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Top 14 HTML Protocol Projects
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Support for anything web components-related is a death by a thousand cuts both for the browsers and for the framework authors.
For the browsers:
Shadow dom breaks almost literally everything. It's a parallel world that exists on its own and that needs dozens of additional web standards to patch holes introduced by it. And delays dozens of useful web standards that now have to be aware of it.
On top of that nothing in web components is ever created thinking even one step ahead, and break multiple pieces of basic functionality. It's a collection of barely fitting patches. E.g. at first they couldn't send data in forms. Enter FormData. Oops, still cannot be a custom form submit button. Here's a 7-year old still unresolved issue: https://github.com/WICG/webcomponents/issues/814
For frameworks:
Framework authors have to patch all thise holes on their own. Because unlike web components they actually do care about standards and browser functionality. If styles don't work, forms din't work, code doesn't work etc. because of web components, it's the framework that will be blamed.
It doesn't help that there's an insane amount of work involved in figuring out all the ways they are broken. See for example: https://xcancel.com/Rich_Harris/status/1841467510194843982#m
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AgentNetworkProtocol
AgentNetworkProtocol(ANP) is an open source protocol for agent communication. Our vision is to define how agents connect with each other, building an open, secure, and efficient collaboration network for billions of intelligent agents.
ANP: https://github.com/agent-network-protocol/AgentNetworkProtocol
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Project mention: Verifying your Matrix devices is becoming mandatory | news.ycombinator.com | 2025-11-19
It's kind of wild to me that they haven't prioritized this more. This issue has been open for almost exactly 6 years: https://github.com/matrix-org/matrix-spec/issues/565 . This one even longer: https://github.com/matrix-org/matrix-spec/issues/836 . The Matrix permission system still doesn't even have a way to say "sending images is not allowed" (either per room or per user).
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Originless
One all-in-one storage backend you can drop into anything: your own apps, screenshot tools, pastebin-style pastes, Nostr clients, Reddit posts, forum embeds—anything that needs durable, anonymous file hosting. One Originless to rule them all and keep you anonymous.
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Project mention: Show HN: Nostr Web – decentralized website hosting on Nost | news.ycombinator.com | 2025-10-23
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Astroport.ONE
A decentralized Web3 platform enabling users to create personal digital embassies for managing identity, participating in the Ğ1 cryptocurrency economy, and building interconnected communities through NOSTR + IPFS-based storage with automatic N² sync and other automated smart contracts. Discover UPlanet ORIGIN
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attribution.md
A simple way for open source maintainers to request recognition from AI coding agents
Project mention: Show HN: Steerling-8B, a language model that can explain any token it generates | news.ycombinator.com | 2026-02-24This is actually being built right now. ATTRIBUTION.md (https://attribution.md) is a protocol that does exactly this. You drop a file in your repo root with a few lines of YAML, and it asks AI coding agents to prompt users to star the repos they built on.
The key design choice is that it does not automate anything. The agent surfaces a prompt, the user decides yes or no. No bulk starring, no forced actions. The spec also deliberately stays out of licensing territory. It is purely a social recognition layer.
It is at v0.1 and no agent supports it yet, but the spec and schema are published and open for feedback: https://github.com/attributionmd/attribution.md
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mosaic-spec
Mosaic is a distributed sovereign general-purpose application protocol for the Internet.
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O4DB-Protocol
Sovereign agentic commerce protocol. Buyer-side ranking, encrypted demand commitment, and volume-weighted reputation enforcement. Patent Pending U.S. 63/993,946.
Project mention: Show HN: O4DB – Intent-based M2M protocol without centralized APIs | news.ycombinator.com | 2026-03-04 -
at1c-protocol-official
AI Agents are verified using Human consent, produce receipts with cryptography based evidence, low cost insurance policy.
Project mention: AT1C is an open protocol for cryptographically verifiable human authorisation | news.ycombinator.com | 2026-07-28 -
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agent-identity-bridge
Portable identity for AI agents across MCP, A2A, ANP protocols. One passport. Every protocol. Full audit trail.
bash git clone https://github.com/tntech-consulting/agent-identity-bridge cd agent-identity-bridge pip install -e . # Create your first passport aib create --org mycompany --agent booking --protocols mcp,a2a # Output: # ✓ ID: urn:aib:agent:mycompany:booking # → Protocols: mcp, a2a # → Expires: 2027-03-24 # List all passports aib list # Translate an A2A Agent Card to MCP Server Card echo '{"name":"My Agent","url":"https://example.com","skills":[{"id":"search","name":"Search"}]}' > card.json aib translate --from a2a --to mcp --file card.json # Revoke a compromised agent (one command, all protocols) aib revoke --id urn:aib:agent:mycompany:booking # Start the gateway aib serve --port 8420
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
HTML Protocol discussion
HTML Protocol related posts
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How Declarative Custom Elements (DCE) Could Improve Web Components
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HMP как реализация Application Layer в ANP
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Show HN: Agent Network Protocol (ANP)，Similar to an A2A
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The Problem with Web Components
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Web Components and SSR - 2024 Edition
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DOM Part API Proposal
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How do HTML event handlers work?
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A note from our sponsor - SaaSHub
www.saashub.com | 18 Aug 2026
Index
What are some of the best open-source Protocol projects in HTML? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | webcomponents | 4,491 |
| 2 | AgentNetworkProtocol | 1,390 |
| 3 | specs | 1,236 |
| 4 | matrix-spec | 325 |
| 5 | fix-simple-binary-encoding | 313 |
| 6 | Originless | 72 |
| 7 | nw-nips | 25 |
| 8 | Astroport.ONE | 16 |
| 9 | attribution.md | 5 |
| 10 | mosaic-spec | 3 |
| 11 | O4DB-Protocol | 2 |
| 12 | at1c-protocol-official | 2 |
| 13 | traveltelly | 1 |
| 14 | agent-identity-bridge | 0 |
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