mcp-server-neon: Skill for Claude Code

.agents/skills/claimable-postgres/SKILL.md

claimable-postgres is a skill for Claude Code, Codex from neondatabase/mcp-server-neon. It costs 123 tokens per session (2,987 once invoked), scanned A, original, MIT.

A way to create a temporary Postgres database, a SQL database server, through Claimable Postgres by Neon without first creating an account.

In plain words
What is it for?
Use it to obtain a temporary DATABASE_URL through the REST API, command line, or software development kit (SDK) and place it in a project's environment settings.
Why use it?
It provides a database connection for short-lived development work, demos, prototypes, or tests, with databases expiring after 72 hours unless claimed.

Skill for Claude CodeCodex ✓ vendor

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is neondatabase/mcp-server-neon's own configuration. It tells Claude Code and Codex how to work on mcp-server-neon itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mcp-server-neon configures →

About the project

neondatabase/mcp-server-neon is a remote Model Context Protocol server that connects AI assistants to Neon’s Postgres database management API. Users can manage databases, create projects and branches, run queries, and perform migrations through natural-language requests. The catalogue entries are instructions and skills for operating Neon through this server.

neondatabase/mcp-server-neon · 663 stars · on GitHub · mcp-server-neon-jet.vercel.app

Reuse

Borrowing it

Nothing to install: this file belongs to neondatabase/mcp-server-neon. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/neondatabase/mcp-server-neon/main/.agents/skills/claimable-postgres/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/neondatabase/mcp-server-neon

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for claimable-postgres

README.md
[![agentmods](https://agentmods.dev/badge/skills/neondatabase/mcp-server-neon/claimable-postgres/github.svg)](https://agentmods.dev/skills/neondatabase/mcp-server-neon/claimable-postgres)
Your own site
<a href="https://agentmods.dev/skills/neondatabase/mcp-server-neon/claimable-postgres"><img src="https://agentmods.dev/badge/skills/neondatabase/mcp-server-neon/claimable-postgres/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for claimable-postgres

Your own site · 80×15
<a href="https://agentmods.dev/skills/neondatabase/mcp-server-neon/claimable-postgres"><img src="https://agentmods.dev/badge/skills/neondatabase/mcp-server-neon/claimable-postgres.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 123 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,987 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 15 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Privilege Escalation · line 73
    Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
    Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
  • high Privilege Escalation · line 94
    Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
    Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
  • high Privilege Escalation · line 171
    Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
    Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
  • medium MCP Rug Pull · line 9
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium MCP Rug Pull · line 42
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium MCP Rug Pull · line 73
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium MCP Rug Pull · line 149
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium MCP Rug Pull · line 215
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium Agent Snooping · line 17
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
  • medium MCP Rug Pull · line 20
    npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
    Fix: Pin the version: npx @scope/[email protected]
  • medium Data Exfiltration · line 30
    Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.
    Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
  • medium Excessive Agency · line 58
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
  • medium Excessive Agency · line 94
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
  • medium Prompt Injection · line 108
    Large whitespace padding was detected (a block of blank lines or a long run of spaces). This can push injected instructions below or to the right of the visible area so a human reviewer never sees them while the agent still reads them. Manual review of the hidden content is recommended.
    Fix: Remove the large whitespace padding (blank-line blocks or long space runs) and review any content hidden below or to the right of it. Keep skill files compact and reviewable so no instructions can be
  • medium Excessive Agency · line 170
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00123 $0.02987
Opus 5.5 $0.00049 $0.01195
Sonnet 5.5 $0.00025 $0.00597
Haiku 4.5 $0.00012 $0.00299

Measured 2mo ago against content hash 73cf2e998172, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

claimable-postgres scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s -X POST "https://neon.new/api/v1/database" \
.agents/skills/claimable-postgres/SKILL.md · 260 lines

How it starts

The opening of the file, as written. The whole thing — 260 lines — stays where its author put it; the contents beside it link to each section on GitHub.

FIRST: Use the parent neon skill for a Neon overview, getting started with Neon, Neon development best practices, and more.

If the neon skill is not installed, fetch it from https://neon.com/docs/ai/skills/neon/SKILL.md or install it with:

npx skills add neondatabase/agent-skills --skill neon

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

curl -s -X POST "https://neon.new/api/v1/database" \
  -H "Content-Type: application/json" \
  -d '{"ref": "agent-skills"}'

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.

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.

Agent Workflow

API path

  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
    
  6. Report: Cover every item in the Output Checklist.
  7. Optional: Offer a quick connection test (e.g. SELECT 1).

Read the full file on GitHub · 260 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 260 lines · 123 tokens per session scan A 73cf2e998172

Subscribe to this mod's changes

claimable-postgres is a skill published in the GitHub repository neondatabase/mcp-server-neon (663 stars, last pushed yesterday), licensed MIT. It adds 123 tokens to every session and 2,987 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

claimable-postgres compared with skills from other repositories

claimable-postgres next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
claimable-postgresneondatabase/mcp-server-neonSkill663yesterdayMITA123Claude Code, Codex
alloydb-basicsgoogle/skillsSkill22kyesterdayApache-2.0A72Claude Code, Codex
postgresql-table-designwshobson/agentsSkill42kyesterdayMITA37Claude Code
db-repairgarrytan/gbrainSkill32ktodayMITA96Claude Code
volcengine-rds-postgresqlbytedance/agentkit-samplesSkill484todayApache-2.0A63Claude Code, Codex
dsqlawslabs/agent-pluginsSkill937yesterdayApache-2.0A246Claude Code
analyzing-insights-across-teamsPostHog/posthog-fossSkill728yesterdayMITA115Claude Code, Codex