Browser-based page reading
Visits a URL in a real Chromium browser after JavaScript has run, so the response reflects the rendered page rather than raw HTML.
Manifest
RivendicaManifest is an API that turns webpages into structured JSON action maps for AI agents. See required fields, allowed actions, and page dependencies.
Overview
Manifest is an API for turning a webpage into a structured action map for AI agents. Instead of asking an agent to infer what it can click or fill from a screenshot or from raw page text, it returns a JSON manifest that describes the available actions, the fields they require, and the page navigation that surrounds them.
The product is aimed at developers building agents that need to interact with real websites. The site positions Manifest as the layer between browser access and task execution: it identifies buttons, inputs, forms, and dependencies so an agent can reason about a page and act on it without relying on hand-written selectors.
What Manifest does
Accessibility-tree analysis
Uses the accessibility tree to identify elements in the same way assistive technologies do, helping it understand what controls are present and what they do.
DOM cross-checking
Cross-references the DOM to capture details the accessibility tree may miss, including required fields, input types, placeholders, disabled states, and dependencies.
Structured action output
Returns a structured JSON manifest with actions, requirements, dependencies, and navigation that an agent can consume directly.
Deterministic locator resolution
Resolves locators deterministically after the model identifies actions, and marks ambiguous matches as uncertain instead of guessing.
API-ready workflow
Provides a documented API with authentication, health and session-status endpoints, and caching for repeated URL requests.
Where Manifest fits
Agent page understanding
Use Manifest when an agent needs to determine which controls are available on a webpage and what each control does before attempting an action.
Form completion flows
Use it for workflows like filling and submitting forms, where the agent must know which fields are required and whether a submit button depends on them.
Navigation-aware agents
Use it when building systems that need to follow site navigation while keeping track of the page’s interactive elements in a structured way.
Selector-free automation
Use it to reduce reliance on hand-maintained CSS selectors, especially for sites that redesign often and break brittle automation.
Pros and Cons
Pros
- Turns a URL into structured JSON describing available actions and required inputs.
- Uses a real browser and the accessibility tree plus DOM details, which is more specific than text-only extraction.
- Includes dependency information such as fields that must be completed before a submit action is valid.
- Documents authentication, rate limits, caching, health, and session-status endpoints.
- Aims at agent workflows where pages change over time and selectors are fragile.
Cons
- The source does not show an integrations list or packaged connectors, so setup details beyond the API are unclear.
- The docs mention ambiguous matches can be marked uncertain, which means not every page element is guaranteed to resolve cleanly.
FAQ
What kind of product is Manifest?
Manifest is a developer tool for making webpages readable to AI agents as structured actions. It is designed for agents that need to interact with real pages, not just read text.
How does the API work at a high level?
The docs show a POST /manifest endpoint that accepts a URL and returns a JSON response with the page state, available actions, and navigation links.
What does Manifest return in the response?
The output includes fields such as actions, their labels and types, whether they are required, and dependency information for actions that must be completed first.
Are there any operational limits or error cases documented?
The source describes a Browser session unavailable error and says the API uses caching for 6 hours by default, with repeated requests served from cache within that window.
Who is Manifest for?
The about page says Omfang AB is a small Swedish company building infrastructure for the agentic web, and Manifest is intended for developers building AI agents that interact with webpages.
Quick Facts
- Category
- Developer Tool
- Primary users
- Developers building AI agents
- Product form
- API
- Core output
- Structured JSON action manifest
- Website
- omfang.io
- Company
- Omfang AB
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