Decide Runtime

Evaluate supplied facts against approved rules, then read or export account-owned decision records; authenticated business pilot, USD 10 per 1,000 completed records, with no external execution.

View on decide.fyi

Hosted MCP Server

npx add-mcp 'https://mcp-live.decide.fyi/developer-prepaid/v1/mcp'

Installs into Claude Code, Codex, Cursor and more

Documentation

One decision engine.Clear ways to use it.

Start with the Decision API. Choose an interface or a specialized service for your job. Your application still owns the action; MCP does not change that boundary.

The product owns the interface

MCP, REST, and SDK are ways to use a product. They do not decide who owns it. Decide has a general runtime and standalone services; Krafthaus adds optional workflows built on Decide.

Decide Runtime

Evaluate approved rules

The released paid MCP evaluates and saves account-owned decisions. The older private Decision API preview is a separate access contract, not the live onboarding path.

Decide Services

Check a specific domain

Standalone services with domain inputs, approved rules, and evidence. Policy Notaries is the existing family; its MCP and REST interfaces belong to Decide.

Krafthaus workflows

Take the next step

Intake, human review, integration, and execution handoff. Any workflow-specific API, MCP, or agent belongs to that application. Direct Decide calls do not require Krafthaus.

Choose by job, access and data ownership

Availability is explicit. Production API access, private MCP access, free test records and reference examples are not interchangeable.

Decision API

Check a proposed action against your approved rules and supplied facts; receive yes, no or review with a Decision Record.

Decide checks and records. Your application owns execution.

See API pricing and request production access. Sandbox units are not paid production credit.

Connection and data scope

Interfaces

REST, SDK

Authentication

Production API credentials in a server-side caller.

Data

Customer-supplied facts and versioned rules; tenant-scoped records.

Client support

Server-side HTTP callers and the JavaScript SDK; MCP access is listed separately.

Metadata reviewed

2026-10-05 · not a live availability or compatibility guarantee

Decide Runtime

Evaluate supplied facts against approved deterministic rules, save yes, no or review, and read or export your own decision records.

Evaluation saves a record and may debit its prepaid unit. Decide never executes the proposed external action.

USD 10 for 1,000 completed records including applicable tax. Reads and identical retries add no record debit; separate request limits apply. No subscription or automatic refill.

Connection and data scope

Interfaces

MCP

Authentication

OAuth with PKCE, your own business account and a separately approved evaluate/read allowance.

Data

Account-owned records. Supported business markets: EU27, UK and US; controlled 25-account pilot.

Client support

Compatible remote MCP clients. Installation, OAuth connection and owner spending allowance are separate steps; client-specific setup is below.

Metadata reviewed

2026-10-12 · not a live availability or compatibility guarantee

Legacy Decision API MCP preview

Let an enrolled MCP client evaluate approved rules, retrieve its own Decision Records and verify records.

May create decision records; does not execute downstream actions.

Preview access and applicable API pricing must be agreed separately.

Connection and data scope

Interfaces

MCP

Authentication

Tenant-scoped production identity and an explicit preview allowlist.

Data

Customer-owned records. Not the public policy lookup service.

Client support

Legacy enrolled API clients only. Separate from the released Decide Runtime OAuth endpoint.

Metadata reviewed

2026-10-05 · not a live availability or compatibility guarantee

Decide Policy Notaries

Look up source-backed refund, cancellation, return and trial terms for supported vendors.

Eligibility information is not permission to refund, cancel or change an account.

Public lookup access; current service limits apply. A lookup is not paid runtime usage.

Connection and data scope

Interfaces

MCP, REST

Authentication

No authentication required for the public MCP endpoint.

Data

Supported vendor policy evidence; no customer Decision Records are read or changed.

Client support

MCP clients supporting Streamable HTTP; one canonical server exposes four tools.

Metadata reviewed

2026-10-05 · not a live availability or compatibility guarantee

Decide Runtime — Free Sandbox

Try contextual examples or your own declarative rules, then read and retry the same saved record without consuming a second unit.

No live payment, production access or external action.

10 free test records on activation; a 30-minute key. Rotation does not reset the allowance.

Connection and data scope

Interfaces

Browser, REST

Authentication

Your own account, separate sandbox consent and separate test-key activation.

Data

Account-scoped test records. Use fictional data, not production customer information.

Client support

Hosted browser and downloadable Node.js trial client. Scoped sandbox MCP instructions are inside the trial; OAuth-only client compatibility is not claimed.

Metadata reviewed

2026-10-05 · not a live availability or compatibility guarantee

Try the free sandbox

Krafthaus workflow applications

Combine workflow intake, human review, integrations and execution handoff around a decision.

Workflow-specific APIs, MCPs and agents belong to the application, not the general engine.

App-specific terms. Krafthaus is optional for direct Decide integrations.

Connection and data scope

Interfaces

Application-specific

Authentication

Each application controls its own access and integrations.

Data

Workflow-specific data and connected systems; check the individual app's scope.

Client support

Consult the individual application. No universal Krafthaus MCP is implied.

Metadata reviewed

2026-10-05 · not a live availability or compatibility guarantee

Explore Krafthaus

SDK, verification and examples

Supporting resources, not additional live services or MCP servers.

JavaScript SDK

Integrate Decision API calls and local record verification using the published JavaScript package.

An integration library, not a separate hosted MCP server.

Open-source package; installing it does not grant free production API calls.

Connection and data scope

Interfaces

Node.js, CLI

Authentication

No account to install; hosted API calls need applicable credentials.

Data

Local code and supplied records; hosted calls follow their service's data boundary.

Client support

See SDK documentation for supported runtimes and package exports.

Metadata reviewed

2026-10-05 · not a live availability or compatibility guarantee

Read SDK setup

Decision Record verification

Inspect record verification material and learn how to check hashes and authenticity.

Verification is not a new approval or permission to execute an action.

Supporting verification resource, not an additional paid decision service.

Connection and data scope

Interfaces

Browser, SDK, CLI

Authentication

See the chosen verification surface; offline SDK checks need no hosted login.

Data

Only inspect records you are authorized to share; prefer offline checks for private data.

Client support

Hosted utility and documented SDK verification tools; not a new standalone MCP.

Metadata reviewed

2026-10-05 · not a live availability or compatibility guarantee

Rulebook examples and integration patterns

Explore discount, refund, agent action and CRM write-back examples before adapting your own approved rules.

Templates are not live services or separate MCP servers; your application must enforce its own boundary.

Free reference material; no production allowance or purchase is implied.

Connection and data scope

Interfaces

Documentation, Example code

Authentication

No account to read; running hosted calls requires the appropriate service access.

Data

Reference inputs, not trusted live facts or a deployed customer integration.

Client support

Adapt the documented pattern to your system and validate it before production.

Metadata reviewed

2026-10-05 · not a live availability or compatibility guarantee

Decide Directory: wider decision infrastructure

A curated directory of decision engines and the infrastructure around them. Authorization, workflow, discovery and testing tools are adjacent infrastructure, not necessarily deterministic verdict engines. This is not an exhaustive list of everything deterministic.

The Decide and Krafthaus offerings above are ours. The independent entries below belong to their own maintainers. This directory hosts references, not third-party execution, security certification or tested interoperability.

Decision and rules engines

GoRules ZEN

Owner source documents a business rules engine and JSON Decision Models.

No local benchmark or compatibility test performed.

Source reviewed 2026-10-05.

Read the primary source

Camunda DMN decision engine

Owner page describes DMN decision execution and process integration.

Deployment behavior and API compatibility were not tested.

Source reviewed 2026-10-05.

Read the primary source

Authorization and access decisions

Open Policy Agent

Owner documentation describes general-purpose Rego evaluation with structured inputs and outputs.

No engine installation, benchmark or comparison performed.

Source reviewed 2026-10-05.

Read the primary source

Cedar

Owner documentation covers authorization policies over principal, action, resource and context.

Authorization is adjacent to, not a replacement for, every business-rule decision.

Source reviewed 2026-10-05.

Read the primary source

Cerbos

Owner documentation describes contextual access decisions, PDP and related management components.

No agent/MCP integration or security audit was performed.

Source reviewed 2026-10-05.

Read the primary source

MCP and discovery infrastructure

MCP architecture

Official documentation distinguishes hosts, clients, servers, protocol and transport.

Current documentation resolves to a newer protocol than the legacy private Decide preview; no newest-version conformance claim.

Source reviewed 2026-10-05.

Read the primary source

Official MCP Registry

Official repository stores server metadata for downstream aggregation and discovery.

A listing does not certify server security or guarantee host adoption.

Source reviewed 2026-10-05.

Read the primary source

Smithery publishing

Owner documentation requires Streamable HTTP and OAuth for authenticated URL publishing.

Requirements can change; no submission was made in this task.

Source reviewed 2026-10-05.

Read the primary source

Workflow orchestration

Temporal

Owner documentation describes durable workflow execution and recovery.

No workflow executed; rules and authorization remain application concerns.

Source reviewed 2026-10-05.

Read the primary source

Models, logs and testing references

Decision Model and Notation

OMG publishes the normative decision modeling specification.

Standard support does not prove compatibility between particular products.

Source reviewed 2026-10-05.

Read the primary source

OPA decision logs

Owner documentation covers decision log collection and delivery.

Logs do not by themselves demonstrate signing, tamper-evidence or action completion.

Source reviewed 2026-10-05.

Read the primary source

The Decision infrastructure guide carries the same reviewed sources and contribution criteria. New entries need a real public product or standard, a primary source, a clear role and an explicit limitation; examples and planned MCPs are not live services.

