backend-worker

backend-worker is a skill for Claude Code, Codex from Phudit-2547/ChuMaiNichi. It costs 15 tokens per session (382 once invoked), scanned A, original, MIT.

Instructions for a worker that writes Python backend code, database queries, and utility scripts. It uses test-driven development, meaning tests are written first to describe the expected behavior.

In plain words
What is it for?
Use it to add or change Python data processing, database imports, queries, and backend utilities, then run the project's test suite.
Why use it?
It gives backend work a repeatable process and catches mistakes before code is considered finished. It also requires checking that the project's tests pass.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to add or change Python data processing, database imports, queries, and backend utilities, then run the project's test suite.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/phudit-2547/chumainichi/backend-worker
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.

Any agent
npx skills add Phudit-2547/ChuMaiNichi --skill backend-worker
Clone the repo
git clone --depth 1 https://github.com/Phudit-2547/ChuMaiNichi

Made for: Claude Code, Codex.

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-worker

README.md
[![agentmods](https://agentmods.dev/badge/skills/phudit-2547/chumainichi/backend-worker/github.svg)](https://agentmods.dev/skills/phudit-2547/chumainichi/backend-worker)
Your own site
<a href="https://agentmods.dev/skills/phudit-2547/chumainichi/backend-worker"><img src="https://agentmods.dev/badge/skills/phudit-2547/chumainichi/backend-worker/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-worker

Your own site · 80×15
<a href="https://agentmods.dev/skills/phudit-2547/chumainichi/backend-worker"><img src="https://agentmods.dev/badge/skills/phudit-2547/chumainichi/backend-worker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 15 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 382 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 $0.00015 $0.00382
Opus 5 $0.00008 $0.00191
Sonnet 5 $0.00003 $0.00076
Haiku 4.5 $0.00002 $0.00038

Measured 8d ago against content hash c01efba9038a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

backend-worker 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 8d 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.

.factory/skills/backend-worker/SKILL.md · 53 lines

What it actually says

Backend Worker

NOTE: Startup and cleanup are handled by worker-base. This skill defines the WORK PROCEDURE.

When to Use This Skill

Use this skill for implementing python backend logic, writing queries, and developing utility scripts.

Required Skills

None

Work Procedure

  1. Create/Update tests first (e.g., test_import_user_data.py). Ensure they fail.
  2. Implement the missing logic (e.g., import_user_data.py).
  3. Ensure the code respects .factory/services.yaml commands (test).
  4. Run uv run pytest to ensure tests pass.
  5. Manually verify the behavior if applicable.

Example Handoff

{ "salientSummary": "Implemented import_user_data.py and added unit tests covering valid parsing, upsert logic, and pruning older snapshots. All 5 tests pass.", "whatWasImplemented": "Created import_user_data.py which reads JSON, uses asyncpg to connect to DB, inserts records, and prunes old records keeping only latest 5.", "whatWasLeftUndone": "", "verification": { "commandsRun": [ { "command": "uv run pytest scraper/tests/", "exitCode": 0, "observation": "5 passed" } ], "interactiveChecks": [] }, "tests": { "added": [ { "file": "scraper/tests/test_import_user_data.py", "cases": [ { "name": "test_import", "verifies": "Imports JSON successfully" } ] } ] }, "discoveredIssues": [] }

When to Return to Orchestrator

  • Required DB tables or structure is ambiguous.
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. 8d ago First seen · 53 lines · 15 tokens per session scan A c01efba9038a

Subscribe to this mod's changes

backend-worker is a skill published in the GitHub repository Phudit-2547/ChuMaiNichi (2 stars, last pushed 6d ago), licensed MIT. It adds 15 tokens to every session and 382 once invoked, about $0.0001 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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