Midplane (formerly Deekard) 
The former Deekard destination now redirects to Midplane, an access layer and MCP server that places parser-level controls, policy enforcement and auditing in front of PostgreSQL for AI agents. Teams should use least-privilege database roles, deny destructive queries by default, isolate environments, protect credentials, test policies, review logs and require human approval for production changes.
Starting price Free open source + paid plans
Tool Information
The former Deekard destination now redirects to Midplane, an access layer and MCP server that places parser-level controls, policy enforcement and auditing in front of PostgreSQL for AI agents. Teams should use least-privilege database roles, deny destructive queries by default, isolate environments, protect credentials, test policies, review logs and require human approval for production changes.
Use authorized, minimal inputs and grant integrations the least access required. Configure privacy, retention, sharing, brand, quality, accessibility, disclosure, export, moderation and spending controls. Test representative cases, verify generated facts, calculations, citations, code, translations, audio and visual details, preserve originals and version history, and retain accountable human approval before publication, hiring, customer contact, deployment or operational action.
Midplane offers a free open-source MIT-licensed core and a free start route, with optional paid hosted or organizational capabilities. Databases, queries, policies, users, audit retention, hosting, support and contract terms vary.
AI output can be inaccurate, biased, derivative, insecure, incomplete or misleading. Review consent, copyright, likeness, voice and commercial rights, training and retention terms, renewals, refunds, platform rules and applicable law. Hiring, research, analytics, translation, media, security and customer-facing workflows require qualified human review.
F.A.Q (3)
Pros and Cons
Pros
- Adds a policy-enforcement layer between AI agents and PostgreSQL
- Rejects disallowed SQL before it reaches the database
- Parses nested operations such as destructive statements inside CTEs
- Controls table access as deny; read; or read-and-write
- Masks sensitive columns before values leave PostgreSQL
- Records allowed and denied queries in an append-only audit trail
- Supports least-privilege scopes per agent
- Lets administrators revoke an agent in one action
- Works with any MCP-compatible client
- Lists compatibility with Cursor; Claude Code; and Codex
- Provides OAuth access through one cloud MCP endpoint
- Offers EU or US cloud data residency
- Isolates tenant keys and rows
- Can be self-hosted under an MIT-licensed open-source core
- Includes the policy engine; audit logging; and credential isolation on every cloud tier
- The free cloud plan needs no credit card and includes one project and one seat
Cons
- It currently focuses on PostgreSQL rather than a broad range of databases
- A misconfigured allow policy can still permit damaging queries
- Guardrails do not replace backups; transaction controls; or database permissions
- Cloud deployment introduces an additional service in the database access path
- Outages or latency in the access layer can affect agent workflows
- Teams must design and maintain table and column policies
- Free audit retention is limited to seven days
- The free tier is limited to one project and one owner seat
- The free tier provides only five machine tokens
- Pro is capped at ten projects and ten seats
- Pro and Team prices are not published and require contacting the company
- SSO and SAML are limited to the Team plan
- SSO is not included in the community self-hosted build
- Paid subscriptions auto-renew and are generally non-refundable
- The service is provided without guarantees of uninterrupted or error-free operation
- Security still depends on protecting database credentials; OAuth access; and the Midplane deployment
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- Check the currency, billing period, automatic renewal, usage limits and seats at checkout — prices and promotions change.
- App-store pricing can differ from website pricing by country, device and tax.
- Share only authorised data, and read the provider's encryption, retention and model-training terms first.
- AI output can be incomplete or wrong. Verify facts, citations, calculations and code before you publish or ship.
- Commercial usage rights vary by plan, provider terms and jurisdiction.
- None of these tools replaces a qualified professional for medical, legal or financial decisions.
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