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conformal: Instructions file for Codex

AGENTS.md

conformal AGENTS.md is an instructions file for Codex, OpenCode from marcomuser/conformal. It costs 669 tokens per session, scanned A, original, MIT.

Project instructions for Conformal, a TypeScript library for reading, converting, validating, and serializing form data.

In plain words
What is it for?
Use them when developing or reviewing Conformal's form-data utilities and integrations with validation libraries.
Why use it?
They document the public API and rules that protect nested data, schemas, and object paths from unsafe behavior.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is marcomuser/conformal's own configuration. It tells Codex and OpenCode how to work on conformal itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything conformal configures →

not rated 39repo 1y ago A scan 669 tokens original MIT
View source ↗ marcomuser/conformal npmjs.com
Reuse

Borrowing it

Nothing to install: this file belongs to marcomuser/conformal. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/marcomuser/conformal/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/marcomuser/conformal

Made for: Codex, OpenCode.

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 conformal AGENTS.md

README.md
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Your own site
<a href="https://agentmods.dev/instructions/marcomuser/conformal/agents-md"><img src="https://agentmods.dev/badge/instructions/marcomuser/conformal/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for conformal AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/marcomuser/conformal/agents-md"><img src="https://agentmods.dev/badge/instructions/marcomuser/conformal/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 669 This file is loaded in full into every session.
When invoked 669 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00669 $0.00669
Opus 5.5 $0.00268 $0.00268
Sonnet 5.5 $0.00134 $0.00134
Haiku 4.5 $0.00067 $0.00067

Measured 2mo ago against content hash 2aa266584503, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

conformal AGENTS.md 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 2mo 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.

AGENTS.md · 59 lines

How it starts

The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Conformal — AGENTS.md

Agent-focused notes for safe, fast contributions. Format reference: agents.md.

Setup

npm i
npm run typecheck
npm run test

Examples:

cd examples/react && npm i && npm run dev
cd examples/svelte && npm i && npm run dev

Public API

  • conformal: getPath, setPath, decode, parseFormData, serialize, coerceString, coerceNumber, coerceBigint, coerceBoolean, coerceDate, coerceFile, coerceArray; types: PathsFromObject, Submission
  • conformal/valibot: coerceString, coerceNumber, coerceBoolean, coerceDate, coerceBigint, coerceFile, coerceArray (experimental)
  • conformal/zod: string, number, boolean, date, bigint, enum, file, url, email, object, array (deprecated)

Exports live in src/index.ts, src/valibot/index.ts, and src/zod/index.ts.

Non‑negotiable invariants

  • parseFormData is synchronous; throw TypeError("Schema validation must be synchronous") if schema returns a Promise.
  • setPath/getPath are immutable and prototype‑safe (block __proto__, constructor.prototype); support nested arrays/objects and sparse indices.
  • Submission always includes input; separate fieldErrors (dot/bracket paths, numeric indices in brackets) from formErrors.
  • serialize: number/bigint → .toString(), boolean → "on"/"" (configurable), Date → ISO via .toISOString().
  • Types InputValue<T> and PathsFromObject<T> must remain correct for nested structures and browser types.

Code style

  • TypeScript strict mode (see tsconfig.json flags).
  • ESM-only, isomorphic runtime (no Node-only APIs).
  • Prettier formatting: npm run format:write.
  • Keep runtime deps minimal; valibot is an optional peer dependency.

Build & test

# Fast local CI
npm run format:check && npm run typecheck && npm run test

# Focus tests
npx vitest run -t "<name>"      # by test name
npx vitest run test/parse.test.ts

Quick playbooks

Read the full file on GitHub · 59 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. 2mo ago First seen · 59 lines · 669 tokens per session scan A 2aa266584503

Subscribe to this mod's changes

conformal AGENTS.md is an instructions file published in the GitHub repository marcomuser/conformal (39 stars, last pushed 1y ago), licensed MIT. It adds 669 tokens to every session, about $0.0027 per session on Opus 5.5. 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 2026-09-01.

LanguagesTypeScriptformdataschemasubmission
Related

conformal AGENTS.md compared with instructions from other repositories

conformal AGENTS.md next to 6 instructions from other repositories
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conformal AGENTS.mdmarcomuser/conformalInstructions file391y agoMITA669Codex, OpenCode
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deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode