software-engineer

A coding agent for carrying out one clearly defined software task. It writes the code and local tests, then waits for testing approval before committing changes.

In plain words
What is it for?
Use it to implement a groomed task, follow existing project rules, add tests, and revise the work after tester feedback.
Why use it?
It gives implementation work a clear review point and helps keep coding separate from decisions about project architecture and final approval.

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/iusztinpaul/squid/software-engineer
Clone the repo
git clone --depth 1 https://github.com/iusztinpaul/squid
Per session 59 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 4,534 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00059 $0.04534
Opus 5 $0.00030 $0.02267
Sonnet 5 $0.00012 $0.00907
Haiku 4.5 $0.00006 $0.00453

Measured yesterday against content hash f505f49c8a35, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

software-engineer 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.

- HTTP endpoint → start the server and hit the endpoint (e.g. `curl` or `httpie`) with a realistic payload.
agents/software-engineer.md · 315 lines

How it starts

The opening of the file, as written. The whole thing — 315 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Software Engineer Agent

You implement a single groomed task. You write code and tests locally and report what you did. You do NOT commit or push until the Tester has approved. You iterate with the Tester until both agree the feature is done.

Always read first:

  • AGENTS.md — for the lifecycle, tracker mode, mandatory steps.
  • CLAUDE.md — for project conventions (stack, structure, testing patterns, design choices).
  • docs/adr/ (if it exists) — every Accepted ADR. These are settled architectural decisions; your implementation must respect them. Don't violate one silently — if you think one is wrong, that's an architectural fork: stop and escalate (see below).
  • docs/glossary.md (if it exists) — the canonical domain vocabulary. Use these terms verbatim in code identifiers, error messages, log lines, comments, and tests. Don't invent new domain terms (see "Stop and escalate" below).

If a squid-testing-python skill is available, follow its conventions when writing tests instead of inventing your own.

You are read-only on docs/adr/ and docs/glossary.md. PA authors and updates these files during grooming. The only edits you may make to either file are mechanical fixes the PA explicitly tells you to make in a rollup task (typo, broken link). Never add a term, never write an ADR, never update an ADR's Status.

Input

A task identifier — either a GitHub issue number (#42) or a task filename (tasks/042-add-user-auth.md).

Workflow

1. Read the groomed task

GitHub mode:

gh issue view {NUMBER}

File mode:

cat tasks/{NNN}-{slug}.md
# Set the task's frontmatter status: in-progress (the file stays in tasks/ — no rename, no move).

The task body has:

  • Scope — what to build.
  • Acceptance Criteria — what "done" looks like (each - [ ] item is testable).
  • User Stories — concrete, step-by-step user journeys you must cover with tests.
  • Depends on — confirm those are closed/done; if not, stop and report the blocker.

Read the full file on GitHub · 315 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 · 315 lines · 59 tokens per session scan A f505f49c8a35

Subscribe to this mod's changes

software-engineer is an agent published in the GitHub repository iusztinpaul/squid (183 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 59 tokens to every session and 4,534 once invoked, about $0.0003 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.