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code-implementer

code-implementer is a skill for Claude Code, Codex from jggomez/expert-ai-developer-skills. It costs 40 tokens per session (909 once invoked), scanned A, original, Apache-2.0.

Guides the implementation of code using Test-Driven Development (TDD) and clean code principles. Trigger when implementing new features, fixing bugs, or refactoring existing code.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions subagents; mentions Claude Code.

not rated 30repo yesterday A scan 40 tokens original Apache-2.0
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Install with agentmods
npx agentmods add skills/jggomez/expert-ai-developer-skills/code-implementer
View source ↗ jggomez/expert-ai-developer-skills
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 jggomez/expert-ai-developer-skills --skill code-implementer
Clone the repo
git clone --depth 1 https://github.com/jggomez/expert-ai-developer-skills

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 code-implementer

README.md
[![agentmods](https://agentmods.dev/badge/skills/jggomez/expert-ai-developer-skills/code-implementer/github.svg)](https://agentmods.dev/skills/jggomez/expert-ai-developer-skills/code-implementer)
Your own site
<a href="https://agentmods.dev/skills/jggomez/expert-ai-developer-skills/code-implementer"><img src="https://agentmods.dev/badge/skills/jggomez/expert-ai-developer-skills/code-implementer/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 code-implementer

Your own site · 80×15
<a href="https://agentmods.dev/skills/jggomez/expert-ai-developer-skills/code-implementer"><img src="https://agentmods.dev/badge/skills/jggomez/expert-ai-developer-skills/code-implementer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 909 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 $0.00040 $0.00909
Opus 5.5 $0.00016 $0.00364
Sonnet 5.5 $0.00008 $0.00182
Haiku 4.5 $0.00004 $0.00091

Measured today against content hash 2682cede2acd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

code-implementer 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 today.

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.

plugins/antigravity/python-backend/skills/code-implementer/SKILL.md · 66 lines

How it starts

The opening of the file, as written. The whole thing — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Implementer Skill

Overview

This skill guides the implementation of production-grade code adhering to Test-Driven Development (TDD), SOLID, DRY, and KISS principles. It acts as a Senior Code Implementer that translates architectural designs, interfaces, and product requirements into clean, well-tested, and maintainable software.

When to Use

Trigger Scenarios

  • Writing new production code, API endpoints, algorithms, or services.
  • Fixing identified bugs, security vulnerabilities, or regression defects.
  • Executing code refactorings while preserving external behavior and contracts.
  • Implementing features following architectural blueprints or design specifications.

When NOT to Use

  • High-level system design & ADR authoring: Route to senior-architect-engineering or design-spec-expert.
  • Requirements definition & PRD generation: Route to product-analyst.
  • E2E & user-journey test suites: Route to qa-tester.
  • Final release compliance & security sign-off: Route to compliance-verifier.

Process

Phase 1: Context & Contract Ingestion

  1. Read docs/<feature-name>/spec.md (## Product / ## Architecture), ADRs, or surrounding codebase contracts before writing code. For an isolated fix, inspect the target module and its existing unit tests.
  2. Confirm system boundaries, schema types, and error handling policies.

Phase 2: Test-Driven Development (TDD) Cycle

Enforce the strict Red-Green-Refactor loop:

  1. Red: Write a failing unit or component test asserting the target behavior, matching AAA (Arrange-Act-Assert) pattern. Run the test to confirm failure for the expected reason.
  2. Green: Write the minimal amount of production code needed to satisfy the test assertions. Avoid speculative generalizations or gold-plating.
  3. Refactor: Clean up the implementation: eliminate duplication, improve variable naming, extract helper functions, and optimize performance while keeping all tests 100% green.

Phase 3: Validation & Quality Gate

  1. Execute the local unit test suite to verify 100% pass rate.
  2. Run language formatters and linters (e.g., black, ruff, eslint, dart format).
  3. Ensure no compiler or static analysis warnings remain.

Read the full file on GitHub · 66 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. today First seen · 66 lines · 40 tokens per session scan A 2682cede2acd

Subscribe to this mod's changes

code-implementer is a skill published in the GitHub repository jggomez/expert-ai-developer-skills (30 stars, last pushed yesterday), licensed Apache-2.0. It adds 40 tokens to every session and 909 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 2026-11-06.

Backend and APIsDebuggingTesting
Related

code-implementer compared with skills from other repositories

code-implementer next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
code-implementerjggomez/expert-ai-developer-skillsSkill30yesterdayApache-2.0A40Claude Code, Codex
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printing-press-amendmvanhorn/cli-printing-pressSkill4.9kyesterdayMITA222Claude Code
convex-performance-auditopenclaw/clawhubSkill9.5kyesterdayMITA38Codex
convex-insightsopenclaw/clawhubSkill9.5kyesterdayMITA45Claude Code, Codex
axiom-networkingCharlesWiltgen/AxiomSkill1.3kyesterdayMITA37Claude Code
platform-apex-anonymous-runforcedotcom/sf-skillsSkill1.1k2d agoApache-2.0A119Claude Code