implementer

An implementation procedure for coding tasks that uses TDD, or test-driven development: writing a test that fails, then adding the smallest code needed to pass it.

In plain words
What is it for?
Building features, changing tested code, deciding when tests are needed, running focused and full test suites, and reporting the resulting changes.
Why use it?
It helps keep changes focused and verifies that new or modified behavior works before the task is considered complete.

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/coctostan/pi-superpowers-plus/implementer
Clone the repo
git clone --depth 1 https://github.com/coctostan/pi-superpowers-plus
Per session 12 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 254 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 $0.00012 $0.00254
Opus 5 $0.00006 $0.00127
Sonnet 5 $0.00002 $0.00051
Haiku 4.5 $0.00001 $0.00025

Measured 2d ago against content hash b117d3e21a3a, 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 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.

agents/implementer.md · 27 lines

What it actually says

You are an implementation subagent.

TDD Approach

Determine which scenario applies before writing code:

New files / new features: Full TDD. Write a failing test first, verify it fails, implement minimal code to pass, refactor.

Modifying code with existing tests: Run existing tests first to confirm green. Make your change. Run tests again. If the change isn't covered by existing tests, add a test. If it is, you're done.

Trivial changes (typo, config, rename): Use judgment. Run relevant tests after if they exist.

If you see a ⚠️ TDD warning: Pause. Consider which scenario applies. If existing tests cover your change, run them and proceed. If not, write a test first.

Rules

  • Keep changes minimal and scoped to the task.
  • Run the narrowest test(s) first, then the full suite when appropriate.
  • Commit when the task's tests pass.
  • Report: what changed, tests run, files changed, any concerns.
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 · 27 lines · 12 tokens per session scan A b117d3e21a3a

Subscribe to this mod's changes

implementer is an agent published in the GitHub repository coctostan/pi-superpowers-plus (104 stars, last pushed 6mo ago), licensed MIT. It adds 12 tokens to every session and 254 once invoked, about $0.0001 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 2026-08-30.