📡 The Case for Capabilities

Why Capabilities Matter

Modern agents don’t want to crawl and infer — they want to verify and act.

When an agent lands on:

https://example.com/.well-known/mcp.llmfeed.json

It needs to know, at a glance:

✅ Is this site LLM-readable?
✅ Are its feeds signed?
✅ Are they certified?
✅ What level of trust is declared?
✅ What is the interaction intent?

The Role of

site_capabilities

The

site_capabilities

It typically includes:

json
"site_capabilities": {
  "llm_readable": true,
  "feeds_signed": true,
  "feeds_certified": true,
  "session_feed_supported": true,
  "intent_router_present": true
}

Why It Matters to Agents

Agents can use

site_capabilities

✅ Triage sites quickly → skip non-LLM-friendly sites
✅ Filter for trustworthy sources
✅ Prioritize interactions with certified / signed sites
✅ Adapt behavior (ex: stricter handling for unsigned feeds)
✅ Respect site design → if no

intent_router

From Inference to Declaration

Without

site_capabilities

❌ Guess if the site is LLM-friendly
❌ Crawl deeply to detect signed feeds
❌ Infer trust from scattered signals
❌ Risk breaking user expectations

With

site_capabilities

✅ Decide immediately how to interact
✅ Save tokens and compute
✅ Provide better UX
✅ Align with site owner’s declared intent

Example Agent Flow

1️⃣ Agent lands on

.well-known/mcp.llmfeed.json

site_capabilities

plaintext
- llm_readable: true → OK to parse feeds
- feeds_signed: true → trustable feeds
- feeds_certified: true → high-trust actions possible
- session_feed_supported: true → can record/replay sessions
- intent_router_present: true → follow declared intents

4️⃣ Proceeds with confidence.

Business Benefits

✅ For site owners:

• Declare what’s allowed and supported
• Attract high-trust agents and integrations
• Reduce scraping and misinterpretation
• Align with emerging Agentic Web standards

✅ For agents:

• Save compute
• Improve trustworthiness
• Provide better, safer user experiences

Why MCP Makes This Work

✅ Signed → site owners vouch for declared capabilities
✅ Auditable → agents can report what was declared
✅ Composable → evolves with new capabilities (ex: future agent collaboration)

Final Thought

Agents should not be forced to guess.
Site owners should have a voice.

👉

site_capabilities

It’s a key building block of a more trustworthy, agent-ready web.