Function executeForkedSkill

src/tools/SkillTool/SkillTool.ts:122–289

* Executes a skill in a forked sub-agent context. * This runs the skill prompt in an isolated agent with its own token budget.

(
  command: Command & { type: 'prompt' },
  commandName: string,
  args: string | undefined,
  context: ToolUseContext,
  canUseTool: CanUseToolFn,
  parentMessage: AssistantMessage,
  onProgress?: ToolCallProgress<Progress>,
)

 * This runs the skill prompt in an isolated agent with its own token budget.
 */
async function executeForkedSkill(
  command: Command & { type: 'prompt' },
  commandName: string,
  args: string | undefined,
  context: ToolUseContext,
  canUseTool: CanUseToolFn,
  parentMessage: AssistantMessage,
  onProgress?: ToolCallProgress<Progress>,
): Promise<ToolResult<Output>> {
  const startTime = Date.now()
  const agentId = createAgentId()
  const isBuiltIn = builtInCommandNames().has(commandName)
  const isOfficialSkill = isOfficialMarketplaceSkill(command)
  const isBundled = command.source === 'bundled'
  const forkedSanitizedName =
    isBuiltIn || isBundled || isOfficialSkill ? commandName : 'custom'

  const wasDiscoveredField =
    feature('EXPERIMENTAL_SKILL_SEARCH') &&
    remoteSkillModules!.isSkillSearchEnabled()
      ? {
          was_discovered:
            context.discoveredSkillNames?.has(commandName) ?? false,
        }
      : {}
  const pluginMarketplace = command.pluginInfo
    ? parsePluginIdentifier(command.pluginInfo.repository).marketplace
    : undefined
  const queryDepth = context.queryTracking?.depth ?? 0
  const parentAgentId = getAgentContext()?.agentId
  logEvent('tengu_skill_tool_invocation', {
    command_name:
      forkedSanitizedName as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
    // _PROTO_skill_name routes to the privileged skill_name BQ column
    // (unredacted, all users); command_name stays in additional_metadata as
    // the redacted variant for general-access dashboards.
    _PROTO_skill_name:
      commandName as AnalyticsMetadata_I_VERIFIED_THIS_IS_PII_TAGGED,
    execution_context:
      'fork' as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
    invocation_trigger: (queryDepth > 0
      ? 'nested-skill'
      : 'claude-proactive') as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
    query_depth: queryDepth,
    ...(parentAgentId && {
      parent_agent_id:
        parentAgentId as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
    }),
    ...wasDiscoveredField,
    ...(process.env.USER_TYPE === 'ant' && {
      skill_name:
        commandName as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
      skill_source:
        command.source as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
      ...(command.loadedFrom && {
        skill_loaded_from:
          command.loadedFrom as AnalyticsMetadata_I_VERIFIED_THIS_IS_NOT_CODE_OR_FILEPATHS,
      }),