Policy Notaries connection

Configure one canonical Streamable HTTP server. Specialist subdomains remain compatibility surfaces; new integrations should use the unified endpoint.

The four tools below belong to one service. Missing required facts or source confidence produce UNKNOWN, not approval.

{
  "mcpServers": {
    "decide-policy": {
      "url": "https://policy.decide.fyi/api/mcp"
    }
  }
}

https://policy.decide.fyi/api/mcp

Refund

refund_eligibility

Allowed, denied, or unknown.

Cancel

cancellation_penalty

Free cancel, penalty, locked, or unknown.

Return

return_eligibility

Returnable, expired, non-returnable, or unknown.

Trial

trial_terms

Trial available, no trial, or unknown.

Tool contracts MCP server card Agent card UCP manifest

Connect your agent

USD 10 for 1,000 completed decisions

The released prepaid MCP is separate from the earlier private-preview API contract below and the fictional Sandbox connectors. It evaluates supplied facts and approved rules, saves yes, no or review, and reads or exports your own records. It does not execute external actions.

USD 0.01 per completed record, including applicable tax. Reads and identical retries add no record debit; separate request limits apply. No subscription or automatic refill. Controlled 25-account business pilot: EU27, UK and US.

Sign in at the Runtime console, accept the current terms, and choose your own account spending cap.
Review Checkout for one pack. Returning from Checkout alone is not funding proof.
Add https://mcp-live.decide.fyi/developer-prepaid/v1/mcp in your compatible MCP client, authenticate with OAuth/PKCE, and separately approve its evaluate/read allowance in the console.

Tools: decide_prepaid_evaluate, decide_prepaid_get_record, decide_prepaid_export_record. Never put credentials into prompts or tool arguments. Connecting alone grants no budget.

One live endpoint

https://mcp-live.decide.fyi/developer-prepaid/v1/mcp

Use the same endpoint for evaluation, reading and export. Do not connect a qualification or Free Sandbox plugin when you intend to use paid credit.

ChatGPT and Codex

Add a custom remote MCP connection using the endpoint above. Review the client warning and OAuth consent yourself. Use the registered live client configuration if your client asks for an OAuth client ID; Sandbox client configuration is not interchangeable. A custom connection is not a public directory listing.

Name it Decide Runtime. Keep testing connections explicitly labelled Sandbox.

Claude

Add a custom connector with the same URL and follow the OAuth flow. Client-specific OAuth registration must be accepted before tools can load. An account, connection or successful login alone does not fund evaluation.

VS Code

Run MCP: Add Server, choose HTTP, enter the live endpoint and name it decide-runtime. Review trust and OAuth prompts. Official setup guide.

Cursor

Add a remote server in MCP settings using this configuration, then authenticate. This is connection configuration, not a guarantee that every client registration is already admitted.

{ "mcpServers": { "decide-runtime": { "url": "https://mcp-live.decide.fyi/developer-prepaid/v1/mcp" } } }

Official MCP guide.

Your first useful check

Ask: “Check this quote against the discount and margin rules I provide. Save the decision; do not update my CRM.” Supply the actual Rulebook facts/rules. Keep the returned operation ID and exact input for reads, exports and identical retries. Do not ask an agent to invent your business policy.

Connected, but a call is refused?

invalid_client: client registration or redirect configuration was not accepted. Do not change your spending budget or paste credentials into chat.
No active allowance: select that client in the console and review a separate evaluate/read allowance. Renewal does not refill prior spend.
No spendable credit: review saved funding, account cap and client allowance. The agent must not buy credit or raise caps for you.
429: stop automatic retries. Reads and discovery count toward request limits even though they do not debit another completed record.
no, review, missing facts or unavailable: do not execute the proposed action. Supply missing facts or use your own exception policy.

Full records are available for 90 days with export. Each purchase has 12 months to redeem; unused credit is refundable to the original payment. Terms · Privacy · Machine-readable offer

Legacy Decision API MCP preview

This older private API contract is not the released Decide Runtime above. Existing enrolled API integrations keep their original boundary; new paid Runtime customers should use Connect your agent. No private preview endpoint is published.

Boundary	Private-preview contract
Identity	Transport credentials map to a Decision API customer and tenant.
Authorization	Production access requires an explicit preview allowlist; cross-tenant records fail closed.
Tool arguments	Credentials never belong in prompts, tool arguments, or example payloads.
Discovery	No public endpoint, public directory submission, or broad authenticated-access claim during preview.
Access	Request API and preview access.

Machine-readable visibility

The public MCP directory publishes separate entries for live Decide Runtime and public read-only Policy Notaries. The legacy private API preview retains access metadata only, with no private endpoint leak.

This directory separates our products from independently reviewed infrastructure. The GitHub guide and machine-readable catalogue use the same ecosystem sources. Listings and llms.txt do not automatically connect an agent, grant access or authorize payment.

Decide MCP directory Public catalog API Static public catalog