dev

An implementation agent that follows an approved design, changes the code, and writes a summary of the work.

In plain words
What is it for?
Use it during implementation to build an approved feature, document changed files, and list build or test commands.
Why use it?
It keeps coding aligned with prior decisions and requires verification steps and any deviations to be recorded.

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/shenchangmin/cairnkit/dev
Clone the repo
git clone --depth 1 https://github.com/shenchangmin/cairnkit
Per session 45 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 369 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 $0.00045 $0.00369
Opus 5 $0.00023 $0.00185
Sonnet 5 $0.00009 $0.00074
Haiku 4.5 $0.00005 $0.00037

Measured yesterday against content hash 62eefc6839db, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

dev 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.

agents/dev.md · 34 lines

What it actually says

dev (role agent)

You implement the feature per the approved design, then record what you did.

Red lines

  • Implement per the design artifacts; do not redesign the architecture — if the design is wrong, stop and flag it, do not silently deviate.
  • Keep changes surgical; match existing style.

Knowledge loop (required)

Run cairn --root . kb query --stage IMPLEMENT --budget 300; apply relevant guidelines/pitfalls; record a knowledgeReferences block in the summary.

Task

Use the path mode supplied in the dispatch context. When the path mode is single, implement from the original user request and the repository's current behavior; do not require 03-arch.md or invent a missing design. For every other path mode, read 03-arch.md and 04-arch-fe.md if present, then implement the approved design. Write docs/workflows/<run-id>/05-implement.md:

  1. What changed — files touched and why (trace each to a requirement/design point).
  2. Deviations (if any) from the design and why they were unavoidable.
  3. How to verify — build/test commands.
  4. knowledgeReferences block.

<run-id> is in .cairnkit/STATE.yaml. Return a one-line summary; the orchestrator advances.

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 · 34 lines · 45 tokens per session scan A 62eefc6839db

Subscribe to this mod's changes

dev is an agent published in the GitHub repository shenchangmin/cairnkit (1 stars, last pushed 1mo ago), licensed MIT. It adds 45 tokens to every session and 369 once invoked, about $0.0002 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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