Borrowing it
Nothing to install: this file belongs to tokusumi/wassden-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.
curl -O https://raw.githubusercontent.com/tokusumi/wassden-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/tokusumi/wassden-mcpWrote 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/instructions/tokusumi/wassden-mcp/claude-md)<a href="https://agentmods.dev/instructions/tokusumi/wassden-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/tokusumi/wassden-mcp/claude-md/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/instructions/tokusumi/wassden-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/tokusumi/wassden-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.02811 | $0.02811 |
| Opus 5 | $0.01406 | $0.01406 |
| Sonnet 5 | $0.00562 | $0.00562 |
| Haiku 4.5 | $0.00281 | $0.00281 |
Grade B, and why
wassden-mcp CLAUDE.md 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 10d 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.
Strips warnings and disclaimersmediumAnti-refusal
Omitting safety caveats hides risk from the user and is a common jailbreak preamble.
- All code must pass linting without warnings (ruff with extensive rule set) How it starts
The opening of the file, as written. The whole thing — 216 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Claude Code Instructions
Linter and Test Policy
- NEVER ignore linter errors - All linting issues must be fixed
- NEVER ignore test failures - All tests must pass
- NEVER disable or skip linter rules without explicit user approval
- NEVER disable or skip tests without explicit user approval
- Always run
make checkafter code changes - If linter/test commands fail, the task is NOT complete
Commands
Development Commands
- All checks:
make check- Runs format, lint, typecheck, test, and CLI verification for dev mode - CI dev mode:
make ci- Runs all checks for dev mode in CI (format --check, with dev dependencies) - CI core mode:
make ci-core- Runs checks for core functionality only (no dev dependencies) - Format code:
make format- Format code with ruff - Lint code:
make lint- Lint code with ruff check - Type check:
make typecheck- Type check with mypy - Run all tests:
make test- Run all tests with coverage using pytest - Run core tests:
make test-core- Run core tests only (excludes dev-marked tests) - Run dev tests:
make test-dev- Run dev tests only (requires dev dependencies) - Run AST tests:
make test-ast- Run AST validation tests only (172 tests) - Validate examples:
make validate-examples- Run integration tests for spec examples in both Japanese and English - Help:
make help- Show all available make commands
CLI Testing Commands
- Local CLI:
uv run wassden --help- Show available CLI commands - Test functionality:
uv run wassden prompt-requirements --userInput "test"- Test CLI functionality - Start MCP server:
uv run wassden start-mcp-server --transport stdio- Start MCP server locally
Multi-Language Support Commands
- Japanese mode: Add
--language jato any command for Japanese output - English mode: Add
--language ento any command for English output - Auto-detection: Omit
--languageto let the system automatically detect language - Examples:
uv run wassden prompt-requirements --userInput "test" --language en- Force Englishuv run wassden prompt-requirements --userInput "テストプロジェクト"- Auto-detects Japaneseuv run wassden validate-requirements --requirementsPath specs/requirements.md- Detects from file content
- MCP Server: All MCP tools automatically detect language from content without parameters
- Default Fallback: Defaults to Japanese (
ja) when detection is uncertain
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.
- 10d ago First seen · 216 lines · 2,811 tokens per session scan B b2df8ff2e9d5
wassden-mcp CLAUDE.md is an instructions file published in the GitHub repository tokusumi/wassden-mcp (1 stars, last pushed 9mo ago), licensed MIT. It adds 2,811 tokens to every session, about $0.0141 per session on Opus 5. A static security scan graded it B with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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