What is client-smoke?

A smoke-testing procedure for a locally built server using real clients: the Inspector command-line tool, its web interface, and an AI client. Smoke testing is a quick check that a change works in the main ways before deeper testing.

Use it to run scripted command-line checks, inspect the server manually in a web UI, try it with an AI client, and diagnose Inspector failures.

It provides a consistent way to exercise server tools, resources, and prompts and to investigate client or protocol-version problems.

How modelcontextprotocol/servers configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to modelcontextprotocol/servers. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/modelcontextprotocol/servers/main/.claude/skills/client-smoke/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/modelcontextprotocol/servers

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/modelcontextprotocol/servers/client-smoke/github.svg)](https://agentmods.dev/skills/modelcontextprotocol/servers/client-smoke)

Your own site

<a href="https://agentmods.dev/skills/modelcontextprotocol/servers/client-smoke"><img src="https://agentmods.dev/badge/skills/modelcontextprotocol/servers/client-smoke/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/modelcontextprotocol/servers/client-smoke"><img src="https://agentmods.dev/badge/skills/modelcontextprotocol/servers/client-smoke.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 85 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 4,974 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown No closer match found in the catalogue.

Token cost

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	$0.00085	$0.04974
Opus 5.5	$0.00034	$0.01990
Sonnet 5.5	$0.00017	$0.00995
Haiku 4.5	$0.00009	$0.00497

Measured 8d ago against content hash a388b0f8f2d3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

client-smoke scanned grade A 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 8d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s -m 2 -o /dev/null "$URL" && { echo "port 3917 is already in use" >&2; exit 1; }

.claude/skills/client-smoke/SKILL.md · 368 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

evals/evals.json 1014 B

Changes

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.

8d ago Changed · +94 lines · +1 tokens per session a388b0f8f2d3
18d ago Changed · +2 lines 9e524a731bcc
26d ago First seen · 272 lines · 84 tokens per session scan A 59101e339cbf

Subscribe to this mod's changes

client-smoke is a skill published in the GitHub repository modelcontextprotocol/servers (91,815 stars, last pushed yesterday), with no licence file. It adds 85 tokens to every session and 4,974 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-12.

Testing

client-smoke next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
client-smokemodelcontextprotocol/servers	Skill	92k	yesterday	none	A	85	Claude Code
research-engineerdavila7/claude-code-templates	Skill	33k	today	MIT	A	43	Claude Code, Codex
tika-eval-compareapache/tika	Skill	4.1k	yesterday	Apache-2.0	A	50	Claude Code, Codex
cua-driverdavidondrej/skills	Skill	4.3k	3d ago	MIT	A	68	Claude Code, Codex
jetson-validate-imageNVIDIA/skills	Skill	3.9k	yesterday	Apache-2.0	B	50	Claude Code, Codex
atmos-validationcloudposse/atmos	Skill	1.4k	today	Apache-2.0	A	31	Claude Code
tddcodewithmukesh/dotnet-claude-kit	Skill	805	2d ago	MIT	A	81	Claude Code

servers: Skill for Claude Code