{ "slug": "canonical-resources", "title": "Canonical Resources", "description": "A curated source list for tracking the headless economy — protocols, payments, AI platforms, discovery standards, hybrid companies, and analysis streams.", "section": "resources", "order": 1, "author": "get-headless", "url": "https://get-headless.ai/knowledge-base/canonical-resources/", "apiUrl": "https://get-headless.ai/api/knowledge-base/canonical-resources.json", "markdownUrl": "https://get-headless.ai/knowledge-base/canonical-resources.md", "content": "A curated source list for tracking the headless economy: the shift from GUI-first software toward machine-native surfaces that agents can discover, evaluate, access, pay for, and operate through protocols, APIs, CLIs, SDKs, MCP servers, structured content, and agent-facing documentation.\n\n
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ResourceDescription
Protocols and standards
Model Context ProtocolThe canonical protocol for connecting AI agents and applications to tools, data, APIs, and external systems.
Agent2Agent ProtocolOpen protocol for agent-to-agent discovery and communication, including the Agent Card pattern for publishing agent capabilities.
Agent Communication ProtocolOpen standard from IBM Research and the Linux Foundation for agent-to-agent messaging, task hand-off, and lifecycle. Layers above MCP — where MCP exposes tools to a single agent, ACP coordinates between agents across frameworks and runtimes.
OpenAPI SpecificationMature standard for describing HTTP APIs in a machine-readable way. Still one of the most important foundations for agent-usable software.
agents.jsonEmerging proposal for exposing agent-facing API and interaction metadata. Relevant for making products more legible to autonomous systems.
llms.txtProposed convention for publishing a Markdown entry point that helps LLMs and agents understand a website's most important content.
WebMCPBrowser-side pattern for exposing website functionality as structured tools rather than forcing agents to rely only on scraping or DOM navigation.
Agent SkillsLightweight format for packaging task-specific instructions, scripts, templates, and resources that agents can use across contexts.
OAuth 2.0 Protected Resource MetadataStandard for publishing metadata about OAuth-protected resources. Relevant for agent authentication and protected API discovery.
Agent-to-User Interface ProtocolProtocol for agents returning structured user interfaces rather than only text. Relevant for agent-native product experiences.
Agent-User Interaction ProtocolEvent-based protocol for streaming agent state, text, tool calls, and UI interactions to frontends.
Universal Commerce ProtocolOpen standard from Google and Shopify for agentic commerce — discovery, checkout, orders, identity. Built on REST/JSON-RPC with MCP, A2A, and AP2 support built in.
Payments and commerce protocols
Machine Payments ProtocolOpen protocol for machine-to-machine payments. Designed for APIs, tools, and content that agents can pay for directly in the request flow.
MPP specificationsTechnical specification surface for MPP, including payment authentication, charge, discovery, MCP transport, and payment-method-specific flows.
x402Internet-native payment protocol based on HTTP 402 Payment Required. Important for paid APIs, content, services, and agent-to-server transactions.
Agentic Commerce ProtocolOpen commerce protocol for agent-mediated shopping and checkout while preserving merchant control over products, orders, and payment flows.
Stripe Agentic CommerceStripe's canonical documentation for enabling secure commerce between buyers, agents, and businesses.
Agent Payments ProtocolProtocol for agent payments with authorization, mandates, and auditability. Relevant where agents transact on behalf of humans or businesses.
AI platform and developer resources
OpenAI DevelopersOfficial developer hub for OpenAI's agent-facing surfaces, including apps, tools, commerce, and ChatGPT-connected product patterns.
OpenAI Apps SDKCanonical source for building ChatGPT-connected apps backed by MCP servers and machine-native interfaces.
Google Developers BlogOfficial source for Google's agent protocol, interoperability, and developer platform updates.
Google Agent Protocols GuideUseful overview of how MCP, A2A, UCP, AP2, A2UI, and AG-UI fit into agent architecture.
Anthropic EngineeringOne of the highest-signal primary sources on agent design, tool design, context engineering, MCP, skills, and autonomous coding systems.
Cloudflare AgentsCloudflare's developer platform for building and deploying agents, including Workers, Durable Objects, tools, scheduling, and MCP support.
Playwright MCPBrowser automation through MCP. Relevant for how agents interact with websites through structured browser control.
Vercel agent-browserBrowser automation CLI for agents. Useful reference for token-efficient browser interaction and headless browsing workflows.
Discovery, readiness, and machine-readable web
Markdown for AgentsCloudflare documentation for serving Markdown versions of pages to agents through content negotiation.
Content Signals PolicyPolicy mechanism for expressing preferences around search, AI input, and AI training usage.
Web Bot AuthProposal for cryptographically identifying legitimate bots and agents rather than relying only on user-agent strings or IP lists.
Schema.orgShared vocabulary for structured data. Important for making products, organizations, people, events, and actions machine-readable.
JSON-LDLinked-data JSON format commonly used with Schema.org. Useful for giving agents explicit semantic context on web pages.
Hybrid companies at the edge of the headless economy
Stripe BlogPrimary source for Stripe's thinking on agentic commerce, payment infrastructure, internet-native business models, and merchant readiness.
Ramp for AgentsStrong example of incumbent business software becoming explicitly agent-facing through CLI and MCP-style surfaces.
Ramp CLIConcrete implementation of a finance product exposed through a terminal and AI-agent-usable command surface.
Ramp BlogUseful source for Ramp's agentic finance, AP automation, accounting agents, and operational AI product direction.
Cloudflare BlogInfrastructure source for how the web adapts to agents: MCP, bot identity, content negotiation, Workers, and agent deployment.
LinearProduct company building toward human-and-agent workflows in software development and product operations.
Linear MCP DocsDirect source for Linear's MCP server and agent-usable product surface.
NotionWorkspace product moving toward AI agents, automation, enterprise search, and machine-mediated work.
Notion MCP DocsOfficial documentation for Notion's hosted MCP server, allowing AI tools to securely access Notion workspaces.
Notion BlogOngoing source for Notion's AI workspace, custom agents, and agent-native product direction.
Slack BlogOfficial source for Slack's evolution into an AI context layer and agentic work surface.
Slack MCP GuidePractical source for how Slack exposes workspace context and actions to AI assistants through MCP.
Related blogs and analysis streams
Fintech BrainfoodSimon Taylor's recurring analysis on fintech, payments, AI, stablecoins, wallets, and infrastructure shifts relevant to agentic commerce.
MPP BlogOngoing protocol source for machine payments, per-request pricing, paid APIs, and agent-to-service payment flows.
Simon Willison's WeblogHigh-signal independent source on LLMs, agents, MCP, tool use, prompt injection, and machine-consumable software patterns.
Latent SpaceTechnical newsletter and podcast covering agents, AI engineering, infrastructure, MCP, and developer ecosystem shifts.
EveryRecurring source on AI product design, agent-native software, and emerging business models around AI workflows.
Benedict EvansStrategy source for interface shifts, platform transitions, value capture, and market structure in technology.
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