Run a command that answers prompts (sudo, …) through expect/answer pairs

ssh_run_playbook

Run a multi-step playbook (structured # @… directives or legacy expect:/answer: lines)

pool_status

Monitor the live connection pool — one desensitized row per host (uid, name, state, executed / failed commands, last command)

The host identifier contract

  • host_list is the entry point: every host comes back as exactly two fields — sys_name (the name) and uid (the unique identifier).

  • Every other tool takes that same value under the name host_id. Pass it back unchanged; never assemble or guess one.

  • When an id does not resolve, the tool answers with an actionable error: Host '<id>' not found. host_id must be the exact 'uid' value returned by host_list — call host_list to obtain the valid identifiers. Call host_list again and retry with the value it returns.

  • host_get is deliberately not published to MCP clients: the model only ever sees sys_name + uid, never one host's address, user name or credential. The CLI keeps its own get subcommand for human operators.

Arguments at a glance

Tool

Arguments

cli_help

topic? — one of install, list, get, create, update, delete, import, monitor, tui, windows

host_list

enabled_only? (bool)

host_create

ip_address (required), system_name?, ssh_port? (1-65535, default 22), ssh_username? (default root), ssh_auth_method? (password | pubkey), ssh_password?, ssh_private_key?, ssh_private_key_passphrase?, is_enable? (default true)

host_update

host_id (required) plus any of the fields above — an omitted field keeps its current value

host_delete

host_id

ssh_run_command

host_id, command, timeout_seconds (1-600, required)

ssh_run_interactive

host_id, command, expects? ([{ expect, answer }]), timeout_seconds

ssh_run_playbook

host_id, content (the multi-line playbook body), timeout_seconds

pool_status

host_id? (one host only), format? (table | json), include_history? (bool), include_idle_hosts? (bool)

ip_address is unique across the store — creating a duplicate fails.

Command results come back as a plain text block:

[stdout]
hello
[stderr]
[exit_code=0 success=true duration_ms=42]

Quick start

git clone https://github.com/xlbbb-cn/mcp_ssh_exec_cmd.git
cd mcp_ssh_exec_cmd
npm install
npm run build

The build output lands in dist/ and provides two binaries:

Binary

Entry point

Purpose

remote-ssh-server

dist/index.js

the stdio MCP server (started by your MCP client)

remote-ssh-cli

dist/cli.js

interactive / batch host-management CLI

Install

The package is published to two registries under the same name, @xlbbb-cn/mcp_ssh_exec_cmd:

Registry

Install command

Auth

npmjs.org (recommended)

npm install -g @xlbbb-cn/mcp_ssh_exec_cmd

none — the public registry needs no token

GitHub Packages

npm install -g @xlbbb-cn/mcp_ssh_exec_cmd --registry=https://npm.pkg.github.com

a personal access token (classic) with read:packages

GitHub Packages requires authentication for installs as well — even for public packages — so give npm a token first:

npm login --scope=@xlbbb-cn --auth-type=legacy --registry=https://npm.pkg.github.com
# Username: <your GitHub username>
# Password: <your PAT>

The same thing can be written into ~/.npmrc:

//npm.pkg.github.com/:_authToken=<PAT>
@xlbbb-cn:registry=https://npm.pkg.github.com

Global install (CLI)

From a local checkout:

npm run build
npm install -g --allow-scripts=ssh2,cpu-features .

Or straight from a registry:

npm install -g @xlbbb-cn/mcp_ssh_exec_cmd                                      # npmjs.org
npm install -g @xlbbb-cn/mcp_ssh_exec_cmd --registry=https://npm.pkg.github.com  # GitHub Packages

Afterwards remote-ssh-cli is on your PATH:

remote-ssh-cli                        # interactive TUI
remote-ssh-cli list                   # JSON list of every host
remote-ssh-cli get <host_id>
remote-ssh-cli create <json-file>
remote-ssh-cli update <host_id> <json-file>
remote-ssh-cli delete <host_id>
remote-ssh-cli import <csv-file> [--dry-run]
remote-ssh-cli monitor                # live connection-pool monitor (q quits)

create / update take a JSON file, e.g.:

{
  "ip_address": "192.168.1.100",
  "system_name": "web-01",
  "ssh_port": 22,
  "ssh_username": "root",
  "ssh_auth_method": "password",
  "ssh_password": "your-password"
}

CSV bulk import

remote-ssh-cli import hosts.csv turns every row of the file into one host. The first line must be a header row containing at least an ip_address column:

ip_address,system_name,ssh_port,ssh_username,ssh_auth_method,ssh_password
192.168.1.100,web-01,22,root,password,secret
192.168.1.101,db-01,2222,deploy,password,secret

Column

Description

Default

ip_address

required, host address, unique across the table

—

system_name

display name

empty

ssh_port

SSH port

22

ssh_username

SSH user name

root

ssh_auth_method

password / pubkey

password

ssh_password

plain-text password (encrypted before it hits the disk)

—

ssh_private_key

plain-text private key (encrypted before it hits the disk)

—

ssh_private_key_path

path to a key file (alternative to ssh_private_key)

—

ssh_private_key_passphrase

passphrase protecting the key (encrypted before it hits the disk)

—

is_enable

true/false/1/0/yes/no

true

  • Column names are case-insensitive and accept aliases (ip, host, name, port, user, password, …).

