AgentsKit Chat 0.2.0

0.2.0 is the trusted-backend release for ecosystem dogfooding. It keeps the same framework-neutral chat definition and seven native renderers from 0.1.0 while adding a production boundary for requests that cannot be answered by a host's deterministic artifact.

What changed

• The browser sends only a runtime-validated Ask request and resumable session cursor. Authentication determines the trusted site, corpus, and persona.
• Exact facts stay local through the deterministic answer plane. Only a validated escalation may reach the backend.
• Hosts inject AgentsKit RAG retrieval and model generation. Local and federated sources use the same grounded citation contract.
• CAS persistence prevents concurrent turns and cursor rollback. Deadlines, cancellation, rate limits, safe diagnostics, and request IDs are mandatory.
• Metrics include latency, event counts, retrieval, persistence, token usage, and cost without prompts, answers, source content, subjects, or session IDs.
• The shared Ask adapter recognizes valid NDJSON even when an intermediary incorrectly labels it as text/plain; ordinary text keeps its safe fallback.

Upgrade

Keep the fixed package group on one minor line:

{
  "dependencies": {
    "@agentskit/chat": "^0.2.0",
    "@agentskit/chat-protocol": "^0.2.0",
    "@agentskit/chat-react": "^0.2.0",
    "@agentskit/chat-server": "^0.2.0"
  }
}

Existing 0.1.x chat definitions remain source-compatible. Upgrade the fixed package graph together and follow the 0.2 migration guide.

See the backend guide, Ask protocol, and ADR-0026 for integration and security details.

Evidence

The release gate builds and clean-installs all 12 packages, exercises all seven renderers, runs browser and terminal E2E, validates Doc Bridge output, and verifies the immutable tarball checksums before publication.