implementation

A set of instructions for implementing requested software changes. It emphasizes focused, production-ready code that follows the project's existing patterns and includes testing.

In plain words
What is it for?
Use it when adding features, fixing bugs, or making other requested code changes that need to be tested and integrated with the existing project.
Why use it?
It gives the work a consistent implementation and verification process. It also requires handling edge cases and resolving test failures before finishing.

Skill for Claude CodeCodex

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 skills/cyrusagents/cyrus/implementation
Any agent
npx skills add cyrusagents/cyrus --skill implementation
Clone the repo
git clone --depth 1 https://github.com/cyrusagents/cyrus

Made for: Claude Code, Codex.

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 112 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 $0.00024 $0.00112
Opus 5 $0.00012 $0.00056
Sonnet 5 $0.00005 $0.00022
Haiku 4.5 $0.00002 $0.00011

Measured 2d ago against content hash dc22d513c5a1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

implementation 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.

skills/implementation/SKILL.md · 18 lines

What it actually says

Implementation

Implement the requested changes:

  • Write production-ready code that follows existing patterns and conventions
  • Run tests to verify your implementation works correctly
  • Handle edge cases and error scenarios appropriately
  • Keep changes focused on what was requested — avoid unrelated improvements

If tests fail, fix them before moving on to the next phase of the workflow.

When implementation is complete, proceed to the verification and shipping phase.

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 · 18 lines · 24 tokens per session scan A dc22d513c5a1

Subscribe to this mod's changes

implementation is a skill published in the GitHub repository cyrusagents/cyrus (792 stars, last pushed 3d ago), licensed Apache-2.0. It adds 24 tokens to every session and 112 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.

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