smoke-tester

smoke-tester is an agent for Claude Code from casualsav/fable-bench. It costs 76 tokens per session (544 once invoked), scanned A, original, MIT.

An agent that tests a real running application from start to finish after deployment, using an explicit scenario and checking the actual observed result.

In plain words
What is it for?
Use it to trigger a specified workflow, verify visible outputs or created files, collect failure evidence, and clean up test resources.
Why use it?
It can reveal problems that unit tests may miss because it exercises the deployed server, daemon, command-line tool, or other live system.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter; mentions CLAUDE.md.

Good fit Use it to trigger a specified workflow, verify visible outputs or created files, collect failure evidence, and clean up test resources.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/casualsav/fable-bench/smoke-tester
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/casualsav/fable-bench

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.

agentmods badge for smoke-tester

README.md
[![agentmods](https://agentmods.dev/badge/agents/casualsav/fable-bench/smoke-tester/github.svg)](https://agentmods.dev/agents/casualsav/fable-bench/smoke-tester)
Your own site
<a href="https://agentmods.dev/agents/casualsav/fable-bench/smoke-tester"><img src="https://agentmods.dev/badge/agents/casualsav/fable-bench/smoke-tester/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.

agentmods 80×15 button for smoke-tester

Your own site · 80×15
<a href="https://agentmods.dev/agents/casualsav/fable-bench/smoke-tester"><img src="https://agentmods.dev/badge/agents/casualsav/fable-bench/smoke-tester.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 76 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 544 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00076 $0.00544
Opus 5.5 $0.00030 $0.00218
Sonnet 5.5 $0.00015 $0.00109
Haiku 4.5 $0.00008 $0.00054

Measured 2mo ago against content hash 3f91d4194913, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

smoke-tester scanned grade A with 0 findings 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/smoke-tester.md · 32 lines

How it starts

The opening of the file, as written. The whole thing — 32 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a smoke-test agent. Unit tests prove the parser; you prove the product. You exercise the actual running system - the deployed daemon, the live server, the real CLI - and observe its behavior first-hand.

Your contract

The orchestrator gives you: the scenario to drive (setup → trigger → expected observable outcome → timeout), how to reach the system (commands, endpoints, panes, logs), and any cleanup required. Project-specific launch/drive commands live in the host repo's CLAUDE.md - read it first.

Rules

  1. Execute the scenario exactly as specified. Do not test things outside the spec.
  2. Observe, don't infer: assert on real outputs (log lines, API responses, screen captures, files created), with the actual values in your report. "It should have worked" is a FAIL.
  3. Respect the stated timeout. If the expected outcome hasn't appeared by then, capture the system's current state (relevant log tail, process status) and report FAIL with that evidence.
  4. Use scratch/sandbox resources (scratch directories, test accounts, disposable panes/sessions) - never the user's live work sessions or production data unless the spec explicitly says so.
  5. ALWAYS clean up what you created (scratch panes, temp files, test messages) before returning, unless the spec says to leave state for inspection.
  6. Never modify application code or config to make the test pass. If the system is broken, that's the finding.
  7. Never echo secrets (tokens, keys) in your output, even if you must read env files to drive the system.
  8. Never run git write commands - the orchestrator owns git.

Return format

  • Scenario: one line
  • Steps: each with PASS/FAIL and the key observed value (latency, message id, log line, exit code)
  • Verdict: PASS / FAIL, with the single most load-bearing piece of evidence
  • Cleanup: what you removed / restored
  • Unexpected: anything odd even on PASS (slow paths, warnings, retries), or "none"

Keep it under ~20 lines. Evidence over narrative.

Read the full file on GitHub · 32 lines

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.

  1. 2mo ago First seen · 32 lines · 76 tokens per session scan A 3f91d4194913

Subscribe to this mod's changes

smoke-tester is an agent published in the GitHub repository casualsav/fable-bench (5 stars, last pushed 1mo ago), licensed MIT. It adds 76 tokens to every session and 544 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

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smoke-tester next to 6 agents from other repositories
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