Claimable Postgres

Instant Postgres databases for local development, demos, prototyping, and test environments. No account required. Databases expire after 72 hours unless claimed to a Neon account.

Quick Start

CODEBLOCK0

Parse connection_string and claim_url from the JSON response. Write connection_string to the project's .env as DATABASE_URL.

For other methods (CLI, SDK, Vite plugin), see Which Method? below.

Which Method?

• - REST API: Returns structured JSON. No runtime dependency beyond curl. Preferred when the agent needs predictable output and error handling.
• CLI (npx neon-new@latest --yes): Provisions and writes .env in one command. Convenient when Node.js is available and the user wants a simple setup.
• SDK (neon-new/sdk): Scripts or programmatic provisioning in Node.js.
• Vite plugin (vite-plugin-neon-new): Auto-provisions on vite dev if DATABASE_URL is missing. Use when the user has a Vite project.
• Browser: User cannot run CLI or API. Direct to https://neon.new.

REST API

Base URL: INLINECODE12

Create a database

CODEBLOCK1

Parameter	Required	Description
INLINECODE13	Yes	Tracking tag that identifies who provisioned the database. Use "agent-skills" when provisioning through this skill.
INLINECODE15

No | Enable logical replication (default: false, cannot be disabled once enabled) |

The connection_string returned by the API is a pooled connection URL. For a direct (non-pooled) connection (e.g. Prisma migrations), remove -pooler from the hostname. The CLI writes both pooled and direct URLs automatically.

Response:

CODEBLOCK2

Check status

CODEBLOCK3

Returns the same response shape. Status transitions: UNCLAIMED -> CLAIMING -> CLAIMED. After the database is claimed, connection_string returns null.

Error responses

Condition	HTTP	Message
Missing or empty INLINECODE23	400	INLINECODE24
Invalid database ID

400 | Database not found | | Invalid JSON body | 500 | Failed to create the database. |

CLI

CODEBLOCK4

Provisions a database and writes the connection string to .env in one step. Always use @latest and --yes (skips interactive prompts that would stall the agent).

Pre-run Check

Check if DATABASE_URL (or the chosen key) already exists in the target .env. The CLI exits without provisioning if it finds the key.

If the key exists, offer the user three options:

1. 1. Remove or comment out the existing line, then rerun.
2. Use --env to write to a different file (e.g. --env .env.local).
3. Use --key to write under a different variable name.

Get confirmation before proceeding.

Options

Option	Alias	Description	Default
INLINECODE35	INLINECODE36	Skip prompts, use defaults	INLINECODE37
INLINECODE38

-e | .env file path | ./.env | | --key | -k | Connection string env var key | DATABASE_URL | | --prefix | -p | Prefix for generated public env vars | PUBLIC_ | | --seed | -s | Path to seed SQL file | none | | --logical-replication | -L | Enable logical replication | false | | --ref | -r | Referrer id (use agent-skills when provisioning through this skill) | none |

Alternative package managers: yarn dlx neon-new@latest, pnpm dlx neon-new@latest, bunx neon-new@latest, deno run -A neon-new@latest.

Output

The CLI writes to the target .env:

CODEBLOCK5

SDK

Use for scripts and programmatic provisioning flows.

CODEBLOCK6

Returns databaseUrl (pooled), databaseUrlDirect (direct, for migrations), claimUrl, and claimExpiresAt (Date object). The referrer parameter is required.

Vite Plugin

For Vite projects, vite-plugin-neon-new auto-provisions a database on vite dev if DATABASE_URL is missing. Install with npm install -D vite-plugin-neon-new. See the Claimable Postgres docs for configuration.

Agent Workflow

API path

1. 1. Confirm intent: If the request is ambiguous, confirm the user wants a temporary, no-signup database. Skip this if they explicitly asked for a quick or temporary database.
2. Provision: POST to https://neon.new/api/v1/database with {"ref": "agent-skills"}.
3. Parse response: Extract connection_string, claim_url, and expires_at from the JSON response.
4. Write .env: Write DATABASE_URL=<connection_string> to the project's .env (or the user's preferred file and key). Do not overwrite an existing key without confirmation.
5. Seed (if needed): If the user has a seed SQL file, run it against the new database:

   psql "$DATABASE_URL" -f seed.sql
   

1. 6. Report: Tell the user where the connection string was written, which key was used, and share the claim URL. Remind them: the database works now; claim within 72 hours to keep it permanently.
2. Optional: Offer a quick connection test (e.g. SELECT 1).

CLI path

1. 1. Check .env: Check the target .env for an existing DATABASE_URL (or chosen key). If present, do not run. Offer remove, --env, or --key and get confirmation.
2. Confirm intent: If the request is ambiguous, confirm the user wants a temporary, no-signup database. Skip this if they explicitly asked for a quick or temporary database.
3. Gather options: Use defaults unless context suggests otherwise (e.g., user mentions a custom env file, seed SQL, or logical replication).
4. Run: Execute with @latest --yes plus the confirmed options. Always use @latest to avoid stale cached versions. --yes skips interactive prompts that would stall the agent.

   npx neon-new@latest --yes --ref agent-skills --env .env.local --seed ./schema.sql
   

1. 5. Verify: Confirm the connection string was written to the intended file.
2. Report: Tell the user where the connection string was written, which key was used, and that a claim URL is in the env file. Remind them: the database works now; claim within 72 hours to keep it permanently.
3. Optional: Offer a quick connection test (e.g. SELECT 1).

Output Checklist

Always report:

• - Where the connection string was written (e.g. .env)
• Which variable key was used (DATABASE_URL or custom key)
• The claim URL (from .env or API response)
• That unclaimed databases are temporary (72 hours)

Claiming

Claiming is optional. The database works immediately without it. To optionally claim, the user opens the claim URL in a browser, where they sign in or create a Neon account to claim the database.

• - API/SDK: Give the user the claim_url from the create response.
• CLI: npx neon-new@latest claim reads the claim URL from .env and opens the browser automatically.

Users cannot claim into Vercel-linked orgs; they must choose another Neon org.

Defaults and Limits

Parameter	Value
Provider	AWS
Region

us-east-2 | | Postgres | 17 |

Region cannot be changed for claimable databases. Unclaimed databases have stricter quotas. Claiming resets limits to free plan defaults.

	Unclaimed	Claimed (Free plan)
Storage	100 MB	512 MB
Transfer

1 GB | ~5 GB |
| Branches | No | Yes |
| Expiration | 72 hours | None |

Auto-provisioning

If the agent needs a database to fulfill a task (e.g. "build me a todo app with a real database") and the user has not provided a connection string, provision one via the API and inform the user. Include the claim URL so they can keep it.

Safety and UX Notes

• - Do not overwrite existing env vars. Check first, then use --env or --key (CLI) or skip writing (API) to avoid conflicts.
• Ask before running destructive seed SQL (DROP, TRUNCATE, mass DELETE).
• For production workloads, recommend standard Neon provisioning instead of temporary claimable databases.
• If users need long-term persistence, instruct them to open the claim URL right away.
• After writing credentials to an .env file, check that it's covered by .gitignore. If not, warn the user. Do not modify .gitignore without confirmation.