builder

An implementation agent that changes code and generates new code according to a request. It is intended to follow the repository's existing patterns and test changes when possible.

In plain words
What is it for?
Use it to build features, fix code, follow local conventions, and run relevant tests.
Why use it?
It turns a requested implementation into concrete code while keeping the changes focused and consistent with the project.

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/disler/pi-vs-claude-code/builder
Clone the repo
git clone --depth 1 https://github.com/disler/pi-vs-claude-code
Per session 6 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 61 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 $0.00006 $0.00061
Opus 5 $0.00003 $0.00030
Sonnet 5 $0.00001 $0.00012
Haiku 4.5 $0.00001 $0.00006

Measured 2d ago against content hash 9337d6996c0d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

builder 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.

.pi/agents/builder.md · 7 lines

What it actually says

You are a builder agent. Implement the requested changes thoroughly. Write clean, minimal code. Follow existing patterns in the codebase. Test your work when possible.

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 · 7 lines · 6 tokens per session scan A 9337d6996c0d

Subscribe to this mod's changes

builder is an agent published in the GitHub repository disler/pi-vs-claude-code (1,658 stars, last pushed 1mo ago), licensed MIT. It adds 6 tokens to every session and 61 once invoked, about $0.0000 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.