  • Quoted commas, embedded newlines and "" escapes are parsed per RFC 4180, so private key material is never mangled.

  • A bad row never aborts the batch: every row ends up reported as created / skipped (duplicate IP) / failed (invalid data). The command prints a summary and exits with code 1 when at least one row failed.

  • --dry-run only validates and reports — nothing is written.

  • The CSV template (header + example row) is printed in the remote-ssh-cli banner, and remote-ssh-cli import without a file argument prints the same thing.

Windows note: if you hit JScript runtime error (800A03EA), make sure npm is >= 10.8.0 or run the command from cmd.exe instead of PowerShell — the .ps1 wrapper npm generates may not invoke node explicitly on older npm versions. Both entry points ship a #!/usr/bin/env node shebang.

Monitor the connection pool

remote-ssh-cli monitor opens a live view of the SSH connection pool. The screen is redrawn once per second and the view is left with the q key (Ctrl+C works as well):

SSH connection pool monitor · 15:05:31 · tick 42 · refresh 1000ms · last tick 41ms
pool 2/32 connections · idle timeout 1m00s · probe timeout 5s · press q to quit

HOST          ADDRESS       USER   STATUS    LATENCY  LAST OK  POOL
------------  ------------  -----  --------  -------  -------  ----
web-01        192.168.1.100 root   up        12ms     15:05:30 1m05s
db-01         10.0.0.5:2222 deploy down      8ms      -        -

problems (1):
  db-01 (10.0.0.5:2222): connect ECONNREFUSED 10.0.0.5:2222

Column

Meaning

STATUS

up (the probe succeeded), down (the connection failed) or disabled (the host is switched off — it is listed but never probed)

LATENCY

how long the last probe took, end to end

LAST OK

clock time of the last successful probe

POOL

age of the pooled connection — how long the session has been reused without being re-established

  • The monitor keeps the pool warm: every host is probed through the very same ConnectionPool the SSH tools use, so the connections it shows are real, reusable sessions.

  • The CLI runs its own pool — the MCP server is a separate process, so its connections cannot be inspected from the terminal.

  • The default probe command is echo (it exists in a POSIX shell and in cmd.exe); every probe runs once per interval, so keep --interval reasonable on large host lists.

  • Without a terminal (a pipe, a CI job) the monitor prints a single frame instead of looping — there would be no key to stop it.

Option

Description

Default

--interval <ms>

redraw interval

1000

--timeout <s>

per-host probe timeout (1-600 s)

5

--probe-cmd <cmd>

command used to probe a host

echo

--host <host_id>

monitor only this host (repeatable)

all hosts

--all

also list disabled hosts (never probed)

off

--once

print a single frame and exit

off

The same view is available from the interactive TUI (7) Monitor connection pool).

Register it with an MCP client

~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "ssh": {
      "command": "npx",
      "args": ["-y", "-p", "@xlbbb-cn/mcp_ssh_exec_cmd", "remote-ssh-server"]
    }
  }
}

On GitHub Packages, add the registry to the same snippet:

"args": [
  "--registry=https://npm.pkg.github.com",
  "-y",
  "-p",
  "@xlbbb-cn/mcp_ssh_exec_cmd",
  "remote-ssh-server"
]

The file: form points npx straight at your local checkout — handy while developing, and it needs no registry at all:

"args": ["-y", "-p", "file:./mcp_ssh_exec_cmd", "remote-ssh-server"]

Configuration

Everything is configured through environment variables:

Variable

Description

Default

MCP_SSH_MASTER_KEY

32-byte key as a hex string (64 hex characters). Back this up: changing it — or moving to another machine — makes every credential in hosts.json undecryptable

generated on first start and stored in <config_dir>/master.key

MCP_SSH_CONFIG_DIR

override the configuration directory

~/.mcp-ssh-server

MCP_SSH_POOL_IDLE_MS

how long an idle pooled connection is kept (ms). 0 disables pooling entirely, so every command opens a fresh connection

60000

MCP_SSH_POOL_MAX_HOSTS

how many hosts the pool keeps alive (the least recently used idle connection is evicted beyond this)

32

SSH connection pool

  • Every host keeps one SSH connection; consecutive commands and the steps of a playbook reuse it instead of reconnecting.

  • The pool is keyed on the host id plus a fingerprint of the credentials. Changing the address, port, user name, auth method, password or key invalidates the cached connection right away; host_update and host_delete drop it explicitly.

