Function truncateToolInputValue

src/services/analytics/metadata.ts:242–283

(value: unknown, depth = 0)

const TOOL_INPUT_MAX_DEPTH = 2

function truncateToolInputValue(value: unknown, depth = 0): unknown {
  if (typeof value === 'string') {
    if (value.length > TOOL_INPUT_STRING_TRUNCATE_AT) {
      return `${value.slice(0, TOOL_INPUT_STRING_TRUNCATE_TO)}…[${value.length} chars]`
    }
    return value
  }
  if (
    typeof value === 'number' ||
    typeof value === 'boolean' ||
    value === null ||
    value === undefined
  ) {
    return value
  }
  if (depth >= TOOL_INPUT_MAX_DEPTH) {
    return '<nested>'
  }
  if (Array.isArray(value)) {
    const mapped = value
      .slice(0, TOOL_INPUT_MAX_COLLECTION_ITEMS)
      .map(v => truncateToolInputValue(v, depth + 1))
    if (value.length > TOOL_INPUT_MAX_COLLECTION_ITEMS) {
      mapped.push(`…[${value.length} items]`)
    }
    return mapped
  }
  if (typeof value === 'object') {
    const entries = Object.entries(value as Record<string, unknown>)
      // Skip internal marker keys (e.g. _simulatedSedEdit re-introduced by
      // SedEditPermissionRequest) so they don't leak into telemetry.
      .filter(([k]) => !k.startsWith('_'))
    const mapped = entries
      .slice(0, TOOL_INPUT_MAX_COLLECTION_ITEMS)
      .map(([k, v]) => [k, truncateToolInputValue(v, depth + 1)])
    if (entries.length > TOOL_INPUT_MAX_COLLECTION_ITEMS) {
      mapped.push(['…', `${entries.length} keys`])
    }
    return Object.fromEntries(mapped)
  }
  return String(value)
}

/**
 * Serialize a tool's input arguments for the OTel tool_result event.