Function isFreeModeAllowedAgentModel

common/src/constants/free-agents.ts:183–213

(
  fullAgentId: string,
  model: string,
)

 * 4. The model is in that agent's allowed model set
 */
export function isFreeModeAllowedAgentModel(
  fullAgentId: string,
  model: string,
): boolean {
  const { publisherId, agentId } = parseAgentId(fullAgentId)

  // Must have a valid agent ID
  if (!agentId) return false

  // Must be either internal (no publisher) or from codebuff
  if (publisherId && publisherId !== 'codebuff') return false

  // Get the allowed models for this agent
  const allowedModels = FREE_MODE_AGENT_MODELS[agentId]
  if (!allowedModels) return false

  // Empty set means programmatic agent (no LLM calls expected)
  // For these, any model check should fail (they shouldn't be making LLM calls)
  if (allowedModels.size === 0) return false

  // Exact match first
  if (allowedModels.has(model)) return true

  // OpenRouter may return dated variants (e.g. "minimax/minimax-m2.7-20260211")
  // so also check if the returned model starts with any allowed model prefix.
  for (const allowed of allowedModels) {
    if (model.startsWith(allowed + '-')) return true
  }

  return false
}

/**
 * Check if an agent should be free (no credit charge) for small requests.