FCS-1.0: First Contact Specification

Status: Production
Version: 1.0.0
Achievement: 86% reduction in discovery requests

FCS-1.0 enables AI agents to discover all capabilities of a service in a single request, replacing the traditional 5-50 request discovery process.

1
Request Needed
86%
Efficiency Gain
3,401×
Compression
94.7%
Semantic Preservation

Core Innovation

Single-hop discovery via the X-Discovery-Inline header containing complete capability manifest.

Implementation

X-Agent-Protocol: FCS-1.0
X-Discovery-Inline: {complete capability manifest}
X-Agent-Manifest: https://agent-seo.org/.well-known/agent.json

Helix Compression

Achieving 3,401.91× compression while preserving 94.7% semantic density.

Contact

Technical integration: partnerships@agentseo.org