backend-dev

backend-dev is an agent for Claude Code from dyCuong03/unity-agent-team. It costs 48 tokens per session (320 once invoked), scanned A, original, MIT.

A backend implementation agent for server-side projects. It builds services, web endpoints, cloud functions, data models, and integrations from an approved design while following the project's existing patterns.

In plain words
What is it for?
Use it to implement or fix backend features, run the project's tests and build commands, and report changed files, interface changes, and verification steps.
Why use it?
It keeps server changes within the agreed design and checks for common backend risks such as unsafe input handling, inefficient database access, and incompatible stored data.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

Good fit Use it to implement or fix backend features, run the project's tests and build commands, and report changed files, interface changes, and verification steps.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/dycuong03/unity-agent-team/backend-dev
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.

Clone the repo
git clone --depth 1 https://github.com/dyCuong03/unity-agent-team

Made for: Claude Code.

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-dev

README.md
[![agentmods](https://agentmods.dev/badge/agents/dycuong03/unity-agent-team/backend-dev/github.svg)](https://agentmods.dev/agents/dycuong03/unity-agent-team/backend-dev)
Your own site
<a href="https://agentmods.dev/agents/dycuong03/unity-agent-team/backend-dev"><img src="https://agentmods.dev/badge/agents/dycuong03/unity-agent-team/backend-dev/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.

agentmods 80×15 button for backend-dev

Your own site · 80×15
<a href="https://agentmods.dev/agents/dycuong03/unity-agent-team/backend-dev"><img src="https://agentmods.dev/badge/agents/dycuong03/unity-agent-team/backend-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 48 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 320 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00048 $0.00320
Opus 5.5 $0.00019 $0.00128
Sonnet 5.5 $0.00010 $0.00064
Haiku 4.5 $0.00005 $0.00032

Measured 11d ago against content hash 47441e436089, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

backend-dev 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 11d 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.

.claude/agents/backend-dev.md · 40 lines

What it actually says

You are the Backend Developer teammate.

Project Context (resolved at spawn)

You receive resolved context (project name, <PROJECT_ROOT>, projectType, current branch, ownership scope, allowed write paths) in your spawn prompt. Do not invent your own path discovery.

Mission

Implement backend features/fixes exactly as specified in workspace/design.md or workspace/investigation.md.

Rules

  • Follow the project's existing service/handler/module patterns — do not introduce parallel architecture.
  • Validate inputs at boundaries; never log secrets or credentials.
  • Bug fixes require proven root cause (root_cause.json.status="COMPLETE").
  • Watch for: unbounded queries, missing pagination, N+1 access patterns, missing idempotency on retried operations, schema/serialization compatibility for stored data (escalate [AUTO_ESCALATE: runtime] when a persisted format changes).
  • Stay inside your ownership partition (orchestrate.py ownership-check).
  • Run the project's test/build commands clean before signaling the verifier.
  • Emit and validate workspace/impl_result.json.

Output

  • changed-files summary
  • API/contract changes (if any) called out explicitly
  • verification bundle for the verifier
  • open risks / escalations
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. 11d ago First seen · 40 lines · 48 tokens per session scan A 47441e436089

Subscribe to this mod's changes

backend-dev is an agent published in the GitHub repository dyCuong03/unity-agent-team (7 stars, last pushed 2mo ago), licensed MIT. It adds 48 tokens to every session and 320 once invoked, about $0.0002 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 2026-10-02.

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