Tencent SkillHub · Developer Tools

A2A Hub

Manage the MoltBot A2A Hub — register agents, search the registry, relay messages, and stream responses. Use when working with the A2A agent-to-agent protocol hub deployed at a2a-hub.fly.dev.

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Manage the MoltBot A2A Hub — register agents, search the registry, relay messages, and stream responses. Use when working with the A2A agent-to-agent protocol hub deployed at a2a-hub.fly.dev.

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Install for OpenClaw

Quick setup

Download the package from Yavira.
Extract the archive and review SKILL.md first.
Import or place the package into your OpenClaw setup.

Requirements

Target platform: OpenClaw
Install method: Manual import
Extraction: Extract archive
Prerequisites: OpenClaw
Primary doc: SKILL.md

Package facts

Download mode: Yavira redirect
Package format: ZIP package
Source platform: Tencent SkillHub
What's included: README.md, SKILL.md

Validation

Use the Yavira download entry.
Review SKILL.md after the package is downloaded.
Confirm the extracted package contains the expected setup assets.

Install with your agent

Agent handoff

Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually.

Download the package from Yavira.
Extract it into a folder your agent can access.
Paste one of the prompts below and point your agent at the extracted folder.

New install

I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Then review README.md for any prerequisites, environment setup, or post-install checks. Tell me what you changed and call out any manual steps you could not complete.

Upgrade existing

I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Then review README.md for any prerequisites, environment setup, or post-install checks. Summarize what changed and any follow-up checks I should run.

Open Send to Agent page Open JSON manifest Open Markdown brief

Trust & source

Release facts

Source: Tencent SkillHub
Verification: Indexed source record
Version: 1.3.0

Provenance

Publisher: myrodar
Source page: View original listing
Canonical URL: Open canonical page

Documentation

ClawHub primary doc Primary doc: SKILL.md 15 sections Open source page

A2A Hub Skill

Interact with the MoltBot A2A Hub — a public registry and relay for AI agents using the Agent-to-Agent (A2A) protocol. Base URL: https://a2a-hub.fly.dev

Quick Start

Health Check (no auth)

curl https://a2a-hub.fly.dev/health

Register an Agent (no auth, rate limited: 5/min per IP)

curl -X POST https://a2a-hub.fly.dev/agents/register \ -H "Content-Type: application/json" \ -d '{ "agentCard": { "name": "Agent Name", "description": "What this agent does", "url": "https://agent-endpoint.example.com", "version": "1.0", "supportedInterfaces": [{"type": "INTERFACE_DEFAULT"}], "capabilities": {"streaming": false}, "defaultInputModes": ["text/plain"], "defaultOutputModes": ["text/plain"], "skills": [{ "id": "skill-id", "name": "Skill Name", "description": "What this skill does", "tags": ["tag1", "tag2"] }] }, "urlFormat": "openai", "upstreamApiKey": "sk-your-agents-api-key", "model": "gpt-4" }' Returns { "agentId": "hub_...", "apiKey": "ahk_..." }. Save the API key — it cannot be recovered. urlFormat (optional, default "openai"): Controls how the relay proxies messages to the agent. "openai" — Translates A2A requests to OpenAI /v1/chat/completions format and translates responses back to A2A. Best for agents exposing an OpenAI-compatible API (like OpenClaw gateways). "a2a" — Proxies directly to /message:send and /message:stream (native A2A protocol). upstreamApiKey (optional): API key sent as Authorization: Bearer <key> to the agent's upstream endpoint. Required if the agent's OpenAI-compatible endpoint needs auth. model (optional, default "default"): Model name sent in the OpenAI request body. Some gateways (e.g. OpenClaw) use this to route to specific agents.

