mcp-client-capabilities
Provides a language-friendly distribution of a single curated JSON database (mcp-clients.json) listing MCP client names, metadata, and capability flags compatible with MCP client capability schemas. Intended for MCP servers to decide how to present resources/tools/prompts/instructions based on known client feature support.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
No authentication or data collection described; package serves static capability metadata. Main security considerations are supply-chain integrity (verify npm/pypi provenance) and treating the data as non-authoritative per runtime handshake. TLS is not directly applicable since no network API is described, but typical package download occurs over HTTPS.
⚡ Reliability
Best When
When you’re implementing MCP server logic and want a maintained reference table to complement/triage the official initialize handshake capabilities.
Avoid When
When you need real-time updates, authoritative per-instance capability negotiation beyond initialize, or an API with query/update endpoints.
Use Cases
- • MCP server capability-aware behavior (e.g., offer alternate tools or instructions based on client support)
- • Building UI/agents that need to understand which MCP client features are likely available
- • Offline validation/testing and code generation against a maintained client capability matrix
- • Cross-language consumption of client capability metadata (TS/Python) via packaged exports or raw JSON URL
Not For
- • A live registry or query service (the data is static JSON, not a network API)
- • Security authorization/token management between client and server
- • Guaranteeing actual runtime capability support of a specific client version (it’s a best-effort index, servers should rely on initialize params.capabilities)
Interface
Authentication
No authentication—package is a published data/library artifact.
Pricing
No pricing information indicated; appears to be free/open-source distribution.
Agent Metadata
Known Gotchas
- ⚠ This is not a network service; integration is via static JSON/library exports.
- ⚠ Servers should not treat the indexed capabilities as authoritative—README stresses prioritizing initialize.params.capabilities and ignoring out-of-date protocolVersion mismatches.
- ⚠ Capability fields are optional; code should handle missing properties (e.g., resources/prompts/tools might be absent).
Alternatives
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Scores are editorial opinions as of 2026-03-30.