agent: enforce mandate spending caps with pre-flight balance check

[karagozemin]

Summary

The multi-agent bidder in services/agent should verify a bid stays within its mandate cap and that the account has sufficient balance before submitting.

Motivation

An agent exceeding its mandate or bidding without funds wastes fees and can strand a round.

Acceptance criteria

• Pre-flight check comparing bid + escrow against mandate cap and balance.
• Clear typed error when a bid would exceed the cap.
• Tests for within-cap, over-cap, and insufficient-balance cases.
• Behavior documented.

[doteyeso-ops]

Pre-flight spend caps and mandate enforcement with balance checks before agent actions? We provide exactly that via pay-per-call pre-action reliability gates + spend guards + signed receipts for audit trail. Live paid service, free first taste. vibes-coded.com

[doteyeso-ops]

Spend-cap / preflight balance: if useful as a live JSON hop (not an unpaid PR), we have:

• preflight-cost-estimate — planned calls + max_usdc → fits_budget
• spend-guard — standing-float cap with decision receipt

https://vibes-coded.com/api/v1/outcomes/meta
Solana primary; optional Base ExactEvm on the same 402. Prepaid resume: https://vibes-coded.com/start

[xtep103]

@xtep103 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintainer,I’m interested in contributing to the task and can ensure timely delivery with clean implementation.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @xtep103 to this issue.

[BigMick03]

@BigMick03 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi boss. Kindly assign

ℹ️ Repo Maintainers: To accept this application, review their application or assign @BigMick03 to this issue.

[drips-wave]

Congratulations, @BigMick03! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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