# spintax.net MCP server (npm · @spintax/mcp)

Write, validate, render and analyze spintax templates. Backed by @spintax/core. No auth.

- Trust score: 88/100 (high trust)
- Change this week: +16
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-21

## Components

- remote · `spintax.net`: 84/100, [markdown](https://verifymcp.io/servers/net-spintax-mcp/spintax.md), [page](https://verifymcp.io/servers/net-spintax-mcp/spintax)
- npm · `@spintax/mcp`: 88/100 (this document), [markdown](https://verifymcp.io/servers/net-spintax-mcp/spintax-mcp.md), [page](https://verifymcp.io/servers/net-spintax-mcp/spintax-mcp)

## Channel facts

- Registry: `npm`
- Package: `@spintax/mcp`
- Version: `0.3.2`
- 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 2026-09-21.

- **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 2 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 71/100
  - Repository check failed: no source repository is declared.
  - Cryptographically verified build provenance (signed, bound to investblog/spintax-js).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 7 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 822 tokens (~205/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 97/100
  - Stability observed for 29 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 98/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 92% 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 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the spintax.net MCP server server?

spintax.net MCP server runs locally as an npm package, launched with npx -y @spintax/mcp. 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 net-spintax-mcp -- npx -y @spintax/mcp
```

### Cursor

```json
{
  "mcpServers": {
    "net-spintax-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@spintax/mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "net-spintax-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@spintax/mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add net-spintax-mcp -- npx -y @spintax/mcp
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add net-spintax-mcp --command npx --arg -y --arg @spintax/mcp
```

### Hermes

```yaml
mcp_servers:
  net-spintax-mcp:
    command: "npx"
    args: ["-y", "@spintax/mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "net-spintax-mcp": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@spintax/mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add net-spintax-mcp -t stdio -c npx -a -y @spintax/mcp
```

### Other

