v0.6.0 - DeepSeek Responses API update

DeepSeek Responses API update

This release brings the MCP server up to date with DeepSeek's August 2026 V4 API surface and current supported MCP SDK v1 dependencies.

Added

• create_response for the native DeepSeek /responses API.
• Non-streaming and semantic streaming response handling.
• Structured Responses input, function tools, web-search tools, structured output, and reasoning effort controls.
• Chat Completions low reasoning effort and user_id support.
• Streamable HTTP integration coverage for both stateless and stateful modes.
• MCP_HTTP_ALLOWED_ORIGINS for explicit browser Origin allowlisting.

Fixed

• Stateless Streamable HTTP now creates a fresh MCP server and transport per request, as required by MCP SDK 1.30.
• Failed Responses results now return MCP tool errors with provider details and retryability hints.
• Structured response items and nested content parts validate required fields before reaching DeepSeek.
• Responses calls now honor DEEPSEEK_DEFAULT_MODEL when model is omitted.
• Browser preflight responses include current MCP protocol/session headers and reject unapproved origins.

Updated

• @modelcontextprotocol/sdk 1.30.0
• Zod 4.4.3
• Vitest 4.1.10
• Node type definitions 25.9.5
• Registry metadata, API notes, README, and local/remote smoke scripts

Verified

• Clean npm ci
• npm audit — 0 vulnerabilities
• npm run build
• npm test — 25 tests across 4 files
• Stateful and stateless Streamable HTTP behavior
• npm pack --dry-run --json
• server.json validation against the published MCP Registry schema
• Snyk PR security check
• Multi-round Codex review with all actionable findings resolved

The OCI image remains at 0.5.0; this repository does not contain an automated Docker publishing workflow.