A2A Agent Card · Moss

Moss

Real-time semantic search runtime for AI agents. Sub-10ms semantic, keyword, or hybrid retrieval against project-owned indexes, hosted or on-device. Supports bring-your-own embeddings.

Open the live agent card → Agent endpoint Moss provider profile
⚠ Agent card, not A2A. Moss serves a machine-readable agent manifest at the A2A discovery path, but it fails a structural check in the A2A 1.0.0 AgentCard object. It is an agent card in spirit rather than in schema — useful for discovery, but an A2A client cannot assume it will parse.
Provider: Moss Conformance: Flavored Protocol: 1.0.0 Transport: Version: 1.0.0 Host: moss.dev Skills: 3
Discovery

An A2A client finds this agent by fetching the well-known path on the provider's own host. That is what makes an agent card different from every other agent artifact in this catalog: it is provider-published by construction — it cannot be derived, generated, or reconstructed on a provider's behalf.

https://www.moss.dev/.well-known/agent-card.json
Interfaces
https://service.usemoss.dev/v1 · transport HTTP · protocol non-standard supportedInterfaces
Skills (3)

Semantic Search semantic-search

Sub-10ms similarity search against a project index. Tunable alpha blends pure semantic (1.0) and pure keyword/BM25 (0.0) retrieval. Supports top-k, metadata filters, and optional pre-computed query embeddings.

Index Management index-management

Create, load, list, and delete semantic search indexes. Built-in embedding models moss-minilm (fast, default) and moss-mediumlm (higher accuracy), or bring-your-own embeddings per document.

Document Operations document-operations

Add, upsert, retrieve, and delete documents within an index. Documents carry id, text, optional string-keyed metadata for filtering, and optional pre-computed embeddings.

Documentation
https://docs.moss.dev
Evidence. Fetched 2026-07-28 from https://www.moss.dev/.well-known/agent-card.json, HTTP 200. The body was saved verbatim and is the sole source for everything on this page — no field is inferred. View the captured card. Providers change what they serve; if this card has moved or changed shape, the provider profile carries the current state as of the last build.