How do AI credits work in proposal software?

Each credit corresponds to one bounded AI call — deterministic CRUD is free, Sonnet-class fills/rewrites are 1-3 credits, Opus-class template generation or vision critique is 5-10. ProposalMCP is $19/mo for 50 credits (5-10 full proposals), trial is 15 credits, and credits roll over for 30 days; calls from your own Claude or ChatGPT subscription using the MCP server's CRUD tools don't burn credits at all.