  • Idle connections are closed after MCP_SSH_POOL_IDLE_MS. A connection the peer dropped in the meantime is transparently re-established on the next use (one retry).

  • All pooled connections are closed when the process exits (i.e. when the MCP client disconnects).

  • remote-ssh-cli monitor shows the pool live (see Monitor the connection pool); it honours the same two environment variables.

Monitoring the pool from MCP

pool_status renders the state of the MCP server's own pool as a table — one row per host that has a pooled connection or command traffic:

SSH connection pool · 1/32 connections · idle timeout 1m00s · 2 commands executed · 1 failed · updated 15:24:16
Commands and error messages are desensitized (secrets masked, IP addresses replaced).

UID                                   SYS_NAME  STATE   EXECUTED  FAILED  LAST CMD                 LAST RESULT  LAST ERROR                     LAST RUN  POOL AGE
------------------------------------  --------  ------  --------  ------  -----------------------  -----------  -----------------------------  --------  --------
9bcb7682-537b-4837-8b9e-6e37b4c61cdc  web-01    pooled  3         1       systemctl restart nginx  exit=1       connect to *** port 22 failed  12s ago   1m05s

Column

Meaning

UID

the host id — the same value host_list returns as uid

SYS_NAME

the host name

STATE

pooled (a live, idle connection), busy (a command is running), down (the connection broke), idle (commands ran, no connection open), new (never used)

EXECUTED / FAILED

how many commands ran on the host, and how many of them failed

LAST CMD / LAST RESULT

the last command and its outcome (ok, exit=1, timeout, error)

LAST ERROR

the redacted error message of the last failure

LAST RUN

how long ago the last command ran

POOL AGE

how long the pooled connection has been reused

  • The table is desensitized: credentials are masked (mysql -pS3cret → mysql -p***), IP addresses are replaced (10.0.0.5 → ***), and no address, port, user name or credential of a host is ever shown.

  • format: "json" returns the same information as a JSON document, include_history: true adds the most recent commands per host, include_idle_hosts: true also lists hosts without traffic, and host_id narrows the view to a single host.

  • The counters live in the server process: they describe the commands this MCP server ran and are reset when it restarts. The CLI monitor is a separate process and shows its own pool.

Timeout semantics

timeout_seconds is a hard cap: when it expires the command is terminated and the result reports success=false, exit_code=null plus a note in stderr. For ssh_run_playbook the value is the budget for the whole playbook — every step only gets the time that is left.

Playbook format

ssh_run_playbook accepts a multi-line body. Two formats are supported.

Structured — directives start with # @:

# @section "Restart nginx"
# @desc "Reload the reverse proxy after the config change"
systemctl stop nginx
# @on "systemctl start nginx"
expect: [sudo] password for deploy:
answer: secret
# @note "the site is back up"
# @danger "this drops active connections"

Directive

Meaning

# @section "Title"

group the following steps under a section

# @desc "…"

description of the current section

# @note "…"

note attached to the current step

# @danger "…"

danger warning attached to the current step

# @on "command"

run this command interactively (answers the expect:/answer: pairs that follow)

Legacy — one command per line, optionally followed by expect: / answer: pairs:

sudo systemctl restart nginx
expect: [sudo] password for deploy:
answer: secret

Ordinary # comments are ignored. A playbook stops at the first non-zero exit code and returns the transcript of every step that ran.

Storage & security

  • hosts.json — all host records as plain JSON. The metadata fields are stored in clear text; ssh_password, ssh_private_key and ssh_private_key_passphrase hold base64 ciphertext.

  • master.key — the 32-byte master key (mode 0o600 on POSIX).

  • Writes go through a .tmp file plus a rename, so a crash never leaves a half-written file behind.

Secrets are encrypted with AES-256-GCM using a key derived from the master key with PBKDF2-SHA-256 (200k iterations, 16-byte random salt). The layout is [16-byte salt][12-byte IV][16-byte tag][ciphertext]; salt and IV are fresh for every encryption, so the same plaintext never produces the same ciphertext twice.

Keep the whole directory out of version control:

# mcp-ssh-server state
.mcp-ssh-server/

Project layout

src/
  index.ts        MCP entry point — stdio transport, tool registration, dispatch
  cli.ts          remote-ssh-cli — interactive TUI + batch subcommands
  monitor.ts      live connection-pool monitor (one frame per second, q quits)
  pool.ts         ConnectionPool — one live SSH connection per host + the command counters
  ssh.ts          ssh2 execution primitives + playbook parser/runner
  storage.ts      HostStore — hosts.json load/save with an atomic full-file rewrite
  csv.ts          RFC 4180 CSV reader + host-row mapping
  importer.ts     bulk-import orchestration
  crypto.ts       AES-256-GCM encryption of secrets at rest
  master_key.ts   master-key resolution (env var or key file)
  paths.ts        configuration-directory paths
  redact.ts       masks secrets and IP addresses in commands and error messages
  tools/
    _types.ts     shared MCP tool shape + the host-identifier wording
    hosts.ts      host_list / host_create / host_update / host_delete
    ssh_exec.ts   ssh_run_command / ssh_run_interactive / ssh_run_playbook
    pool_status.ts  pool_status — the desensitized pool table
    help.ts       cli_help
test/
  smoke.mjs         encryption round-trip, HostStore CRUD, playbook parsing
  features_smoke.mjs  CSV parsing/import, connection pool behaviour
  monitor_smoke.mjs   monitor frames, the refresh loop, the 'q' shortcut
  mcp_smoke.mjs     end-to-end JSON-RPC handshake against a spawned server

