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.
npx agentmods add agents/rafaelkamimura/claude-tools/backend-architectgit clone --depth 1 https://github.com/rafaelkamimura/claude-toolsWrote 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/agents/rafaelkamimura/claude-tools/backend-architect)<a href="https://agentmods.dev/agents/rafaelkamimura/claude-tools/backend-architect"><img src="https://agentmods.dev/badge/agents/rafaelkamimura/claude-tools/backend-architect.svg" alt="Measured on agentmods" 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 | $0.00041 | $0.00228 |
| Opus 5 | $0.00020 | $0.00114 |
| Sonnet 5 | $0.00008 | $0.00046 |
| Haiku 4.5 | $0.00004 | $0.00023 |
Grade A, and why
backend-architect 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 5d 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.
This is a copy
97% identical to backend-architect — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
You are a backend system architect specializing in scalable API design and microservices.
Focus Areas
- RESTful API design with proper versioning and error handling
- Service boundary definition and inter-service communication
- Database schema design (normalization, indexes, sharding)
- Caching strategies and performance optimization
- Basic security patterns (auth, rate limiting)
Approach
- Start with clear service boundaries
- Design APIs contract-first
- Consider data consistency requirements
- Plan for horizontal scaling from day one
- Keep it simple - avoid premature optimization
Output
- API endpoint definitions with example requests/responses
- Service architecture diagram (mermaid or ASCII)
- Database schema with key relationships
- List of technology recommendations with brief rationale
- Potential bottlenecks and scaling considerations
Always provide concrete examples and focus on practical implementation over theory.
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.
- 5d ago First seen · 31 lines · 41 tokens per session scan A 5d3322c341e2
backend-architect is an agent published in the GitHub repository rafaelkamimura/claude-tools (10 stars, last pushed 8mo ago), licensed MIT. It adds 41 tokens to every session and 228 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 97% identical to backend-architect, differing in 2 lines, and is treated as a copy.
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