Wezterm Agent MCP Server
wezterm-agent-mcp
npm
v0.1.9
Published by multiagentcognition — no publish provenance, so origin is unverified, but the source is public: the repository link below is self-declared yet readable, so you can inspect the code before adopting it.
Wezterm MCP Server — programmable terminal control plane for multi-agent AI workflows
The grade answers one question — how safe is this server for you to adopt — so it is computed in two auditable stages. Nothing below is an opinion or an LLM's guess; every line is a real term the deterministic engine applied, and the same input always yields the same number.
1. Threat score — 100 − 10.6 = 89. What the published surface and source actually contain:
| Points | What was found | Category |
|---|---|---|
| −9.5 | Untrusted input concatenated into a command sink ×2 MTC-SRC-009 | injection |
| −1.2 | Package runs install-time scripts MTC-SUP-010 | supply-chain |
2. Client adoption risk — 89 − 7 = 82. Three small, subtract-only factors that reflect your risk in adopting it — a clean scan proves less on a powerful, unverified or barely-inspectable package, so the grade says so plainly:
| Points | Adoption-risk factor |
|---|---|
| −6 | capability blast radius (high) — client exposure if the model is manipulated |
| −1 | publisher verification (public source) — no provenance, but the source is public and inspectable |
Capability observations and info notes are shown under Findings but never scored.
Open any row's finding below for the file, line and evidence behind a deduction.
Findings 8
high Tool "wez_spawn" exposes command/code executionMTC-CAP-001
Tool "wez_spawn" appears to run shell commands or evaluate code (keyword "spawn" in tool name). Arbitrary execution driven by model input is one of the most dangerous MCP capabilities; combined with any untrusted input it becomes RCE.
Fix: Sandbox execution, allowlist commands/arguments, and never pass model output to a shell unescaped.
Location: tool wez_spawn
high Shell/command execution in server code (build/init.js)MTC-SRC-002
In the server's implementation (`build/init.js:1`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: { execSync } from 'node:child_process'; import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs'; im
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/init.js
high Shell/command execution in server code (build/platform.js)MTC-SRC-002
In the server's implementation (`build/platform.js:8`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: ecFileSync } from 'node:child_process'; import { existsSync } from 'node:fs'; import { homedir } from 'node:os'; import
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/platform.js
high Shell/command execution in server code (build/wez-mcp.js)MTC-SRC-002
In the server's implementation (`build/wez-mcp.js:8`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: nodeSpawn } from 'node:child_process'; import { existsSync, mkdirSync, readFileSync, readdirSync, renameSync, statSync,
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/wez-mcp.js
medium Untrusted input concatenated into a command sink (build/init.js)MTC-SRC-009
In the server's implementation (`build/init.js:50`): A shell/process command assembled from concatenated or interpolated values is command injection when any part is attacker-influenced — the OWASP canonical RCE flow. Verify what reaches the interpolated value. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: sswd return execSync(`eval echo ~${sudoUser}`, { encoding: 'utf8', timeout: 3000 }).trim(); }
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/init.js
medium Untrusted input concatenated into a command sink (build/platform.js)MTC-SRC-009
In the server's implementation (`build/platform.js:39`): A shell/process command assembled from concatenated or interpolated values is command injection when any part is attacker-influenced — the OWASP canonical RCE flow. Verify what reaches the interpolated value. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: const out = execSync(`pgrep -x ${name}`, { encoding: 'utf8', timeout: 3000 }); return out.trim()
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/platform.js
low Mutating tool "wez_spawn" declares no destructiveHintMTC-CAP-005
Tool "wez_spawn" can mutate/egress but declares no destructiveHint. Clients that don't default to spec-safe behavior may not prompt before running it.
Fix: Declare accurate annotations, and gate destructive tools on user confirmation regardless.
Location: tool wez_spawn
low Package runs install-time scripts (postinstall)MTC-SUP-010
"wezterm-agent-mcp" executes postinstall script(s) at install time. An install hook runs at install time; most are routine build/setup, but review what it does before trusting it.
Evidence: node build/postinstall.js
Fix: Review the scripts; install with --ignore-scripts where possible and vet what they do.
Location: package wezterm-agent-mcp
Tools 41
Each tool and what it can reach — statically extracted from the published source.
wez_spawnruns code / shellwez_clean_socketsno sensitive capabilitywez_focus_directionno sensitive capabilitywez_focus_paneno sensitive capabilitywez_focus_tabno sensitive capabilitywez_fullscreenno sensitive capabilitywez_get_textno sensitive capabilitywez_kill_allno sensitive capabilitywez_kill_guino sensitive capabilitywez_kill_muxno sensitive capability
Show 31 more tools ↓
wez_kill_paneno sensitive capabilitywez_kill_tabno sensitive capabilitywez_launch_agentsno sensitive capabilitywez_launch_gridno sensitive capabilitywez_launch_mixedno sensitive capabilitywez_listno sensitive capabilitywez_move_to_tabno sensitive capabilitywez_read_allno sensitive capabilitywez_read_all_deepno sensitive capabilitywez_read_tabno sensitive capabilitywez_reconcileno sensitive capabilitywez_rename_workspaceno sensitive capabilitywez_resize_paneno sensitive capabilitywez_restart_paneno sensitive capabilitywez_screenshotno sensitive capabilitywez_screenshot_all_tabsno sensitive capabilitywez_send_keyno sensitive capabilitywez_send_key_allno sensitive capabilitywez_send_textno sensitive capabilitywez_send_text_allno sensitive capabilitywez_send_text_submitno sensitive capabilitywez_send_text_submit_allno sensitive capabilitywez_send_text_submit_someno sensitive capabilitywez_session_recoverno sensitive capabilitywez_session_saveno sensitive capabilitywez_set_tab_titleno sensitive capabilitywez_set_window_titleno sensitive capabilitywez_splitno sensitive capabilitywez_startno sensitive capabilitywez_statusno sensitive capabilitywez_zoom_paneno sensitive capability
What this scan could not see
- Tools were statically extracted from the published source (41 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command "npx -y <package>".
Versions 1
Scan history per published version. The engine is deterministic — the same version always yields the same score, so a changed score means the package itself changed.
| Version | Score | Findings | Engine | Scanned |
|---|---|---|---|---|
v0.1.9 latest |
B 82/100 | 8 | 1.13.0 | 2026-09-07 |
Embed this score
Show this server's live Trust Score in your README, docs or website. The badge is served straight from the registry and updates automatically after every rescan — no API key needed. It links back to this page, so anyone who sees the grade can also read the findings behind it instead of taking a number on faith.
Verify this score yourself
The score above is reproducible: the same package version always yields the same result. Run it locally or over the free API — no account, no LLM, fully deterministic.
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