Development

npm run dev    # tsc --watch
npm run build  # tsc  (the only typecheck)
npm test       # all four smoke tests

npm run build is the verification step — there is no separate lint or format configuration. The tests execute dist/, so build before testing.

Smoke tests

npm test runs four plain Node scripts; none of them needs a real SSH server:

  • test/smoke.mjs — encrypt/decrypt round-trip, the full HostStore CRUD path (encrypt on write, read back, list, update, delete) and playbook parsing for both formats.

  • test/features_smoke.mjs — CSV parsing and host-row mapping, bulk import (including --dry-run and duplicate-IP skipping), connection-pool reuse / credential-change invalidation / idle eviction, playbook parsing edge cases, the redaction of commands and errors, and the pool_status table.

  • test/monitor_smoke.mjs — the connection-pool monitor: frame rendering, the one-frame-per-interval loop, the q shortcut, the SSH probe (against a fake client) and the pool snapshot.

  • test/mcp_smoke.mjs — spawns the MCP server as a child process, performs the JSON-RPC handshake and asserts that all 9 tools are registered, that host_list exposes only sys_name + uid, that host_get is not advertised, that pool_status returns a desensitized table, and that no password ever appears in a response.

Run a single file with node test/<file>.mjs. Every test isolates its state in a temporary MCP_SSH_CONFIG_DIR, so your real hosts.json is never touched.

Releasing

Releases are published to npmjs.org, GitHub Packages and the official MCP Registry (registry.modelcontextprotocol.io) by a GitHub Actions workflow (.github/workflows/publish.yml). The two package jobs build, run the smoke tests and publish with npm provenance attached to the tarball; the third job then publishes server.json to the MCP Registry, which is what directories mirroring the registry (Glama, PulseMCP, …) list the server from.

The MCP Registry job runs after the npmjs.org job because the registry verifies npm ownership by reading the mcpName marker out of the published package: mcpName in package.json must always equal server.json's name (asserted by test/features_smoke.mjs), and CI re-syncs the version in server.json from package.json before publishing.

# 1. bump the version in package.json, commit
git commit -am "chore: release v0.1.1" && git push github master

# 2. tag it — the tag triggers the publish workflow
git tag v0.1.1
git push github v0.1.1

Registry

Credential

Where it comes from

GitHub Packages

GITHUB_TOKEN

built into the workflow, nothing to configure

npmjs.org

trusted publishing (OIDC)

configured once on npmjs.org: Packages → @xlbbb-cn/mcp_ssh_exec_cmd → Settings → Trusted publisher → user xlbbb-cn, repository mcp_ssh_exec_cmd, workflow filename publish.yml. No secret needed — the workflow exchanges the short-lived GitHub OIDC token for a publish token.

npmjs.org (fallback)

NPM_TOKEN

repository secret (Settings → Secrets and variables → Actions). Must be a granular npm token with Read and write on the @xlbbb-cn scope and Bypass 2FA enabled — a regular user token makes npm answer with EOTP (one-time password required). Only needed until the trusted publisher is set up.

MCP Registry

GitHub OIDC

built into the workflow, no secret: the publish-mcp-registry job runs mcp-publisher login github-oidc and mcp-publisher publish after the npmjs.org job. The mcp-publisher binary version is pinned in publish.yml — bump it deliberately.

Without either the NPM_TOKEN secret or a configured trusted publisher the npmjs.org job fails with an actionable error message.

The fallback token can be created from the CLI (it needs your 2FA code once):

npm token create --scopes=xlbbb-cn --packages-and-scopes-permission=read-write \
                 --bypass-2fa --otp=<your-2fa-code>

--bypass-2fa is what keeps npm from asking for a one-time password on every publish; without it the registry answers with EOTP.

Once trusted publishing works, the NPM_TOKEN secret can be deleted and the package's Publishing access can be set to "Require two-factor authentication and disallow tokens".

The workflow can also be started by hand from the Actions tab (workflow_dispatch); tick dry_run to verify the tarball without publishing.

The published packages show up under https://github.com/xlbbb-cn/mcp_ssh_exec_cmd/packages and https://www.npmjs.com/package/@xlbbb-cn/mcp_ssh_exec_cmd.

