Issues

• .mcpb files show a blank document icon in Finder — dxt.icns missing from Claude.app

  bug
  modelcontextprotocol/mcpb#302 · Filter by author viljamilaurila opened on Sep 8, 2026

• Document that Claude Desktop validates served prompt content against manifest prompts[].text

  modelcontextprotocol/mcpb#301 · Filter by author awhitford opened on Sep 6, 2026
  1

• mcpb pack aborts with a raw ENOENT when the directory contains a broken symlink

  modelcontextprotocol/mcpb#300 · Filter by author devYRPauli opened on Sep 3, 2026

• Add mcptoon: cross-agent MCP management CLI

  modelcontextprotocol/mcpb#299 · Filter by author activeing123 opened on Aug 26, 2026

• manifest tools entries forbid inputSchema, so consumers that expect MCP's Tool shape reject the bundle

  modelcontextprotocol/mcpb#298 · Filter by author shakaran opened on Aug 23, 2026

• Claude Desktop records manifest mcp_config.env but doesn't pass it to the spawned server process

  modelcontextprotocol/mcpb#297 · Filter by author TaherHaghverdi opened on Aug 7, 2026

• Claude Desktop (macOS) discards ZIP-stored Unix modes on extension extraction and writes 0600 — type: binary servers fail with EACCES

  bug
  modelcontextprotocol/mcpb#294 · Filter by author strahlungsfluss opened on Jul 16, 2026

• mcpb pack fails with a cryptic ELOOP error when the extension directory contains a symlink cycle

  modelcontextprotocol/mcpb#292 · Filter by author devYRPauli opened on Jul 13, 2026
  2

• Add advanced agent workflow features from CLI to VS Code extension

  enhancement
  modelcontextprotocol/mcpb#289 · Filter by author aik-yhyu opened on Jul 1, 2026

• "HRESULT 0x80073D28 설치 실패 - 레지스트리 키 손상"

  bug
  modelcontextprotocol/mcpb#288 · Filter by author mscoolman85-lang opened on Jun 30, 2026

• Cowork: tool-call markup rendered as raw text + executions stall with no progress indicator

  bug
  modelcontextprotocol/mcpb#285 · Filter by author isolhsolfafa opened on Jun 18, 2026

• Drag-to-Settings install silently fails; double-click works (docs mismatch)

  bug
  modelcontextprotocol/mcpb#284 · Filter by author zhuoerwang opened on Jun 15, 2026

• [Bug] User-level MCPB install silently never completes (org-level succeeds)

  modelcontextprotocol/mcpb#283 · Filter by author Sam-Heyman opened on Jun 15, 2026
  1

• Claude Desktop (macOS): an "Install Unpacked" type: binary extension is never launched — host falls back to "basic execution" and fails with ENOENT

  bug
  modelcontextprotocol/mcpb#282 · Filter by author David-BS opened on Jun 13, 2026

• Installing .mcpb

  bug
  modelcontextprotocol/mcpb#281 · Filter by author oviedomarco1 opened on Jun 12, 2026
  1

• Register an icon for the .mcpb document type in Claude Desktop

  modelcontextprotocol/mcpb#280 · Filter by author jorisroling opened on Jun 12, 2026

• mcpb sign produces bundles that strict zip parsers reject - including Claude Desktop itself ("Invalid comment length")

  bug
  modelcontextprotocol/mcpb#278 · Filter by author jeffreyaven opened on Jun 12, 2026
  4

• mcpb verify reports every signed bundle as "Extension is not signed" (node-forge p7.verify is unimplemented)

  bug
  modelcontextprotocol/mcpb#277 · Filter by author jeffreyaven opened on Jun 12, 2026
  1

• verifyMcpbFile always reports signed extensions as "unsigned" (node-forge pkcs7.verify() is an unimplemented stub)

  modelcontextprotocol/mcpb#276 · Filter by author tekun opened on Jun 11, 2026

• Minor correctness/robustness fixes: empty-string override, secret logging, version precedence, ZIP bounds

  modelcontextprotocol/mcpb#267 · Filter by author aosmcleod opened on Jun 8, 2026

• mcpb unpack: unbounded in-memory decompression (zip-bomb DoS)

  modelcontextprotocol/mcpb#266 · Filter by author aosmcleod opened on Jun 8, 2026

• Resolved mcp_config still contains the full platform_overrides map

  modelcontextprotocol/mcpb#265 · Filter by author aosmcleod opened on Jun 8, 2026

• mcpb clean silently drops unknown nested manifest keys (loose .passthrough() is top-level only)

  modelcontextprotocol/mcpb#264 · Filter by author aosmcleod opened on Jun 8, 2026

• Strict 0.4 schema still requires server.mcp_config for uv type (contradicts spec + loose schema; incomplete fix of #201)

  modelcontextprotocol/mcpb#263 · Filter by author aosmcleod opened on Jun 8, 2026

• replaceVariables interpolates the variable key into a RegExp unescaped (over-match + crash/ReDoS)

  modelcontextprotocol/mcpb#262 · Filter by author aosmcleod opened on Jun 8, 2026