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MCP Fix — Parameterless Tools Work Without an Arguments Field

ChatGPT and other MCP clients that omit arguments on no-parameter tools no longer get InvalidParams on aveiro_me, aveiro_list_sites, or aveiro_social_list_accounts.
Updated 20d ago
MCP Fix — tools/call Accepts null and Stringified Arguments
Multi-Aspect AI Media for Social Posts — Platform Crops in One Call
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In short
Some MCP clients skip the arguments field entirely when a tool has no parameters. Aveiro's hosted and stdio MCP servers now accept those calls instead of returning InvalidParams.

What we fixed

The Aveiro MCP server registers several parameterless tools — actions that need no input beyond your token:
  • aveiro_me — verify token, scopes, and allowed sites
  • aveiro_list_sites — list sites the token can access
  • aveiro_social_list_accounts — list connected Instagram/Threads accounts (social:write)
Some clients, including ChatGPT, send tool calls without an arguments field when a tool has no parameters. Our server previously registered an empty input schema for these tools, which made the MCP SDK reject those calls with InvalidParams. We removed the empty schema so the SDK advertises a compatible empty-object shape and invokes the handler correctly — whether the client sends {} or omits arguments entirely.

Who benefits

  • ChatGPT and other clients that omit arguments on zero-parameter tools
  • Cursor and Claude users calling aveiro_me during setup or health checks
  • Social agents listing accounts with aveiro_social_list_accounts before drafting posts
No token or scope changes are required. Reconnect or retry the tool call if you hit InvalidParams on an older session.

Related

  • MCP tools/call argument normalization — null, empty string, and JSON-string arguments
  • API tokens — create tokens and scopes for MCP
  • Social agents and API — social:write and aveiro_social_* tools
  • Social agent API and MCP — Phase 2 social drafting overview