Publishing to npmjs.org requires an npm account that owns the @xlbbb-cn scope (an npm user or organization named xlbbb-cn).

Relation to the FastAPI backend

Aspect

Python backend

This MCP server

Storage

PostgreSQL / SQLite (app.models.host)

local JSON file (~/.mcp-ssh-server/hosts.json)

Encryption

Fernet (AES-128-CBC + HMAC)

AES-256-GCM + PBKDF2

SSH client

paramiko

ssh2

Protocol

HTTP REST (/api/v1/hosts, …)

MCP (JSON-RPC over stdio)

AuthN/AuthZ

RBAC (host:* permission codes)

single-user local process, protected by file-system permissions

Sharing one storage backend is deliberately avoided: as soon as a database or an API is involved, this server can no longer run standalone — and pointing both the MCP server and the backend at the same JSON file would create consistency problems.

To migrate hosts from the FastAPI backend, write a one-off script: list /api/v1/hosts (requires host:secure:read) and feed the same field shape into this server's host_create.

Known limitations

  • The host data lives in a single JSON file that is rewritten in full on every change — fine for hundreds of hosts, not for thousands.

  • There is no concurrent-write protection: do not run two instances against the same MCP_SSH_CONFIG_DIR at the same time.

  • There is no audit log or operation trail. If you need one, capture the SSH output in the calling agent's transcript.

  • The MCP surface intentionally exposes no per-host metadata, so a model cannot look up a host's address or user name — it has to go through host_list / host_create.

Available Tools

8 tools
cli_helpA

Get help on using the remote-ssh-cli command-line tool to manage SSH hosts outside the MCP protocol. Returns installation, usage, and troubleshooting instructions for the standalone CLI.

NameRequiredDescriptionDefault
topicNoOptional topic to filter help: 'install', 'list', 'get', 'create', 'update', 'delete', 'import', 'tui', or 'windows' for troubleshooting. Omit to get the full help text.

TDQS

A3.6/5.0
Behavior3/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It discloses that the tool returns installation, usage, and troubleshooting instructions for the standalone CLI, which is useful context, but it does not mention side effects, permissions, or operational constraints. For a simple help tool this is minimally 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 two sentences with no wasted words. The core purpose and return scope are front-loaded, and the outside-MCP context is stated clearly.

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's simplicity, complete schema coverage for its single optional parameter, and the absence of an output schema, the description is nearly complete. It explains what the tool returns and its standalone-CLI scope. A minor gap is the lack of explicit confirmation that the operation is read-only and side-effect-free.

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%, and the schema already documents the optional 'topic' parameter with accepted values and the default behavior when omitted. The description adds no parameter-specific meaning beyond the schema, so the baseline score of 3 applies.

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 states a specific verb ('Get help') and resource ('remote-ssh-cli command-line tool') and clarifies the intended context: managing SSH hosts outside the MCP protocol. It distinguishes itself from the host_* and ssh_* siblings by emphasizing the standalone CLI, though it does not explicitly name alternatives.

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 description implies when to use the tool by mentioning help for the standalone CLI outside MCP, but it does not explicitly state when to prefer this tool over the MCP-based sibling tools or any exclusions. Usage is inferable rather than clearly guided.

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

host_createA

Create a new SSH host entry. The supplied password or private key is encrypted at rest and never returned by any tool. The response contains the new host's public metadata, including the uid that identifies it in host_list.

NameRequiredDescriptionDefault
ssh_portNoSSH port, default 22.
is_enableNoWhether SSH tools can target this host. Default true.
ip_addressYesUnique IP address or hostname of the host.
system_nameNoHuman-readable name (e.g. 'web-01').
ssh_passwordNoPlaintext password (encrypted at rest). Required when auth_method=password.
ssh_usernameNoSSH username, default 'root'.
ssh_auth_methodNo'password' (default) or 'pubkey'.
ssh_private_keyNoPlaintext private key (encrypted at rest). Required when auth_method=pubkey.
ssh_private_key_passphraseNoPassphrase protecting the private key (encrypted at rest). Only used with auth_method=pubkey.

TDQS

A4/5.0
Behavior4/5

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

With no annotations, the description carries the burden well by disclosing that passwords/private keys are encrypted at rest and never returned by any tool. It also states that the response contains public metadata including the uid, though it does not cover permissions, duplicate-IP behavior, or idempotency.

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?

Three sentences, front-loaded with the core action, followed by security behavior and response identity. Every sentence adds useful information without repetition or waste.

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?

For a create mutation with no annotations and no output schema, the description covers the action, sensitive-data handling, and the key returned identifier. It could say more about prerequisites or duplicate handling, but the detailed schema compensates for most field-level gaps.

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 the input schema already documents all nine parameters in detail. The description reinforces secret-handling semantics for password/private key fields but does not add parameter-level guidance beyond what the schema provides.

