MCP Tool Contract Checklist Before Generating Tests
Author: Ashwin Kondapalli, Founder & CTO, LoopIQ Updated: October 9, 2026
Someone hits generate on MCP Rigor against a thin requirement. The package comes back able to list tools. The channel calls it “acceptance automation.” Weeks later go/no-go discovers acceptance coverage was never verified—only discovery smoke ran.
Before generating MCP Rigor acceptance tests, confirm an approved tool, resource, or prompt contract with inputs and expected behavior on the source requirement. If a sufficient contract is missing, generated fallback tests remain discovery-only (MCP Rigor help). Listing tools is not acceptance. Passing tests still do not authorize a release.
What is an MCP tool, resource, or prompt contract?
For MCP Rigor generation, a contract is the approved description of:
Which MCP tools, resources, or prompts are in scope
Input arguments and constraints
Expected behavior / assertions worthy of acceptance
Authorization boundaries (token must allow only needed resources/actions)
It sits on (or is linked from) the source requirement so generation has something stronger than “exercise the server.”
Without it, you can still smoke-test discovery—but you must label it as such (discovery vs acceptance).
What prerequisites should you check before you generate?
Use this as a go/no-generate gate for acceptance intent:
Correct organization and team selected — wrong context → wrong evidence linkage
MCP Rigor framework + hosted runner enabled (admin) — cannot generate/run otherwise
Source requirement identified — traceability to intent
Approved tool/resource/prompt contract included — avoids discovery-only fallback
Input arguments documented — assertions can be specific
Expected behavior written for humans — reviewers can approve/reject
Token/scopes planned (least privilege) — security + hosted auth constraints
Reviewer named for `.mcpr` approval — generate stays review-only until approved
Secrets plan: protected `MCP_URL` / `MCP_TOKEN` — no token paste in requirements/reports
Discovery vs acceptance intent labeled — prevents mis-claiming coverage
If items 4–6 fail, generate only explicitly labeled discovery smoke—or fix the contract first (writing reviewable .mcpr suites).
How this works in LoopIQ
Prerequisites: As in the checklist; see Generate and run MCP Rigor tests.
Sequence (conceptual):
Author/approve the MCP contract on the requirement.
Open Test Automation → MCP Rigor → select requirement with contract.
Generate review-only .mcpr package.
Human review: reject if fallback discovery-only when acceptance was required.
Approve → configure protected parameters → execute → link evidence.
Remember: successful run ≠ release certification (why passing MCP still blocks).
Approvals and outputs: Contract ownership + suite approval are human gates. Pricing: $4.99/user/month; credits may apply.
Illustrative contract gate (demo)
Label: Illustrative demo data. Not a customer result.
R-44 refund partial — tool contract approved with args + expected behavior → generate acceptance .mcpr
R-51 agent inventory — no contract → discovery smoke only, or block generate for acceptance
R-60 draft — contract draft, not approved → do not generate acceptance yet
FAQ: quick answers
What must be in place before generating acceptance tests? Approved tool/resource/prompt contract with args and expected behavior, correct team context, and a named reviewer.
What if the contract is incomplete? Fallbacks stay discovery-only; acceptance unverified.
Who owns the contract? MCP server/tool owners with the requirement owner; admins enable the framework.
Is listing tools enough for acceptance? No—that is discovery smoke.
See a requirement become reviewed tests and execution evidence
CTA: See a requirement become reviewed tests and execution evidence. Book: https://meet.brevo.com/ashwin-kondapalli.
Further reading: MCP Rigor help · Discovery vs acceptance · Writing .mcpr suites · Passing MCP still blocks release · Intent-based testing · Pricing.
General information for engineering, quality, release, and compliance leaders. Not legal, audit, or regulatory advice.