Manus agent calling paid Sume tools: cap spend per call
A Manus agent with a Sume API key can start paid generation. Tell it to send max_spend_usd, dry_run and an idempotency_key on every paid call. Why each matters.
A Manus agent connected to Sume with an API key can call paid tools, so put three rules in its instructions: send max_spend_usd on every paid call, preview with dry_run=true first, and always send a fresh idempotency_key. Sume's docs say max_spend_usd is optional and enforced only when you send it, so an agent that omits it has no per-call cap.
Manus adds the server under Settings > Integrations > Custom MCP Servers, per its docs. The Sume rules are from MCP tools and gates, Generation admission and Safe automation, read 2026-10-06.
What does each control do?
The table below lists each item as documented.
| Control | Required | Effect |
|---|---|---|
idempotency_key | Yes, on writes and paid calls | A retry returns the original job instead of billing twice |
dry_run=true | No | Previews the call without submitting |
max_spend_usd | No | Rejects a call that would exceed it, when sent |
generation_admission_preview | No | Shows whether generation would be admitted |
What goes in the agent instructions?
A text instruction is not a hard limit. For a hard ceiling on an unattended run, use Agent Completions, where generation_spend_cap_usd is required.
- Before any paid tool, read its contract with
tools_schema. - Run the call with
dry_run=trueand show the cost. - Send the real call with
max_spend_usdset to the amount you approved. - If a wait ends with
wait_slice_expired, wait again; never create the job again.
Sources
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