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 states a specific verb and resource: "Create a new SSH host entry." It also references `host_list` for the uid, helping distinguish the created host from listing behavior.

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?

Usage is implied by "Create a new SSH host entry," but the description does not explicitly say when to use this versus `host_update`, `host_delete`, or other sibling tools. The `host_list` reference explains the returned uid but not tool selection.

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

host_deleteA

Permanently delete a host entry. Call host_list first — it returns the uid of every host, and that value is what host_id expects.

NameRequiredDescriptionDefault
host_idYesIdentifier of an existing host: the exact `uid` value returned by `host_list`. Call `host_list` first and pass that value unchanged.

TDQS

A3.9/5.0
Behavior3/5

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

With no annotations present, the description must carry the behavioral burden; it does disclose that the deletion is permanent, which is the single most important trait. However, it says nothing about required permissions, whether dependent resources (credentials, SSH configs) are removed, or whether confirmation/undo exists — meaningful gaps for a destructive mutation.

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 short sentences, both load-bearing: the first establishes the destructive action, the second the required acquisition path for the identifier. Nothing is padded or repeated.

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?

For a one-parameter destructive tool with no annotations and no output schema, the description covers the workflow and irreversibility but leaves the agent uninformed about permissions and side effects on related resources. Adequate but with clear gaps on exactly the dimensions annotations would normally supply.

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 coverage is 100% and the single parameter's schema description already states it is the exact uid returned by host_list. The description's cross-reference merely restates that, adding no new syntax, format, or validation detail.

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?

States a specific verb and resource ("Permanently delete a host entry") and the adverb "permanently" conveys irreversibility up front. It is trivially separable from host_create, host_update, and host_list in the sibling set.

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?

Gives an explicit prerequisite: call host_list first to obtain the uid that host_id expects. It does not name any alternative or when-not case (e.g., use host_update to modify instead of delete), so it stops short of full routing guidance.

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

host_listA

List the SSH hosts known to the server. Each entry contains exactly two fields: 'sys_name' (the host name) and 'uid' (its unique identifier). Start here: pass a 'uid' value to the other tools as their host_id argument. No address, port, user name or credential is returned.

NameRequiredDescriptionDefault
enabled_onlyNoOnly return enabled hosts.

TDQS

A4.3/5.0
Behavior4/5

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

With no annotations, the description carries the full burden, and it does substantive work: it commits to exactly two returned fields and preempts the common misconception by stating no address, port, user, or credential comes back. It does not cover auth requirements, ordering, or empty-list behavior, which keeps it below a 5.

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?

Three tight sentences, each doing distinct work: purpose, return shape, and cross-tool routing. The most important routing cue is front-loaded with 'Start here'.

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?

There is no output schema, so the description must describe returns, and it does so precisely down to field names and deliberate exclusions. For a one-optional-parameter listing tool, an agent has everything needed to call it and consume the result.

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 coverage is 100% and the single 'enabled_only' parameter is documented in the schema itself. The description says nothing about filtering, so it adds no meaning beyond the schema; baseline 3 applies.

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?

States a specific verb and resource ('List the SSH hosts known to the server') and goes further to define the exact output shape ('sys_name' and 'uid'). It is unmistakably the enumeration tool among siblings that otherwise create, update, delete, or connect to hosts.

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?

The 'Start here' directive plus the explicit instruction to feed the returned 'uid' into other tools' host_id makes the workflow position of this tool clear. There is no explicit when-not-to-use statement, but there is little meaningful alternative to steer away from.

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

host_updateA

Update fields on an existing host. Call host_list first — it returns the uid of every host, and that value is what host_id expects. Omit a credential field to keep the current value. Supply an empty string to clear it (only valid if you also flip the auth method).

NameRequiredDescriptionDefault
host_idYesIdentifier of an existing host: the exact `uid` value returned by `host_list`. Call `host_list` first and pass that value unchanged.
ssh_portNoNew SSH port (1-65535). Omit to keep the current value.
is_enableNoEnable or disable the host. Omit to keep the current value.
ip_addressNoNew IP address or hostname. Omit to keep the current value.
system_nameNoNew human-readable name. Omit to keep the current value.
ssh_passwordNoNew plaintext password. Omit to keep current value.
ssh_usernameNoNew SSH username. Omit to keep the current value.
ssh_auth_methodNoNew auth method ('password' or 'pubkey'). Omit to keep the current value.
ssh_private_keyNoNew plaintext private key. Omit to keep current value.
ssh_private_key_passphraseNoNew passphrase for the private key. Omit to keep current value.

TDQS

A4.4/5.0
Behavior4/5

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

No annotations are provided, so the description carries the behavioral burden. It usefully explains partial update semantics for credentials and the special rule that clearing a value requires flipping the auth method. It does not mention permissions, error behavior, or whether updates are reversible.

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?

Three short sentences, front-loaded with the core action, followed by the prerequisite and credential semantics. No wasted text.

