mcpb
Desktop Extensions: One-click local MCP server installation in desktop apps
by modelcontextprotocolTypeScript
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Last 12 weeks · 2 commits
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Active · Last activity 1w ago
See all on GitHub →Clarify the MCPB signature format in documentation The signature format documentation in https://github.com/modelcontextprotocol/mcpb/blob/main/CLI.md#signature-structure currently shows a simplified format that doesn't match the actual implementation. This PR corrects the documentation to accurately describe the binary signature structure. Motivation and Context The current documentation states that MCPB signatures use , but the actual implementation uses: A 4-byte little-endian length prefix before the signature DER-encoded (raw binary) signatures, not Base64 This discrepancy causes issues for developers implementing MCPB signing outside of the official CLI. For example, Microsoft is integrating MCPB signing with our enterprise signing service (ESRP), and we discovered the documentation didn't match the actual format expected by . The length prefix is essential because raw DER bytes could contain byte sequences that match , making parsing ambiguous without knowing the exact signature length. How Has This Been Tested? Verified by reading the source code in both the TypeScript implementation (/) and the C#/.NET implementation (/) Signed MCPB files using the correct format outside of the MCPB CLI and verified them with the CLI's command. Breaking Changes None. This is a documentation-only change that corrects the docs to match existing behavior. Types of changes [ ] Bug fix (non-breaking change which fixes an issue) [ ] New feature (non-breaking change which adds functionality) [ ] Breaking change (fix or feature that would cause existing functionality to change) [x] Documentation update Checklist [x] I have read the MCP Documentation [ ] My code follows the repository's style guidelines [ ] New and existing tests pass locally [ ] I have added appropriate error handling [x] I have added or updated documentation as needed Additional context Current documentation (incorrect): Proposed documentation (matches implementation):**
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Repository: modelcontextprotocol/mcpb. Description: Desktop Extensions: One-click local MCP server installation in desktop apps Stars: 1738, Forks: 164. Primary language: TypeScript. Languages: TypeScript (92.7%), JavaScript (7.3%). Latest release: v2.1.2 (2mo ago). Open PRs: 13, open issues: 74. Last activity: 1w ago. Community health: 87%. Top contributors: joan-anthropic, felixrieseberg, asklar, MarshallOfSound, domdomegg, himself65, bryan-anthropic, ddworken, guyru, tobinsouth and others.