canon-forms

canon-forms is a skill for Claude Code, Codex from Dragoon0x/canon. It costs 81 tokens per session (3,065 once invoked), scanned A, original, MIT.

A set of rules for designing forms, which are interfaces where users enter and submit information.

In plain words
What is it for?
Use it to structure inputs, labels, hints, validation, autocomplete, error handling, submit flows, and multi-step forms.
Why use it?
It helps prevent confusing fields, unclear labels, poor validation, and error messages that cause people to abandon a form or submit bad data.

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/dragoon0x/canon/canon-forms
Any agent
npx skills add Dragoon0x/canon --skill canon-forms
Clone the repo
git clone --depth 1 https://github.com/Dragoon0x/canon

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 canon-forms

README.md
[![agentmods](https://agentmods.dev/badge/skills/dragoon0x/canon/canon-forms.svg)](https://agentmods.dev/skills/dragoon0x/canon/canon-forms)
Your own site
<a href="https://agentmods.dev/skills/dragoon0x/canon/canon-forms"><img src="https://agentmods.dev/badge/skills/dragoon0x/canon/canon-forms.svg" alt="Measured on agentmods" height="20"></a>
Per session 81 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,065 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 $0.00081 $0.03065
Opus 5 $0.00041 $0.01533
Sonnet 5 $0.00016 $0.00613
Haiku 4.5 $0.00008 $0.00307

Measured 5d ago against content hash 73d92a80d4e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

canon-forms 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 5d 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.

source/skills/canon-forms/SKILL.md · 325 lines

How it starts

The opening of the file, as written. The whole thing — 325 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CANON · Forms

Forms are the highest-stakes interface in any product. A confusing form costs conversions in marketing, costs data in apps, and costs trust everywhere. Most form failures are predictable.

Quantified Rules

Field Structure

<div class="field">
  <label for="email">Email address</label>
  <input
    id="email"
    name="email"
    type="email"
    autocomplete="email"
    required
    aria-describedby="email-hint"
  />
  <span id="email-hint" class="hint">We'll never share your email.</span>
</div>
Element Required Reason
<label> with for Yes Click target + screen reader
id matching for Yes WCAG 1.3.1
name Yes (for submission) Server identification
type Yes Native validation + mobile keyboard
autocomplete Yes (where applicable) Browser fill, password managers
required If required Native validation
aria-describedby If hint or error SR announces context

Label Placement

Placement When Source
Above input (block) Default. Best scan speed and mobile-friendly. Nielsen Norman
Inline left Settings panels with short fixed labels Acceptable
Floating label Material 3 style OK; preserve label always-visible at zoom
Placeholder as label Never WCAG 3.3.2 violation

Default to labels above inputs. Closer scan path, more mobile space, easier to align.

Label-to-Input Gap

4–8px between label and its input.

Less = cramped. More breaks proximity grouping (Gestalt).

Field-to-Field Gap

16–24px between fields.

Tighter feels rushed. Wider breaks form rhythm.

Input Sizing

Property Value Source
Height 44–48px (touch) iOS HIG, Material 3
Padding 12px V, 16px H Material 3
Font-size 16px minimum on mobile Below 16px triggers iOS zoom-on-focus
Border 1px solid, contrast >= 3:1 WCAG 1.4.11
Border radius 4–8px Match other components
Min width 200px (single-line) Usability

Read the full file on GitHub · 325 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. 5d ago First seen · 325 lines · 81 tokens per session scan A 73d92a80d4e9

Subscribe to this mod's changes

canon-forms is a skill published in the GitHub repository Dragoon0x/canon (5 stars, last pushed 4mo ago), licensed MIT. It adds 81 tokens to every session and 3,065 once invoked, about $0.0004 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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