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yoi/.yoi/tickets/00001KVHR3WSD/item.md

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title state created_at updated_at assignee readiness risk_flags queued_by queued_at
MCP: execute tools/call through ordinary Tool path queued 2026-06-20T05:30:04Z 2026-06-20T06:00:44Z null implementation_ready
mcp
tools-call
permission
history
bounded-output
workspace-panel 2026-06-20T05:59:04Z

Background

After MCP tools are registered through ToolRegistry, invoking a Yoi MCP-backed tool should call the server's tools/call and return a bounded ordinary Tool result. Permission denial must happen before sending a request to the MCP server.

Requirements

  • Route registered MCP tool invocation to MCP tools/call.
  • Apply existing PreToolCall / Tool permission path before MCP server call.
  • If permission is denied, do not send tools/call to the server.
  • Distinguish normal result, MCP isError: true, and JSON-RPC protocol error.
  • Serialize MCP result forms boundedly: content[], structuredContent, isError, _meta, and supported rich content summaries.
  • Store result through ordinary Tool result/history path.
  • Treat all content as untrusted.

Acceptance criteria

  • MCP mock tool returns normal result through ordinary Yoi Tool result.
  • MCP isError: true is represented distinctly from JSON-RPC protocol failure.
  • Permission denied call is not sent to the MCP server.
  • Oversize/rich results are bounded/truncated or rejected according to explicit policy.
  • Tool history shows ordinary tool call/result, not hidden context injection.
  • Tests cover normal result, isError, protocol error, permission denial, and output bounds.

Non-goals

  • resources/read or prompts/get.
  • list_changed notifications.
  • Sampling/elicitation.

Related work

  • Depends on 00001KVHR3WS6.
  • Objective: 00001KTR80WMN.