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yoi/.yoi/tickets/00001KVHR3WS6/item.md

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title state created_at updated_at assignee readiness risk_flags queued_by queued_at
MCP: register server tools into ToolRegistry closed 2026-06-20T05:30:04Z 2026-06-20T08:46:32Z null implementation_ready
mcp
tools-list
tool-registry
schema
untrusted-metadata
workspace-panel 2026-06-20T05:58:58Z

Background

Once a configured MCP stdio server can initialize, Yoi should expose provider-discovered MCP tools as ordinary model-visible Yoi tools through the existing ToolRegistry path. Server-provided tool metadata and schemas are untrusted data.

This Ticket only registers tools discovered through tools/list at provider initialization / safe refresh boundaries. It does not implement tools/call execution and does not allow model-visible tool schema mutation during an active run.

Requirements

  • Call MCP tools/list after initialize where supported.
  • Handle pagination / bounded listing.
  • Normalize MCP tool names into stable namespaced Yoi tool names that include server namespace.
  • Validate/normalize tool descriptions and input schemas as untrusted metadata.
  • Reject invalid schemas, duplicate names, and collisions fail-closed with diagnostics.
  • Register provider-discovered tool contributions through pod::feature / normal ToolRegistry path; no private MCP bypass.
  • Keep model-visible tool schema run-stable; list_changed handling is a later safe-boundary refresh/diagnostic problem, not mid-run mutation.
  • Do not register resources/prompts in this Ticket.

Acceptance criteria

  • Provider-discovered MCP mock server tool appears as model-visible Yoi tool with stable namespaced name.
  • Invalid schema is rejected with bounded diagnostic.
  • Duplicate/colliding names are rejected fail-closed.
  • Server metadata cannot weaken Yoi instructions/scope/permissions.
  • No tools/call request is sent during registration.
  • Active-run model-visible schema is not mutated by this registration path.
  • Tests cover valid registration, pagination/bounds, invalid schema, duplicate/collision, untrusted metadata normalization, and run-stable schema behavior.

Non-goals

  • MCP tool execution.
  • Resources/prompts operations.
  • list_changed notifications.

Related work

  • Depends on 00001KVHR3WRY.
  • Objective: 00001KTR80WMN.