Function isToolSearchEnabledOptimistic

src/utils/toolSearch.ts:270–320

()

let loggedOptimistic = false

export function isToolSearchEnabledOptimistic(): boolean {
  const mode = getToolSearchMode()
  if (mode === 'standard') {
    if (!loggedOptimistic) {
      loggedOptimistic = true
      logForDebugging(
        `[ToolSearch:optimistic] mode=${mode}, ENABLE_TOOL_SEARCH=${process.env.ENABLE_TOOL_SEARCH}, result=false`,
      )
    }
    return false
  }

  // tool_reference is a beta content type that third-party API gateways
  // (ANTHROPIC_BASE_URL proxies) typically don't support. When the provider
  // is 'firstParty' but the base URL points elsewhere, the proxy will reject
  // tool_reference blocks with a 400. Vertex/Bedrock/Foundry are unaffected —
  // they have their own endpoints and beta headers.
  // https://github.com/anthropics/claude-code/issues/30912
  //
  // HOWEVER: some proxies DO support tool_reference (LiteLLM passthrough,
  // Cloudflare AI Gateway, corp gateways that forward beta headers). The
  // blanket disable breaks defer_loading for those users — all MCP tools
  // loaded into main context instead of on-demand (gh-31936 / CC-457,
  // likely the real cause of CC-330 "v2.1.70 defer_loading regression").
  // This gate only applies when ENABLE_TOOL_SEARCH is unset/empty (default
  // behavior). Setting any non-empty value — 'true', 'auto', 'auto:N' —
  // means the user is explicitly configuring tool search and asserts their
  // setup supports it. The falsy check (rather than === undefined) aligns
  // with getToolSearchMode(), which also treats "" as unset.
  if (
    !process.env.ENABLE_TOOL_SEARCH &&
    getAPIProvider() === 'firstParty' &&
    !isFirstPartyAnthropicBaseUrl()
  ) {
    if (!loggedOptimistic) {
      loggedOptimistic = true
      logForDebugging(
        `[ToolSearch:optimistic] disabled: ANTHROPIC_BASE_URL=${process.env.ANTHROPIC_BASE_URL} is not a first-party Anthropic host. Set ENABLE_TOOL_SEARCH=true (or auto / auto:N) if your proxy forwards tool_reference blocks.`,
      )
    }
    return false
  }

  if (!loggedOptimistic) {
    loggedOptimistic = true
    logForDebugging(
      `[ToolSearch:optimistic] mode=${mode}, ENABLE_TOOL_SEARCH=${process.env.ENABLE_TOOL_SEARCH}, result=true`,
    )
  }
  return true
}

/**
 * Check if ToolSearchTool is available in the provided tools list.