Costcontrols

One Claude Code MCP call fans out to paid workers while a shared cost capability blocks work beyond the 25 dollar limit

One Claude Code MCP call spent the whole agent budget

The Claude Code run had a $25 limit and made one MCP call. Hidden fan-out behind the server produced a $286.40 bill.

A Claude Code call to an MCP method labelled read only fans out into a paid warehouse query, stored export, webhook, and audit-state change before an effect contract gates the call

Claude Code called a read-only MCP tool 186 times. The bill said otherwise.

An MCP method labelled read only can still start paid queries, create exports, send webhooks, and change audit state. Control the effects, not the method name.

A timed-out Claude Code MCP request leaves a paid remote job running while a guarded retry looks up the operation and attaches to the existing job

Claude Code timed out, retried, and paid twice

A timed-out MCP call may still be running and charging your account. Give paid tool operations a stable ID, a spend ceiling, and a retry receipt before Claude Code tries again.