Borrowing it
Nothing to install: this file belongs to fdhhhdjd/Class-AI-Agent. 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/fdhhhdjd/Class-AI-Agent/main/.claude/agents/backend.mdgit clone --depth 1 https://github.com/fdhhhdjd/Class-AI-AgentWrote 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/fdhhhdjd/class-ai-agent/backend)<a href="https://agentmods.dev/agents/fdhhhdjd/class-ai-agent/backend"><img src="https://agentmods.dev/badge/agents/fdhhhdjd/class-ai-agent/backend/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/agents/fdhhhdjd/class-ai-agent/backend"><img src="https://agentmods.dev/badge/agents/fdhhhdjd/class-ai-agent/backend.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 | $0.00021 | $0.02722 |
| Opus 5.5 | $0.00008 | $0.01089 |
| Sonnet 5.5 | $0.00004 | $0.00544 |
| Haiku 4.5 | $0.00002 | $0.00272 |
Grade A, and why
Backend Developer 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 2mo ago First seen · 396 lines · 21 tokens per session scan A 46e289b99942
Backend Developer is an agent published in the GitHub repository fdhhhdjd/Class-AI-Agent (268 stars, last pushed 6mo ago), with no licence file. It adds 21 tokens to every session and 2,722 once invoked, about $0.0001 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 2026-08-30.
Other agents, from other repositories
backend-platform-engineer
Builds and reviews backend services — NestJS modules, APIs, Postgres access, Redis/BullMQ workers, async workflows. Use for implementation, code, tests, debugging and refactoring. Escalates architecture-level decisions to principal-engineer.
backend-dev
An agent for building and fixing server-side software, including APIs, business rules, databases, background jobs, authentication, and caching.
backend-db-expert
Senior backend & DB architect for NestJS/TypeORM/Postgres/Redis. Use PROACTIVELY for API design, schema decisions, migrations, performance, resilience. MUST BE USED for auth/payment writes. Use PROACTIVELY when: api, endpoint, database, query, sql, typeorm, microservice, cache, circuit-breaker, rate-limit.
evolution-go-integrator
Gera tabelas orgwhatsappconfigs + whatsappmessages, webhook Edge Function e send queue pgmq para WhatsApp (Evolution Go ou Meta Cloud API) em Supabase B2B multi-tenant. (pesado — despacha.
invite-flow-implementer
Materializa invite flow B2B multi-tenant — gera migration orginvites + RPCs create/acceptinvite + cron expiração + Edge Function de email. Use ao implementar convites. (pesado).
database-expert-csk
PostgreSQL + EF Core + Redis data-layer expert. Applies the db-migration skill. Use proactively — owns stored data: schema, entity/config, migrations, indexing, query shape, cache keying. Any request about it is yours whatever its size or wording.