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?

For a 10-parameter mutation tool with complete schema descriptions but no output schema or annotations, the description covers the essential invocation semantics. It does not describe response shape, permission requirements, or side effects beyond credential clearing.

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?

Schema coverage is 100%, so the schema already documents parameters thoroughly. The description adds meaningful semantics beyond the schema by explaining host_id should be the uid from host_list and by clarifying empty-string clearing only when auth method changes.

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 states a specific verb and resource: updating fields on an existing host. It clearly distinguishes this from creation/deletion siblings by emphasizing existing host and field-level updates, and host_id is explicitly tied to host_list's uid.

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?

It gives a clear prerequisite to call host_list first and explains credential omission/clearing behavior. It does not explicitly contrast with host_create or state when not to use this tool, but the update context is clear.

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

ssh_run_commandA

Run a single non-interactive shell command on a remote host. Returns stdout, stderr, exit code, and duration. Call host_list first — it returns the uid of every host, and that value is what host_id expects. The model must use host_id only; connection credentials are resolved server-side and never returned. The model MUST supply timeout_seconds (1-600) appropriate for the command; the command is terminated when the timeout expires.

NameRequiredDescriptionDefault
commandYesShell command to execute on the remote host.
host_idYesIdentifier of an existing host: the exact `uid` value returned by `host_list`. Call `host_list` first and pass that value unchanged.
timeout_secondsYesHard timeout in seconds. REQUIRED. The model must estimate an appropriate timeout based on the command's complexity (1-600 seconds). The command is terminated when the timeout expires.

TDQS

A4.1/5.0
Behavior4/5

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

With no annotations, the description carries the full burden and does well: it discloses the return payload (stdout, stderr, exit code, duration), that credentials are resolved server-side and never exposed, and that the command is terminated on timeout. It does not warn that arbitrary remote command execution is potentially destructive or state whether large output is truncated, which are meaningful omissions for a mutation-capable tool with no annotations.

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

Conciseness4/5

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

Front-loaded with the core purpose in the first sentence, followed by return values and then the two hard prerequisites. All sentences are relevant, though the host_list and timeout sentences largely duplicate schema text, which is slight redundancy rather than waste.

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?

No output schema exists, and the description compensates by enumerating the return fields and the timeout termination behavior. It is nearly complete for a three-parameter execution tool; the remaining gap is how non-zero exit codes and error conditions are surfaced.

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 coverage is 100%, so all three parameters are already documented in the schema, including the host_list prerequisite and the 1-600 timeout range. The description restates that same information rather than adding new syntax or format detail, so the baseline 3 applies.

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?

States a specific verb and resource ('Run a single non-interactive shell command on a remote host') and the 'single non-interactive' qualifier implicitly distinguishes it from ssh_run_interactive and ssh_run_playbook. An agent can identify the tool's scope without opening the schema.

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?

Gives an explicit prerequisite workflow ('Call host_list first — it returns the uid'), which is genuine when-to-use guidance. It stops short of naming alternatives such as ssh_run_interactive or ssh_run_playbook as the choice for multi-step or interactive work, so the routing to siblings is left implicit.

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

ssh_run_interactiveA

Run a command on a remote host that needs to consume expect/answer prompts (e.g. sudo). Each entry in 'expects' is an object with 'expect' (the prompt text to wait for) and 'answer' (the response to send back). Call host_list first — it returns the uid of every host, and that value is what host_id expects. The model must use host_id only; credentials are resolved server-side. The model MUST supply timeout_seconds (1-600) appropriate for the command.

NameRequiredDescriptionDefault
commandYesCommand to execute on the remote host.
expectsNoList of {expect, answer} pairs in order.
host_idYesIdentifier of an existing host: the exact `uid` value returned by `host_list`. Call `host_list` first and pass that value unchanged.
timeout_secondsYesHard timeout in seconds. REQUIRED. The model must estimate an appropriate timeout based on the command's complexity (1-600 seconds). The command is terminated when the timeout expires.

TDQS

A4.2/5.0
Behavior3/5

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

With no annotations provided, the description carries the full behavioral burden. It usefully discloses that credentials are resolved server-side and that timeout_seconds causes command termination, but it does not describe failure behavior, output format, side effects, or the destructive potential of running arbitrary remote commands.

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 front-loaded with purpose and then covers the expects mechanism, required host lookup, credential handling, and timeout requirement in four compact sentences. There is little wasted text for a tool with this many calling constraints.

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?

For a command-execution tool with no output schema and no annotations, the description gives enough information to call it correctly: host_id provenance, expect/answer structure, credential handling, and timeout. It could still say more about return values or error behavior, but the essential invocation context is present.

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?

Schema coverage is 100%, so the baseline is 3, but the description adds meaningful context: host_id must be the exact uid returned by host_list, expects entries are ordered expect/answer pairs, and timeout_seconds should be estimated for the command. These additions go beyond restating the schema.

