Issues · modelcontextprotocol/typescript-sdk · GitHub

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requestId 0 is silently dropped by _oncancel, making the first request from every Protocol uncancellable

#2115

· feldmannn opened

on May 17, 2026

docs(README): `@modelcontextprotocol/fastify` missing from middleware listing

#2112

· sceran opened

on May 16, 2026

Streamable HTTP server accepts mismatched `MCP-Protocol-Version` header and body `protocolVersion` on `initialize`

#2108

· cclabadmin opened

on May 16, 2026

Is there a way to pass request-scoped context to tool handlers via HTTP headers without modifying the tool schema?

#2101

· joaquinmagneres-asana opened

on May 15, 2026

Tool inputSchema generation emits $ref for reused Zod instances · breaks strict MCP clients (kimi)

#2100

· daveCode-dot opened

on May 15, 2026

StreamableHTTPClientTransport: 2-retry SSE reconnect ceiling + silent-success after exhaustion

#2098

· cloudingenium-automation opened

on May 15, 2026

v2 alpha: @modelcontextprotocol/server has @cfworker/json-schema as optional peer but imports it unconditionally

#2093

· thkim-us opened

on May 15, 2026

Stateless mode: per-request McpServer+Protocol allocation causes memory leak at scale

#2090

· RomKadria opened

on May 14, 2026

[SEP-1613 regression] tools/list still emits draft-07 in 1.29.0 — `target` option missing from mcp.js `toJsonSchemaCompat` calls

#2084

· rsalus opened

on May 14, 2026

Type inconsistency: StreamableHTTPServerTransport.onclose widens Transport interface contract under exactOptionalPropertyTypes

#2083

· swadel opened

on May 13, 2026

Security scan results for typescript-sdk — MCPSafe AIVSS 53/100 (Grade F)

#2078

· mcpsafe-gh opened

on May 12, 2026

client code can't execute inside browser due to import spawn

#2077

· scastria opened

on May 12, 2026