```json
{
  "mcpServers": {
    "net-spintax-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@spintax/mcp"
      ]
    }
  }
}
```

## 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.

### 2026-09-21 (score 88, +1)

No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-18 (score 87, −1)

- [functional] Stability: pass → 0.87

### 2026-09-16 (score 88, 0)

- [security] Stability: 0.97 → pass

### 2026-09-15 (score 88, +16)

- [security improvement] Malware scan: unverified → pass

### 2026-09-13 (score 72, 0)

- [security improvement] Malware scan: unverified → pass
- [functional] Package version: 0.3.1 → 0.3.2

### 2026-09-12 (score 72, −14)

- [security regression] Malware scan: pass → unverified
- [security regression] Stability: 0.83 → unverified
- [security regression] Tool safety: pass → unverified
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional] First check of Schema quality: unverified
- [functional] Package version: 0.3.0 → 0.3.1

### 2026-09-10 (score 86, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-08 (score 85, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (4)

### `validate_spintax` (~178 tokens)

Validate a spintax template

Static validation: returns diagnostics with severity, stable code, message and 1-based line/column. No "error"-severity diagnostic means the template is structurally sound — read the warnings before rendering, because some of them (plural.locale-missing) mean a block will not resolve. Pass knownVariables for names you will supply at render time to silence their variable.undefined warnings.

Input parameters:

- `knownVariables` (array): Variable names the caller will supply at render time (case-insensitive).
- `locale` (string): Locale for {plural …} arity, e.g. "en" (2-form) or "ru" (3-form: ru/uk/be/sr/hr/bs). Omit for the 2-form default.
- `template` (string, required): Spintax template source. #include is disabled on this server.

Output parameters:

- `diagnostics` (array)
- `errorCount` (integer)
- `valid` (boolean): True when no error-severity diagnostics.
- `warningCount` (integer)

### `render_spintax` (~199 tokens)

Render spintax variants

Renders up to 50 variants. With a seed the output is deterministic (variant i uses seed "<seed>#<i>"); without one it is random. The engine is lenient: structural mistakes never throw, they surface in the output — run validate_spintax first.

Input parameters:

- `context` (object): Variable map, e.g. {"CITY": "Prague"}. Overrides #set/#def definitions.
- `count` (integer): Number of variants (1–50).
- `locale` (string): Locale for {plural …} arity, e.g. "en" (2-form) or "ru" (3-form: ru/uk/be/sr/hr/bs). Omit for the 2-form default.
- `seed` (string|number): Deterministic RNG seed; omit for random output.
- `template` (string, required): Spintax template source. #include is disabled on this server.

Output parameters:

- `variants` (array)

### `analyze_spintax` (~151 tokens)

Analyze a spintax template

Reports what the template needs and contains: refs (variables referenced), sets (#set macros, re-picked per reference), defs (#def, rolled once per render), includes, diagnostics, and best-effort construct counts. Answers "what variables must I supply" — it is NOT a variant-cardinality counter.

Input parameters:

- `knownVariables` (array)
- `locale` (string): Locale for {plural …} arity, e.g. "en" (2-form) or "ru" (3-form: ru/uk/be/sr/hr/bs). Omit for the 2-form default.
- `template` (string, required): Spintax template source. #include is disabled on this server.

Output parameters:

- `constructs` (object)
- `defs` (array)
- `diagnostics` (array)
- `includes` (array)
- `refs` (array)
- `sets` (array)

### `spintax_authoring_guide` (~175 tokens)

How to write a spintax template

Read this BEFORE writing or editing a spintax template — it is the canonical authoring guide the whole spintax toolchain is written against, not a tutorial. Pass the locale you will author in: for ru/uk/be and sr/hr/bs it carries the agreement and case rules that decide whether the variants read as human writing, which is the hard part and the part a valid template can still get wrong. Returns text to read, not a template.

Input parameters:

- `locale` (string): Language you will author in, e.g. "en" or "ru". Selects the grammar rules and the worked examples. Omit for the language-neutral rules only.
- `variationLevel` (string): How much markup to use. Omit to decide for yourself — the guide then states no level.

Output parameters:

- `locale` (string)
- `promptVersion` (string): Version of the rules TEXT (@spintax/authoring-prompt PROMPT_VERSION). Moves when the wording changes in a way that can change what a model writes.
- `rules` (string): The authoring rules, as text to read.

## Diagnostics

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

## Score history

- 2026-09-21: 88
- 2026-09-20: 87
- 2026-09-19: 87
- 2026-09-18: 87
- 2026-09-17: 88
- 2026-09-16: 88
- 2026-09-15: 88
- 2026-09-14: 72
- 2026-09-13: 72
- 2026-09-12: 72
- 2026-09-11: 86
- 2026-09-10: 86
- 2026-09-09: 85
- 2026-09-08: 85
- 2026-09-07: 84
- 2026-09-06: 84
- 2026-09-05: 83
- 2026-09-04: 83
- 2026-09-03: 82
- 2026-09-02: 82
- 2026-09-01: 81
- 2026-08-31: 81
- 2026-08-30: 80
- 2026-08-29: 80
- 2026-08-28: 80
- 2026-08-27: 79
- 2026-08-26: 79
- 2026-08-25: 77
- 2026-08-24: 76
- 2026-08-23: 76

## Common questions

### What is the spintax.net MCP server server?

spintax.net MCP server is listed in the public MCP registry as net.spintax/mcp. Write, validate, render and analyze spintax templates. Backed by @spintax/core. No auth. This page covers its npm package (@spintax/mcp).

### Is the spintax.net MCP server server safe to use?

spintax.net MCP server scores 88 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 21 September 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 spintax.net MCP server server expose?

spintax.net MCP server exposes 4 tools: validate_spintax, render_spintax, analyze_spintax, spintax_authoring_guide. Their descriptions and schemas cost roughly 703 tokens of context every time the server is loaded.

### Is the spintax.net MCP server server still maintained?

spintax.net MCP server is still listed as active in the MCP registry. We last reached this channel on 21 September 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 spintax.net MCP server server under?

spintax.net MCP server declares the MIT 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/@spintax/mcp
- Socket report: https://socket.dev/npm/package/@spintax/mcp
- Website: https://spintax.net/docs/
- Changelog RSS feed: https://verifymcp.io/servers/net-spintax-mcp/spintax-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/net-spintax-mcp/spintax-mcp.json
- HTML version of this page: https://verifymcp.io/servers/net-spintax-mcp/spintax-mcp