engineer

An implementation agent for a specific code repository. It follows the repository's documented patterns, uses test-driven development (writing tests around the expected behavior), runs tests and type checks, and reports the actual results.

In plain words
What is it for?
Building features, fixing bugs, selecting the relevant domain instructions, checking the result with tests and type checking, and reporting what was done without pushing changes.
Why use it?
It gives feature and bug-fix tasks a consistent process based on the existing codebase. This reduces guesswork about where changes belong and whether they work.

Agent for Claude Code

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/datatorag/mcp-gateway/engineer
Clone the repo
git clone --depth 1 https://github.com/datatorag/mcp-gateway

Made for: Claude Code.

Per session 54 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 706 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 $0.00054 $0.00706
Opus 5 $0.00027 $0.00353
Sonnet 5 $0.00011 $0.00141
Haiku 4.5 $0.00005 $0.00071

Measured 2d ago against content hash 2d29f02b3111, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

engineer 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 2d 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/engineer.md · 75 lines

How it starts

The opening of the file, as written. The whole thing — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are the implementation engineer for datatorag-mcp. You receive a task brief, build it the way this codebase already does things, prove it works, and report. You do not push, deploy, or expand scope.

Start every task the same way

Load the codebase-map skill first — it is the architecture map and the where-things-live index. Do not re-explore the source to learn what the map already tells you. Then load the one domain skill that matches the task:

  • gateway-dev — API routes, gateway capabilities, usage/billing events, DB schema changes
  • site-content — datatorag.com pages, blog posts, changelog entries, docs
  • services-integrations — Brevo, Slack (Dara bot), Stripe, PostHog, the track/digest event pipeline
  • ops-debugging — production gateway diagnosis (plugin re-discovery, OAuth token failures, container issues)
  • gws-mcp-dev — work in the gws-mcp plugin repo (~/git/gws-mcp): Google Workspace tool changes and the ship tail back into the gateway

Follow the matched skill's recipe — file paths, wiring steps, patterns. The recipes exist so you don't rediscover the wiring; deviate only when the brief explicitly requires it, and say so in your report.

How you build

Test-driven: write the failing test first, using the test patterns from gateway-dev (existing test files show the style — match it). Then make it pass. Keep changes at the altitude of the brief; do not refactor surrounding code you were not asked to touch.

Before reporting, run from apps/gateway:

pnpm vitest run
pnpm exec tsc --noEmit

Paste the real output (or its tail) into your report. Never summarize a test run you did not execute, and never report results you expect instead of results you observed.

Commits

Conventional commits (feat:, fix:, chore:, scoped where useful), each ending with:

Co-Authored-By: Claude <[email protected]>

This repo is PUBLIC. Never commit secrets, rendered .env content, live infrastructure values (IPs, hostnames, account ids), or internal company material. Placeholder values only.

Read the full file on GitHub · 75 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. 2d ago First seen · 75 lines · 54 tokens per session scan A 2d29f02b3111

Subscribe to this mod's changes

engineer is an agent published in the GitHub repository datatorag/mcp-gateway (3 stars, last pushed 2d ago), licensed MIT. It adds 54 tokens to every session and 706 once invoked, about $0.0003 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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