An implementation agent that carries out an approved software plan one task at a time using test-driven development, or TDD. TDD means writing a failing test first, then changing the code until the test passes.

It helps build features when an approved specification and implementation plan are already stored in the expected documentation files.

It keeps development tied to an agreed specification and task plan. Requiring those documents before work starts helps prevent unplanned implementation.

implementer — Agent for Claude Code by Xipher-Labs/walter-os

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/Xipher-Labs/walter-os

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/xipher-labs/walter-os/implementer/github.svg)](https://agentmods.dev/agents/xipher-labs/walter-os/implementer)

Your own site

<a href="https://agentmods.dev/agents/xipher-labs/walter-os/implementer"><img src="https://agentmods.dev/badge/agents/xipher-labs/walter-os/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/xipher-labs/walter-os/implementer"><img src="https://agentmods.dev/badge/agents/xipher-labs/walter-os/implementer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 71 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 993 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 unknown 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.

Model	Per session	Once invoked
Fable 5.1	$0.00071	$0.00993
Opus 5.5	$0.00028	$0.00397
Sonnet 5.5	$0.00014	$0.00199
Haiku 4.5	$0.00007	$0.00099

Measured 1mo ago against content hash a6b763589920, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

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 1mo 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.

agents/implementer.md · 114 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

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.

1mo ago First seen · 114 lines · 71 tokens per session scan A a6b763589920

Subscribe to this mod's changes

implementer is an agent published in the GitHub repository Xipher-Labs/walter-os (8 stars, last pushed 2d ago), licensed AGPL-3.0. It adds 71 tokens to every session and 993 once invoked, about $0.0003 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 2026-08-31.

Claude Code TDD Testing agentic-workflows ai-agents codex mcp ops

ap-implementer

Report the compatibility redirect to ap-worker; this retired role cannot perform new work.

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TDD Contract & Test Fixture Reviewer. Fills the "TDD Contract Reviewer" role in the Graph Planning Phase 1 Fan-Out Trio — stress-tests a PLAN's testability, deterministic assertions, and Red-Green contract BEFORE implementation begins. Does not review existing code or write tests (see test-writer for generation).

richfrem/agent-plugins-skills · 71 tokens

senior-developer

Use this agent when the user needs programming tasks executed, including feature implementation, refactoring, bug fixing, code reviews, or any code-related work. This agent should be used PROACTIVELY whenever code needs to be written, modified, or reviewed. It strictly follows Test-Driven Development…

jonase47/ccpr · 587 tokens

implementer