Borrowing it
Nothing to install: this file belongs to bearlike/Assistant. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/bearlike/Assistant/master/.claude/skills/mewbo-cli-smoketest/SKILL.mdgit clone --depth 1 https://github.com/bearlike/AssistantWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/bearlike/assistant/mewbo-cli-smoketest)<a href="https://agentmods.dev/skills/bearlike/assistant/mewbo-cli-smoketest"><img src="https://agentmods.dev/badge/skills/bearlike/assistant/mewbo-cli-smoketest/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/bearlike/assistant/mewbo-cli-smoketest"><img src="https://agentmods.dev/badge/skills/bearlike/assistant/mewbo-cli-smoketest.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 5 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Agent Snooping · line 241 Skill accesses MCP server configuration files (mcp.json). MCP configs contain server URLs, authentication tokens, and tool definitions — reading them allows the skill to discover and potentially abuse other tool integrations.Fix: Remove all code or instructions that read MCP configuration files (mcp.json). MCP server details should be managed by the agent runtime, not read by individual skills.
- medium Excessive Agency · line 23 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
- medium Excessive Agency · line 38 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
- medium Excessive Agency · line 23 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
- medium Excessive Agency · line 38 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00111 | $0.04297 |
| Opus 5.5 | $0.00044 | $0.01719 |
| Sonnet 5.5 | $0.00022 | $0.00859 |
| Haiku 4.5 | $0.00011 | $0.00430 |
Grade B, and why
mewbo-cli-smoketest scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Reads MCP configurationmediumAgent snooping
mcp.json carries server URLs and auth tokens; reading it lets a mod discover and abuse other integrations.
- **Env var expansion.** CWD `.mcp.json` may use `${VAR}`; if unset in the launching shell, tokens stay literal and MCP calls fail silently. How it starts
The opening of the file, as written. The whole thing — 243 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mewbo CLI Smoke Test via Tmux
Automate end-to-end CLI testing by running mewbo inside a tmux pane, driving it with commands/queries, and analyzing both the rendered TUI frame and the verbose log for errors, warnings, and regressions.
Why tmux
The CLI is one full-screen Textual App, with live streaming + a per-agent fleet sidebar layered on top. You cannot run it via the Bash tool because it requires a PTY and renders interactive widgets on the alternate screen. Tmux gives you a real terminal to drive the app while capturing output programmatically.
Two capture channels (read this first)
A Textual app paints the alternate screen, so the two things you want to observe come from two different places:
- The rendered TUI frame —
tmux capture-pane -preturns the current visible frame only. The alt-screen keeps no scrollback, so-S -100does not give you history the way it does for a plain shell; it just returns the visible grid. To inspect what scrolled past, drive the app to re-render (e.g. scroll the transcript) or rely on the log channel below. - The verbose log — route logs to a file so they don't corrupt the TUI, then
grepthe file. Do not use--log-consolewith the TUI (it paints over the widgets). Launch with:
tmux send-keys -t <session>:mewbo-test \
"mewbo -vv --auto-approve --log-file /tmp/mewbo-test.log --log-overwrite" Enter
Then, after each step: tmux capture-pane -p -t <session>:mewbo-test for the frame, and grep -nE 'WARNING|ERROR|Traceback|Failed to' /tmp/mewbo-test.log for diagnostics. The two are complementary — a clean frame can still hide a logged reconnect error, and a busy log can accompany a correctly-rendered frame.
Use the installed
mewbo(fromuv tool install .) oruv run mewbofrom the repo root. The installed binary tests what the user actually runs.
Setup
tmux list-sessions
tmux new-window -t <session>:<next> -n mewbo-test
# width matters: the sidebar/fleet only render legibly with enough columns
tmux resize-window -t <session>:mewbo-test -x 200 -y 50 2>/dev/null || true
tmux send-keys -t <session>:mewbo-test \
"mewbo -vv --auto-approve --log-file /tmp/mewbo-test.log --log-overwrite" Enter
sleep 10 && tmux capture-pane -p -t <session>:mewbo-test
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2mo ago First seen · 243 lines · 111 tokens per session scan B 598351e47c62
mewbo-cli-smoketest is a skill published in the GitHub repository bearlike/Assistant (44 stars, last pushed 3d ago), licensed MIT. It adds 111 tokens to every session and 4,297 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads mcp configuration). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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