feat(mcp): add agent onboarding tools - #58
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📝 WalkthroughWalkthroughThe MCP package adds plan listing and checkout-session creation and retrieval. It adds dashboard API error handling, Zod input and output schemas, tool registration metadata, documentation, and onboarding tests. ChangesOnboarding tools
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant MCPClient
participant checkoutCreate
participant createCheckoutSession
participant DashboardAPI
MCPClient->>checkoutCreate: submit email, planId, label
checkoutCreate->>createCheckoutSession: pass validated input
createCheckoutSession->>DashboardAPI: POST checkout session with idempotency key
DashboardAPI-->>createCheckoutSession: return session or API error
createCheckoutSession-->>checkoutCreate: return session or structured error
checkoutCreate-->>MCPClient: return structuredContent
Merge Risk: 🔵 Low · up to Expired checkout sessions may be polled indefinitely instead of prompting the user to restart onboarding. Update the guidance before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In `@packages/mcp/README.md`:
- Line 148: Update the `microlink_get_checkout_session` instruction to stop
polling when the onboarding state is either `ready` or the terminal `expired`
state, while preserving the existing behavior of storing `awsKeyId` only after
`ready`.
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📒 Files selected for processing (11)
packages/mcp/README.mdpackages/mcp/src/dashboard-client.jspackages/mcp/src/microlink-client.jspackages/mcp/src/output-schemas.jspackages/mcp/src/schemas.jspackages/mcp/src/tools/create-checkout-session.jspackages/mcp/src/tools/get-checkout-session.jspackages/mcp/src/tools/index.jspackages/mcp/src/tools/list-plans.jspackages/mcp/src/tools/register.jspackages/mcp/test/onboarding-tools.test.js
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Agents were told to store keyId as a credential; it is only a non-secret handle. Secret material stays on email/dashboard. Co-authored-by: Cursor <cursoragent@cursor.com>
URL tools wrap the library; checkout tools return dashboard payloads. Co-authored-by: Cursor <cursoragent@cursor.com>
2 participants
Goal
Expose the public dashboard Checkout endpoints as MCP tools so an agent can discover a plan, send the human through Stripe Checkout, and confirm provisioning when
keyIdis ready.Design
registerpath,structuredContent.dataenvelope, MCPoutputSchema, titles, and standard annotations.Idempotency-Keyfor the first logical create call, returns it, and accepts it on retries. The dashboard forwards it to Stripe for the 24-hour deduplication window.checkoutUrlto the human → poll status untilreadyorexpired.open | expired | paid | ready,subscriptionId, andkeyId.Important: what
keyIdiskeyIdis a non-secret handle for the provisioned API key (Stripe item metadata). These tools never return the API key secret. The human receives the secret via welcome email or the dashboard. Do not treatkeyIdasMICROLINK_API_KEY.Tool contracts
microlink_list_plansInput:
{}Output:
{ plans: Array<{ id, limit, price, currency }> }microlink_create_checkout_sessionInput:
{ email, planId, label? = "default", idempotencyKey? }Output:
{ sessionId, checkoutUrl, idempotencyKey }checkoutUrlmust be given to the human. The agent must not complete payment for them.microlink_get_checkout_sessionInput:
{ sessionId }Output:
{ state, sessionId, email, planId, sessionStatus, paymentStatus, subscriptionId, keyId }readymeans provisioning finished andkeyIdis present. The API secret is not included.Error taxonomy
Errors stay in MCP
isErrortext content so strict clients do not reject them against success-only output schemas.Unknown plan example:
{ "message": "Unknown planId `starter`.", "reason": "unknown_plan", "statusCode": 400, "availablePlans": [{ "id": "...", "limit": 45500, "price": 3900, "currency": "eur" }], "idempotencyKey": "...", "hint": "Choose an `id` from `availablePlans` and call this tool again with that `planId` and the same `idempotencyKey`." }Unknown session errors explain that the exact create result must be used. Other dashboard failures carry
reason,statusCode, and a correction-first retry hint; create failures also return the idempotency key to reuse.How to verify
Note
Medium Risk
Introduces billing-adjacent flows (checkout session creation, customer email) against production dashboard APIs, though idempotency and explicit non-return of API secrets limit duplicate charges and credential leakage.
Overview
Adds three MCP onboarding tools that wrap the public Microlink dashboard Checkout API so agents can guide a human through subscription signup:
microlink_list_plans,microlink_create_checkout_session, andmicrolink_get_checkout_session.A new
dashboard-client.jshandlesGET /api/v1/plans,POST /api/v1/checkout/sessions(withIdempotency-Key/ returnedidempotencyKeyfor safe retries), and session status polling. Checkout create is registered withINTERACTIVE_ANNOTATIONS(readOnlyHint: false); list and status stay read-only.asErrorResultnow preferserror.payloadso structured dashboard errors (unknown_plan,unknown_checkout_session, hints,availablePlans) surface correctly in MCP error responses.Input/output Zod schemas and README docs distinguish URL-processing tools from onboarding tools;
readyresponses exposekeyIdonly (not the API secret).onboarding-tools.test.jscovers fetch wiring, idempotency, and error recovery.Reviewed by Cursor Bugbot for commit b00e128. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation