finos-mcp-core

The shared safety layer for the finos-mcp servers (finos-mcp-aigf, finos-mcp-cdm, finos-mcp-fdc3): read-only MCP servers for FINOS data standards. You normally get it as a dependency of one of those rather than installing it directly.

Not affiliated with or endorsed by FINOS. This is an independent, community package. On PyPI the finos- prefix is also used by official FINOS packages such as finos-cdm; this is not one of them.

What it enforces

  • Read-only, no override. A tool can only be registered with readOnlyHint: true; the server refuses to serve tools/* if any tool lacks it.
  • Rate limits. Token bucket per client and tool; exhaustion is a JSON-RPC error (-32029, rate_limited) with retry_after_s.
  • Size caps. Oversized arguments are rejected before the tool runs (input_too_large); oversized results are replaced with output_too_large.
  • Structured errors. not_found, ambiguous_id (with candidates), invalid_input, validation_failed, unsupported_format.
  • Audit log. One JSON line per request to stderr or FINOS_MCP_AUDIT_PATH, with a sha256 of the arguments rather than the arguments themselves.

Policy can only be tightened from the environment (FINOS_MCP_MAX_INPUT_BYTES, FINOS_MCP_RATE_CALLS, FINOS_MCP_RATE_WINDOW_S, FINOS_MCP_RATE_BURST). The semantic extra adds hybrid BM25 + static-embedding search; without it, nothing makes a network call.

Docs: https://vardhjain.github.io/finos-mcp/ · Source: https://github.com/vardhjain/finos-mcp · Changelog: https://github.com/vardhjain/finos-mcp/blob/main/CHANGELOG.md

Licence

Code is Apache-2.0.

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Apache-2.0
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Requires

Python >=3.12

Provides Extra

semantic

Tags

agents finos llm mcp model-context-protocol

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