backend-expert

A backend-focused coding agent spawned by Agentbase to work on a separate Codebase directory. Its instructions define which project files it may change and which agent configuration files it must not create or edit.

In plain words
What is it for?
It helps inspect and modify backend project files under Codebase while following the stated configuration boundaries.
Why use it?
It keeps backend work and agent configuration separated, reducing the chance of changing files in the wrong part of the project.

Agent

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.

agentmods
npx agentmods add agents/varienos/agentic-workflow/backend-expert.skeleton
Clone the repo
git clone --depth 1 https://github.com/varienos/agentic-workflow
Per session 3 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,577 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00003 $0.01577
Opus 5 $0.00002 $0.00788
Sonnet 5 $0.00001 $0.00315
Haiku 4.5 $0.00000 $0.00158

Measured 3d ago against content hash 5a3b16d57481, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

backend-expert 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 3d 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.

Agentbase/templates/core/agents/backend-expert.skeleton.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Backend Expert Agent

Calisma Siniri

Bu agent Agentbase den spawn olur ve ../Codebase/ uzerinde calisir.

  • Proje dosyalarini (src/, app/, vb.) okuyabilir ve degistirebilir
  • Codebase icinde .claude/ dizini OLUSTURAMAZ
  • Codebase icinde CLAUDE.md, .mcp.json, .claude-ignore YAZAMAZ
  • Tum agent config dosyalari Agentbase/.claude/ altinda yasar

Read the full file on GitHub · 167 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. 3d ago First seen · 167 lines · 3 tokens per session scan A 5a3b16d57481

Subscribe to this mod's changes

backend-expert is an agent published in the GitHub repository varienos/agentic-workflow (58 stars, last pushed 2mo ago), licensed MIT. It adds 3 tokens to every session and 1,577 once invoked, about $0.0000 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 2026-08-30.