coding-conventions

coding-conventions is a skill for Claude Code, Codex from sandydasari/openacme. It costs 27 tokens per session (602 once invoked), scanned A, original, MIT.

A general set of coding guidelines for agents modifying an existing codebase. It emphasizes reading related code first, making the smallest necessary change, and matching existing patterns.

In plain words
What is it for?
Use it before editing unfamiliar code to inspect callers and tests, choose narrow types, keep diffs focused, and add comments only when the reason is not obvious.
Why use it?
It helps avoid unnecessary refactors, new dependencies, and abstractions that do not belong in the requested change.

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/sandydasari/openacme/coding-conventions
Any agent
npx skills add sandydasari/openacme --skill coding-conventions
Clone the repo
git clone --depth 1 https://github.com/sandydasari/openacme

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for coding-conventions

README.md
[![agentmods](https://agentmods.dev/badge/skills/sandydasari/openacme/coding-conventions.svg)](https://agentmods.dev/skills/sandydasari/openacme/coding-conventions)
Your own site
<a href="https://agentmods.dev/skills/sandydasari/openacme/coding-conventions"><img src="https://agentmods.dev/badge/skills/sandydasari/openacme/coding-conventions.svg" alt="Measured on agentmods" height="20"></a>
Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 602 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 $0.00027 $0.00602
Opus 5 $0.00014 $0.00301
Sonnet 5 $0.00005 $0.00120
Haiku 4.5 $0.00003 $0.00060

Measured 4d ago against content hash 9902b71993d6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

coding-conventions 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 4d 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.

packages/skills/builtin/coding-conventions/SKILL.md · 54 lines

How it starts

The opening of the file, as written. The whole thing — 54 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Coding conventions

Generic guardrails for any agent that writes or modifies code. Load this skill when you're about to touch a codebase you don't fully own.

Read before you write

Read the file you're about to modify. Read its callers. Read the test that covers it. The shape that already exists is the shape — match it. Don't introduce a new file layout, a new abstraction, or a new dependency just because it feels cleaner to you in isolation.

Smallest viable change

The diff should answer the request and nothing else. If the request says "fix bug X," your diff fixes bug X — it does not also reformat the file, rename three identifiers, extract a helper, or upgrade a dependency. Each of those is a separate decision the user has not made yet.

Three similar lines beats a premature abstraction. Wait for the fourth before factoring.

Comments

Default: don't write one. Names and types do the explaining. Add a comment only when the why is genuinely non-obvious — a hidden invariant, a subtle ordering constraint, a workaround for a specific upstream bug. Keep it one line. Don't explain what the code does; the reader can see that.

Never write multi-paragraph docstrings. Never reference the current ticket or the caller list — both rot.

Types

Prefer narrow types over any / unknown / wide unions. Make illegal states unrepresentable when it's cheap.

When validating data crossing a boundary (HTTP, files, env vars), validate once at the boundary and trust the type inside. Don't re-validate in every internal function.

Errors

Throw Error with a clear, specific message. Don't swallow. Don't wrap in try/catch just to log-and-rethrow.

Don't add error handling for cases that can't happen. Trust internal invariants; only validate at boundaries.

Dependencies

Don't add a dependency for something you can write in 20 lines. Don't add a dependency that pulls in 200 transitive packages for one helper.

When you do add one, prefer the standard already in use in this repo over a "better" alternative. Consistency beats individual optimization.

Read the full file on GitHub · 54 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. 4d ago First seen · 54 lines · 27 tokens per session scan A 9902b71993d6

Subscribe to this mod's changes

coding-conventions is a skill published in the GitHub repository sandydasari/openacme (86 stars, last pushed 1mo ago), licensed MIT. It adds 27 tokens to every session and 602 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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