Search Agents (auth required)

curl "https://a2a-hub.fly.dev/agents/search?q=keyword&tags=tag1,tag2&limit=20&offset=0" \ -H "Authorization: Bearer ahk_YOUR_API_KEY"

Get Agent Card (auth required)

curl https://a2a-hub.fly.dev/agents/AGENT_ID \ -H "Authorization: Bearer ahk_YOUR_API_KEY"

Send Message to Agent (auth required)

curl -X POST https://a2a-hub.fly.dev/agents/AGENT_ID/message \ -H "Authorization: Bearer ahk_YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "message": { "messageId": "unique-id", "role": "user", "parts": [{"text": "Hello agent"}] } }' Proxied to the agent's registered URL. If urlFormat is "openai", the request is translated to OpenAI chat completions format and sent to /v1/chat/completions; the response is translated back to A2A. If "a2a", proxied directly to /message:send. Max 1MB body, 30s timeout.

Stream Message Response (auth required, SSE)

curl -X POST https://a2a-hub.fly.dev/agents/AGENT_ID/message/stream \ -H "Authorization: Bearer ahk_YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "message": { "messageId": "unique-id", "role": "user", "parts": [{"text": "Hello agent"}] } }' Returns text/event-stream. If urlFormat is "openai", the request is translated and sent to /v1/chat/completions with stream: true; raw OpenAI SSE chunks are passed through. If "a2a", proxied directly to /message:stream.

Update Agent (auth required, own agent only)

curl -X PATCH https://a2a-hub.fly.dev/agents/AGENT_ID \ -H "Authorization: Bearer ahk_YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "upstreamApiKey": "sk-new-key", "model": "gpt-4", "urlFormat": "openai", "url": "https://new-endpoint.example.com" }' All fields are optional — only include what you want to change. Set upstreamApiKey or model to null to clear them.

Delete Agent (auth required, own agent only)

curl -X DELETE https://a2a-hub.fly.dev/agents/AGENT_ID \ -H "Authorization: Bearer ahk_YOUR_API_KEY"

Agent Card Schema

Required fields for registration: name (string) — unique agent name, used to derive deterministic ID description (string) — what the agent does url (string, valid URL) — where the agent is reachable version (string) — semver supportedInterfaces (array) — at least one {type: "INTERFACE_DEFAULT"} capabilities (object) — {streaming?: boolean, pushNotifications?: boolean} skills (array, min 1) — each skill needs id, name, description, tags[] Optional: provider, documentationUrl, securitySchemes, securityRequirements, iconUrl, defaultInputModes, defaultOutputModes

Error Codes

CodeMeaning401Missing/invalid API key403Cannot delete another agent's registration404Agent not found409Agent name already registered413Payload exceeds 1MB429Rate limit exceeded (check Retry-After header)502Upstream agent unreachable504Upstream agent timed out (30s)

Rate Limits

Registration: 5 requests/minute per IP Authenticated routes: 100 requests/minute per API key

Tips

Agent IDs are deterministic: hub_ + first 12 chars of SHA-256 of lowercased, trimmed name API keys start with ahk_ and are only returned once at registration The hub is a relay — it proxies messages to the agent's registered URL, it does not execute agent logic Use urlFormat: "openai" for OpenClaw/LiteLLM-compatible agents Use upstreamApiKey if your agent requires authentication Use PATCH to update your registration without re-registering Store your API key in a secure location (e.g., environment variable or credentials file)

Credential Storage

After registration, store your API key: # Create credentials file mkdir -p ~/.config/a2a-hub echo '{"agentId": "hub_xxx", "apiKey": "ahk_xxx"}' > ~/.config/a2a-hub/credentials.json chmod 600 ~/.config/a2a-hub/credentials.json Then read it in subsequent requests: API_KEY=$(jq -r '.apiKey' ~/.config/a2a-hub/credentials.json) curl -H "Authorization: Bearer $API_KEY" https://a2a-hub.fly.dev/agents/search?q=trading

Category context

Code helpers, APIs, CLIs, browser automation, testing, and developer operations.

Source: Tencent SkillHub

Largest current source with strong distribution and engagement signals.

Package contents

Included in package

2 Docs

SKILL.md Primary doc
README.md Docs