form-filling

form-filling is a skill for Claude Code, Codex from platonai/Browser4. It costs 36 tokens per session (841 once invoked), scanned A, original, Apache-2.0.

A web form automation tool that fills named fields with supplied values and can optionally submit the form.

In plain words
What is it for?
Use it to fill contact forms, test different field values, or submit website forms with provided data.
Why use it?
It removes repetitive manual typing and makes structured form testing or submission easier.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

About the project

Browser4 is an AI-native browser engine that lets autonomous agents and people control real browsers, extract information from web pages, and automate tasks at scale. It combines browser interaction through a Rust CLI and MCP with deterministic selectors, machine-learning clustering, and language-model extraction. The catalogue entries provide skills and instructions for using Browser4.

platonai/Browser4 · 1,122 stars · on GitHub · browser4.io

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/platonai/browser4/form-filling
Any agent
npx skills add platonai/Browser4 --skill form-filling
Clone the repo
git clone --depth 1 https://github.com/platonai/Browser4

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 form-filling

README.md
[![agentmods](https://agentmods.dev/badge/skills/platonai/browser4/form-filling.svg)](https://agentmods.dev/skills/platonai/browser4/form-filling)
Your own site
<a href="https://agentmods.dev/skills/platonai/browser4/form-filling"><img src="https://agentmods.dev/badge/skills/platonai/browser4/form-filling.svg" alt="Measured on agentmods" height="20"></a>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 841 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 5.1 $0.00036 $0.00841
Opus 5 $0.00018 $0.00420
Sonnet 5 $0.00007 $0.00168
Haiku 4.5 $0.00004 $0.00084

Measured 6d ago against content hash 1f1b5b8a6d93, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

form-filling 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 6d 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.

browser4-agentic/src/main/resources/skills/form-filling/SKILL.md · 132 lines

How it starts

The opening of the file, as written. The whole thing — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Form Filling Skill

Description

Automatically fill web forms with provided data. This skill handles various form field types and can optionally submit the form after filling.

Dependencies

  • web-scraping - Required for detecting form fields and structure

Parameters

Parameter Type Required Default Description
url String Yes - The URL of the page containing the form
formData Map<String, String> Yes - Key-value pairs representing field names and values
submit Boolean No false Whether to submit the form after filling

Return Value

Returns a SkillResult with the following data structure:

{
  "url": "string",
  "filledFields": ["field1", "field2"],
  "submitted": boolean,
  "message": "status message"
}

Usage Examples

Basic Form Filling

val result = registry.execute(
    skillId = "form-filling",
    context = context,
    params = mapOf(
        "url" to "https://example.com/contact",
        "formData" to mapOf(
            "name" to "John Doe",
            "email" to "[email protected]",
            "message" to "Hello!"
        )
    )
)

Form Filling with Submission

val result = registry.execute(
    skillId = "form-filling",
    context = context,
    params = mapOf(
        "url" to "https://example.com/signup",
        "formData" to mapOf(
            "username" to "johndoe",
            "password" to "securepass123",
            "email" to "[email protected]"
        ),
        "submit" to true
    )
)

Tool Call Specification

ToolSpec(
    domain = "skill.form",
    method = "fill",
    arguments = [
        "url: String",
        "formData: Map<String, String>",
        "submit: Boolean = false"
    ],
    returnType = "SkillResult",
    description = "Fill a web form with the provided data"
)

Error Handling

The skill returns a failure result in the following cases:

  • Missing required parameter url
  • Missing required parameter formData
  • Empty formData map
  • Form fields not found on the page

Read the full file on GitHub · 132 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 6d ago First seen · 132 lines · 36 tokens per session scan A 1f1b5b8a6d93

Subscribe to this mod's changes

form-filling is a skill published in the GitHub repository platonai/Browser4 (1,122 stars, last pushed today), licensed Apache-2.0. It adds 36 tokens to every session and 841 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 2026-08-30.

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