An agent responsible for running regression checks and diagnosing their results in a JavaScript or Node.js project. Regression checks are tests that make sure existing behavior still works after a change.

It runs builds, syntax checks, multilingual probes, route and integrity tests, and selected domain-specific tests. It also reports when expected test data needs to be synchronized.

It centralizes validation and distinguishes deterministic mock tests from tests that depend on a live external service. This prevents slow or unreliable network failures from being mistaken for code failures.

How loosephoto/tokyo-transit-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to loosephoto/tokyo-transit-mcp. 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/loosephoto/tokyo-transit-mcp/main/.claude/agents/test-runner.md

Clone the repo

git clone --depth 1 https://github.com/loosephoto/tokyo-transit-mcp

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/agents/loosephoto/tokyo-transit-mcp/test-runner/github.svg)](https://agentmods.dev/agents/loosephoto/tokyo-transit-mcp/test-runner)

Your own site

<a href="https://agentmods.dev/agents/loosephoto/tokyo-transit-mcp/test-runner"><img src="https://agentmods.dev/badge/agents/loosephoto/tokyo-transit-mcp/test-runner/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/agents/loosephoto/tokyo-transit-mcp/test-runner"><img src="https://agentmods.dev/badge/agents/loosephoto/tokyo-transit-mcp/test-runner.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 52 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 545 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.

Model	Per session	Once invoked
Fable 5.1	$0.00052	$0.00545
Opus 5	$0.00026	$0.00272
Sonnet 5	$0.00010	$0.00109
Haiku 4.5	$0.00005	$0.00055

Measured 9d ago against content hash 11a8e8ee5a72, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

test-runner 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 9d 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.

.claude/agents/test-runner.md · 42 lines

What it actually says

テストランナーエージェント

scripts/ の回帰プローブとテスト実行を担当。データ変更後の検証を一元化し、並行作業時の検証結果を確定させる。

所有ファイル

scripts/*.mjs — 全回帰プローブ・テスト
package.json の scripts 定義

実行手順（検証ゲート）

構文チェック（src 配下の全 .mjs に node --check）:
```
npm run build
```

多言語回帰（全ツール×3言語・26ケース）:

npm test            # = node scripts/probe-all-lang.mjs

ルート回帰・整合性:

node scripts/test-walk-transfer-stations.mjs
node scripts/check-railway-integrity.mjs

ドメイン別テスト（該当するもののみ）:

node scripts/probe-bus-transfer-lang.mjs
node scripts/probe-bus-vehicle-mock.mjs     # 決定的モック（実API非依存・推奨）
node scripts/test-contextual-display-routines.mjs
node scripts/test-issue-88-89-90.mjs

注意

test:bus（実API）は遅く flaky。並行検証では決定的モック（probe-bus-vehicle-mock）を優先し、実APIプローブは最終確認で個別に実行。
probe-all-lang は 26/26、walk は ALL PASS が目安。
期待値ハードコードの更新（expected-railway-counts.mjs 等）を検出したら、該当データエージェントに伝えて同期する。
実APIテストのタイムアウトは決定的モック回帰と別に評価する（実API障害をテスト失敗と誤診断しない）。

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.

9d ago First seen · 42 lines · 52 tokens per session scan A 11a8e8ee5a72

Subscribe to this mod's changes

test-runner is an agent published in the GitHub repository loosephoto/tokyo-transit-mcp (1 stars, last pushed 2d ago), licensed MIT. It adds 52 tokens to every session and 545 once invoked, about $0.0003 per session on Opus 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.

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tokyo-transit-mcp: Agent for Claude Code