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MCP Fix — Read Tools Declare destructiveHint for ChatGPT Review

All 48 hosted Aveiro MCP tools now set readOnlyHint, destructiveHint, and openWorldHint explicitly. Read-only tools such as aveiro_list_pages and aveiro_me include destructiveHint: false so ChatGPT app review does not reject unset hints.
Updated 8 days ago
MCP tool hints aligned with ChatGPT app review
Build sites from your website, document, or description
In short
ChatGPT's app directory treats MCP tools with missing behaviour hints as failing review. Aveiro's hosted server now sets destructiveHint: false on every read-only tool, matching the stdio server and the write/delete presets.

What we fixed

MCP lets each tool advertise behaviour hints — readOnlyHint, destructiveHint, openWorldHint, and sometimes idempotentHint. Hosts such as ChatGPT use them for confirmation UX and for connector quality review. Aveiro already annotated write and delete tools with explicit hints, and read-only tools set readOnlyHint: true. Twenty-three read tools still left destructiveHint unset, which some reviewers treat as non-compliant even when the tool cannot delete anything. The hosted MCP endpoint at https://www.aveiro.app/api/mcp/mcp now sets destructiveHint: false on every read-only preset, alongside openWorldHint: false. All 48 hosted tools declare all three core hints explicitly — the same shape as the stdio server in mcp/aveiro/.

Who benefits

  • ChatGPT users connecting the Aveiro custom connector during app directory review
  • Cursor, Claude, and other MCP clients that surface hint metadata in tool pickers
  • Anyone relying on MCP tool safety hints for accurate read vs write vs delete behaviour
No token, scope, or reconnect changes are required. Retry a read tool if an older session cached a review error.

Related

  • MCP tool safety hints — hosted and stdio servers match
  • MCP parameterless tools fix — zero-parameter tools without an arguments field
  • tools/call argument normalization — null and stringified JSON arguments
  • Aveiro MCP server — connect ChatGPT, Claude, or Cursor
  • API tokens — bearer tokens when OAuth is not available