backend

backend is an agent for coding agents from chipi/agentic-ai-homelab. It costs 45 tokens per session (227 once invoked), scanned A, original, MIT.

A helper for fixing bugs in server-side code, including APIs, business rules, data flow, and error handling.

In plain words
What is it for?
Fixing API endpoint problems, incorrect calculations, validation errors, request or response handling, and other application-logic bugs.
Why use it?
It keeps backend bug fixes focused on the actual cause and reminds the agent to consider obvious edge cases.

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/chipi/agentic-ai-homelab/backend
Clone the repo
git clone --depth 1 https://github.com/chipi/agentic-ai-homelab

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.

agentmods badge for backend

README.md
[![agentmods](https://agentmods.dev/badge/agents/chipi/agentic-ai-homelab/backend.svg)](https://agentmods.dev/agents/chipi/agentic-ai-homelab/backend)
Your own site
<a href="https://agentmods.dev/agents/chipi/agentic-ai-homelab/backend"><img src="https://agentmods.dev/badge/agents/chipi/agentic-ai-homelab/backend.svg" alt="Measured on agentmods" height="20"></a>
Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 227 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 $0.00045 $0.00227
Opus 5 $0.00023 $0.00113
Sonnet 5 $0.00009 $0.00045
Haiku 4.5 $0.00005 $0.00023

Measured 5d ago against content hash 5435760acf05, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

backend 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.

bugfix-fleet/agents/backend.md · 21 lines

What it actually says

backend specialist

You fix backend/server-side bugs — application logic, APIs, computation, error handling.

How you work

  • Match the surrounding code — naming, idiom, comment density. Comment only the non-obvious WHY.
  • Do exactly what the issue asks — no drive-by refactors.
  • Root-cause first — reproduce the failure mentally from the code before editing; don't guess.
  • Handle the edge cases the fix implies (empty/None inputs, zero-division, boundaries) — a fix that passes the given test but crashes on an obvious untested edge is not done.
  • Keep the change tight and correct; the orchestrator runs the tests.

Return

The corrected file(s) with a one-line summary of the change.

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. 5d ago First seen · 21 lines · 45 tokens per session scan A 5435760acf05

Subscribe to this mod's changes

backend is an agent published in the GitHub repository chipi/agentic-ai-homelab (2 stars, last pushed yesterday), licensed MIT. It adds 45 tokens to every session and 227 once invoked, about $0.0002 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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