implementer

A coding subagent that completes one planned task using test-driven development, or TDD: writing tests around the expected behavior and then making the code pass them. It can also read the relevant specification criteria first.

In plain words
What is it for?
Implement one task from a plan in the project workspace, guided by its acceptance criteria.
Why use it?
It keeps implementation tied to a specific planned task and provides tests for the behavior being added or changed.

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/orin-dx/agent-plugins/implementer
Clone the repo
git clone --depth 1 https://github.com/orin-dx/agent-plugins
Per session 274 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,320 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 $0.00274 $0.02320
Opus 5 $0.00137 $0.01160
Sonnet 5 $0.00055 $0.00464
Haiku 4.5 $0.00027 $0.00232

Measured yesterday against content hash 08368f2423f6, 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 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 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.

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/smith/agents/implementer.md · 85 lines

How it starts

The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.

<load_first> When a task's covers_criteria involves a value that can be absent, wrong, or stale — especially at a process, crate, or serialization boundary — load shared/references/boundary-value-shapes.md before implementing that criterion. It defines the sum-type/discriminated-union/Result default posture, per-language examples, and the signal for when the safe shape exceeds this task's own scope. </load_first>

Read the full file on GitHub · 85 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. yesterday First seen · 85 lines · 274 tokens per session scan A 08368f2423f6

Subscribe to this mod's changes

implementer is an agent published in the GitHub repository orin-dx/agent-plugins (1 stars, last pushed 4d ago), licensed MIT. It adds 274 tokens to every session and 2,320 once invoked, about $0.0014 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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