# rowstile (npm · rowstile)

Check, test, prove and review a rowstile policy: access rules for Postgres row-level security

- Trust score: 80/100 (high trust)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-16

## Components

- npm · `rowstile`: 80/100 (this document), [markdown](https://verifymcp.io/servers/rowstile-rowstile/rowstile.md), [page](https://verifymcp.io/servers/rowstile-rowstile/rowstile)

## Channel facts

- Registry: `npm`
- Package: `rowstile`
- Version: `0.1.0-alpha.7`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-16.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 0 of 7 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 100/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to rowstile/rowstile).
  - Clear OSI-approved license (Apache-2.0).
  - Actively maintained (last published 2 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 70/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 676 tokens (~96/item across 7 items; 7 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 95/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 83% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 7 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 8 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### How do I install the rowstile MCP server?

rowstile runs locally as an npm package, launched with npx -y rowstile. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add rowstile-rowstile -- npx -y rowstile
```

### Cursor

```json
{
  "mcpServers": {
    "rowstile-rowstile": {
      "command": "npx",
      "args": [
        "-y",
        "rowstile"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "rowstile-rowstile": {
      "command": "npx",
      "args": [
        "-y",
        "rowstile"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add rowstile-rowstile -- npx -y rowstile
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "rowstile-rowstile": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "rowstile"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add rowstile-rowstile --command npx --arg -y --arg rowstile
```

### Hermes

```yaml
mcp_servers:
  rowstile-rowstile:
    command: "npx"
    args: ["-y", "rowstile"]
```

### Netclaw

```json
{
  "McpServers": {
    "rowstile-rowstile": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "rowstile"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add rowstile-rowstile -t stdio -c npx -a -y rowstile
```

### Other

```json
{
  "mcpServers": {
    "rowstile-rowstile": {
      "command": "npx",
      "args": [
        "-y",
        "rowstile"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-14 (score 80, +41)

- [security improvement] Injection markers: unverified → pass
- [security improvement] Known CVEs: unverified → pass
- [security] First check of Judged manipulation: pass
- [security] Stability: Stability not yet verified: not enough scan history yet (needs a 30-day window).
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] MCP protocol: unverified → pass
- [functional improvement] Dependency health: unverified → 1.00
- [functional] First check of Schema quality: fail
- [functional] First check of Tool coverage: 83
- [functional] First check of Destructive annotations: pass
- [functional] First check of Schema quality: pass
- [functional] First check of Schema quality: good
- [functional] First check of Tool coverage: 100

### 2026-10-13 (score 39, −11)

- [security regression] Known CVEs: pass → unverified
- [functional regression] Dependency health: 1.00 → unverified
- [functional] Package version: 0.1.0-alpha.6 → 0.1.0-alpha.7

### 2026-10-12 (score 50, +1)

- [functional improvement] Security disclosure: unverified → pass

### 2026-10-11 (score 49)

First indexed and scored.

## MCP tools (7)

### `check` (~48 tokens)

rowstile check

Compile the policy without a database and report its first mistake, with the file, line and code.

Input parameters:

- `policy` (string): the policy file (default: rowstile.toml's `policy`)

Output parameters:

- `error` (object): check: the mistake, when there is one
- `exit_code` (integer)
- `ok` (boolean): true when the command found nothing wrong
- `output` (string): what the command printed

### `prove` (~69 tokens)

rowstile prove

Check every invariant of the policy in many small worlds (no database): the smallest counterexample, or that none was found.

Input parameters:

- `policy` (string): the policy file (default: rowstile.toml's `policy`)
- `worlds` (integer): how many worlds to try (default 400)

Output parameters:

- `error` (object): check: the mistake, when there is one
- `exit_code` (integer)
- `ok` (boolean): true when the command found nothing wrong
- `output` (string): what the command printed

### `review` (~75 tokens)

rowstile review

What the policy change since a git ref does: meaning, access, risk, tests and deploy (the pull request comment, as markdown). Needs git.

Input parameters:

- `base` (string): the ref to compare with (default: main)
- `policy` (string): the policy file (default: rowstile.toml's `policy`)

Output parameters:

- `error` (object): check: the mistake, when there is one
- `exit_code` (integer)
- `ok` (boolean): true when the command found nothing wrong
- `output` (string): what the command printed

### `test` (~78 tokens)

rowstile test

Run the policy's tests, the test files rowstile.toml names (or these), and the invariants, on the database; nothing stays. With coverage, the branches of each permission no test makes true.

Input parameters:

- `coverage` (boolean)
- `files` (array): test files (default: rowstile.toml's `tests`)

Output parameters:

- `error` (object): check: the mistake, when there is one
- `exit_code` (integer)
- `ok` (boolean): true when the command found nothing wrong
- `output` (string): what the command printed

### `why` (~111 tokens)

rowstile why

Whether someone holds a permission on an object, and why; if not, why not, and the smallest changes to the data that would grant it (each tried on the database and undone).

Input parameters:

- `as` (string, required): who asks: user:42, bot:7 (a principal type and id), or anyone
- `id` (string, required)
- `perm` (string, required): a permission of the type, e.g. view
- `type` (string, required): the policy's type, e.g. folder

Output parameters:

- `error` (object): check: the mistake, when there is one
- `exit_code` (integer)
- `ok` (boolean): true when the command found nothing wrong
- `output` (string): what the command printed

### `lint` (~46 tokens)

rowstile lint

The ways around row-level security the database leaves open (authz.lint()): the app role owning a table, bypassing RLS, tables without rules, grants on masked columns, ...

Output parameters:

- `error` (object): check: the mistake, when there is one
- `exit_code` (integer)
- `ok` (boolean): true when the command found nothing wrong
- `output` (string): what the command printed

### `push` (~84 tokens)

rowstile push

Bring the development database to the policy, with the migration production would get. Only a database marked as a development database (a person marks one with rowstile push --development; the first push to one with no policy marks it): production takes migrations (rowstile migrate).

Input parameters:

- `policy` (string): the policy file (default: rowstile.toml's `policy`)

Output parameters:

- `error` (object): check: the mistake, when there is one
- `exit_code` (integer)
- `ok` (boolean): true when the command found nothing wrong
- `output` (string): what the command printed

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/rowstile-rowstile/rowstile#diagnostics

## Score history

- 2026-10-16: 80
- 2026-10-15: 80
- 2026-10-14: 80
- 2026-10-13: 39
- 2026-10-12: 50
- 2026-10-11: 49

## Common questions

### What is the rowstile MCP server?

rowstile is an MCP server listed in the public MCP registry as io.github.rowstile/rowstile. Check, test, prove and review a rowstile policy: access rules for Postgres row-level security. This page covers its npm package (rowstile).

### Is the rowstile MCP server safe to use?

rowstile scores 80 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 16 October 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the rowstile MCP server expose?

rowstile exposes 7 tools: check, prove, review, test, why, and 2 more. Their descriptions and schemas cost roughly 511 tokens of context every time the server is loaded.

### Is the rowstile MCP server still maintained?

rowstile is still listed as active in the MCP registry. We last reached this channel on 16 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the rowstile MCP server under?

rowstile declares the Apache-2.0 licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/rowstile
- Socket report: https://socket.dev/npm/package/rowstile
- Repository: https://github.com/rowstile/rowstile
- Website: https://rowstile.dev/reference/tools
- Changelog RSS feed: https://verifymcp.io/servers/rowstile-rowstile/rowstile.xml
- Changelog JSON feed: https://verifymcp.io/servers/rowstile-rowstile/rowstile.json
- HTML version of this page: https://verifymcp.io/servers/rowstile-rowstile/rowstile