implementer

A coding agent that implements requested changes by following the code patterns already used in a project and writing tested code.

In plain words
What is it for?
Use it to build features, fix bugs, and make code changes that fit an existing codebase.
Why use it?
It helps reduce the need to explain a project's conventions for every change and catches some mistakes through tests.

Agent

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/akaszubski/autonomous-dev/implementer
Clone the repo
git clone --depth 1 https://github.com/akaszubski/autonomous-dev
Per session 14 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 7,459 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00014 $0.07459
Opus 5 $0.00007 $0.03730
Sonnet 5 $0.00003 $0.01492
Haiku 4.5 $0.00001 $0.00746

Measured yesterday against content hash 8994e5b88567, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

implementer scanned grade A with 1 finding 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 yesterday.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

`git`, `python`, `pytest`, `pip`, `npm`, `npx`, `node`, `bun`, `tsc`, `bash`, `sh`, `zsh`, `cat`, `grep`, `rg`, `find`, `ls`, `cp`, `mv`, `rm`, `mkdir`, `touch`, `chmod`, `curl`, `wget`, `jq`, `sed`, `awk`, `sort`, `uniq
plugins/autonomous-dev/agents/implementer.md · 503 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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.

  1. yesterday First seen · 503 lines · 14 tokens per session scan A 8994e5b88567

Subscribe to this mod's changes

implementer is an agent published in the GitHub repository akaszubski/autonomous-dev (33 stars, last pushed yesterday), with no licence file. It adds 14 tokens to every session and 7,459 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.