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 states a specific verb and resource: running a command on a remote host, scoped to interactive commands that consume expect/answer prompts. The phrase 'needs to consume expect/answer prompts (e.g. sudo)' makes the tool's niche clear enough to distinguish it from a plain non-interactive command runner such as ssh_run_command.

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?

It gives clear operational guidance: call host_list first, use host_id only, and always supply timeout_seconds within 1-600. It does not explicitly say when to prefer this over ssh_run_command or ssh_run_playbook, but the interactive-prompt condition strongly implies the selection boundary.

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

ssh_run_playbookA

Execute a multi-step playbook on a remote host. The 'content' field is a multi-line string. Supports structured format with directives: '# @section "Title"' to group steps into sections, '# @desc "description"' for section description, '# @note "text"' for step notes, '# @danger "text"' for danger warnings, and '# @on "command"' for interactive commands (replaces legacy 'expect:'/'answer:' syntax). Legacy format (one command per line with optional 'expect:'/'answer:' pairs) is also supported. Stops on the first non-zero exit code and returns the transcript of every step that ran. Call host_list first — it returns the uid of every host, and that value is what host_id expects. The model must use host_id only; credentials are resolved server-side. The model MUST supply timeout_seconds (1-600) — it is the budget for the WHOLE playbook, each step only gets the time that is left.

NameRequiredDescriptionDefault
contentYesMulti-line playbook body. Supports structured directives (# @section, # @desc, # @note, # @danger, # @on) or legacy expect:/answer: pairs.
host_idYesIdentifier of an existing host: the exact `uid` value returned by `host_list`. Call `host_list` first and pass that value unchanged.
timeout_secondsYesHard timeout in seconds. REQUIRED. The model must estimate an appropriate timeout based on the command's complexity (1-600 seconds). The command is terminated when the timeout expires.

TDQS

A4.2/5.0
Behavior4/5

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

With no annotations, the description carries the full burden and does well: it discloses fail-fast semantics (stops on first non-zero exit code), that a transcript of every executed step is returned, and that credentials are handled server-side. It omits any warning that these are arbitrary remote commands with side effects, which is the main residual risk an agent should know about.

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

Conciseness4/5

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

Front-loaded with the core purpose, then constraints, then format details; almost every sentence adds operational value. The run of directive definitions is list-like and could be tightened, but it is not padding.

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?

No output schema, but the description states what comes back (transcript of every step that ran), which covers the key unknown. For a 3-param tool with full schema coverage, remaining gaps (transcript shape, partial-failure return structure) are minor.

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

Parameters5/5

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

Schema coverage is already 100%, yet the description still adds meaning the schema lacks: timeout_seconds is a budget for the WHOLE playbook with each step consuming the remainder, and host_id must be the exact uid from host_list rather than a hostname. It also expands the content directives (including that @on replaces legacy expect:/answer:) well beyond the schema's one-line summary.

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 first sentence gives a specific verb and resource ("Execute a multi-step playbook on a remote host"), which implicitly separates it from ssh_run_command (single command) and ssh_run_interactive. It never names those siblings explicitly, so the differentiation is inferred rather than stated.

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?

Strong prerequisites and constraints: call host_list first, use only host_id, credentials resolved server-side, timeout_seconds is mandatory (1-600). It lacks an explicit "use ssh_run_command instead when you only need one command" exclusion, so the when-not side of the routing decision is left implicit.

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

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 8 tool updatesv0.1.0
    • First observedcli_help
    • First observedhost_create
    • First observedhost_delete
    • First observedhost_list
    • First observedhost_update
    • First observedssh_run_command
    • First observedssh_run_interactive
    • First observedssh_run_playbook

TDQS

A4.2/5.0

Scored across 8 tools

Disambiguation5/5

Each tool has a clearly distinct purpose: host CRUD tools operate on host records, while ssh_run_command, ssh_run_interactive, and ssh_run_playbook are separated by execution style (single command, expect-prompt interaction, multi-step playbook). cli_help is distinct as standalone CLI documentation. There is little risk of an agent confusing one tool for another.

Naming Consistency5/5

All tool names use consistent snake_case with a resource/action structure: host_* for host management, ssh_run_* for remote execution, and cli_help for CLI help. The prefixes cleanly group related operations. No mixed camelCase or inconsistent verb conventions are present.

Tool Count5/5

Eight tools are well-scoped for an SSH host management and command execution server. The host CRUD set is compact, and the three execution modes cover common remote operation needs without excessive surface area. Every tool appears to earn its place.

Completeness4/5

Host lifecycle coverage is strong with list, create, update, and delete, and execution covers non-interactive commands, interactive prompts, and playbooks. Minor gaps exist, such as no dedicated get-host details tool and no file transfer operations, but core workflows are covered.

Maintenance

ActivityMaintained
ResponsivenessNo issues

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