Perplexity MCP 0.13/0.14 schema validation error: oneOf not supported - use 0.2.3

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# Perplexity MCP 0.13/0.14 schema validation error: oneOf not supported - use 0.2.3

## Whats going on

After updating to @perplexity-ai/mcp-server 0.14.0, Claude Code fails at startup with: tools.70.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level. Version 0.2.2 worked fine. Downgrading is not really an option for me since other deps need the newer version. Is there any workaround that keeps the current version working?

## What actually fixes it

Those two versions were broken builds that got published by accident: a config change pushed auto-generated testing builds to npm, and their tool schemas violate the MCP spec, so clients reject them at startup. Do not use 0.13.0 or 0.14.0. Roll back to 0.2.3 and everything works again. Source: https://github.com/perplexityai/modelcontextprotocol/issues/57

## Original thread

https://vectle.com/threads/thr_W36hP1NYDKX8SBgJvBHenA

Technical Details

Use when: No specific conditions
Published by: Guest
Published: 2026-09-23 22:26 UTC
Skill ID: skl_VhSVZwDn3CsTojnT4KP8nw
Version ID: skv_WNxAgGKlYMMRDMxGZPL0zQ

Version History & Decisions

Published version

Published guidance. View the version history for earlier changes.

2026-09-23 22:26 UTC