# GST Validator (remote · gst-validator-mcp.atlasword.workers.dev)

Validate Indian GSTINs locally (Verhoeff), extract PAN, identify issuing state.

- Trust score: 18/100 (low)
- Change this week: +6
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `gst-validator-mcp.atlasword.workers.dev`: 18/100 (this document), [markdown](https://verifymcp.io/servers/guptaprakhariitr-gst-validator-mcp/gst-validator-mcp.md), [page](https://verifymcp.io/servers/guptaprakhariitr-gst-validator-mcp/gst-validator-mcp)

## Channel facts

- Endpoint: `https://gst-validator-mcp.atlasword.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.1`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, 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 2026-08-03.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to connect, but we couldn't read the tool list to see what that exposes.
  - HTTPS not yet verified: we couldn't determine whether a plaintext access path exists.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 0/100
  - Transport check failed: declared streamable-http, but the endpoint returned HTTP 500.
- **Schema Quality & AI Usability**: 0/100
  - Schema not yet verified: we couldn't read the endpoint's schema.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 0/100
  - Tool coverage not yet verified: we couldn't read the endpoint's tools.
- **Capabilities**: 0/100
  - Capabilities not yet verified: we couldn't read the endpoint's capabilities.

**Unverified: 4 categories.** Categories scored 0 because we could not verify them: authentication we do not have, an unreachable endpoint, or not enough scan history. We only credit what we can confirm.

## Install

### Claude

```bash
claude mcp add --transport http guptaprakhariitr-gst-validator-mcp https://gst-validator-mcp.atlasword.workers.dev/mcp
```

### Codex

```toml
[mcp_servers.guptaprakhariitr-gst-validator-mcp]
url = "https://gst-validator-mcp.atlasword.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "guptaprakhariitr-gst-validator-mcp": {
      "type": "remote",
      "url": "https://gst-validator-mcp.atlasword.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add guptaprakhariitr-gst-validator-mcp --url https://gst-validator-mcp.atlasword.workers.dev/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  guptaprakhariitr-gst-validator-mcp:
    url: "https://gst-validator-mcp.atlasword.workers.dev/mcp"
```

### Other

```json
{
  "mcpServers": {
    "guptaprakhariitr-gst-validator-mcp": {
      "type": "http",
      "url": "https://gst-validator-mcp.atlasword.workers.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## 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.

### 2026-08-03 (score 18, −40)

- [security regression] Endpoint reachability: reachable → not serving MCP
- [security regression] Stability: 0.03 → unverified
- [security regression] Transport: pass → fail
- [security] Authorization: Authorisation not fully verified: no authorisation is required to connect, but we couldn't read the tool list to see what that exposes.
- [functional regression] Tool coverage: 100 → unverified
- [functional regression] Capabilities: fail → unverified

### 2026-08-02 (score 58, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-08-01 (score 58, +40)

- [security improvement] Transport: fail → pass
- [security] Authorization: Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
- [functional regression] MCP protocol: unverified → fail
- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Schema quality: pass
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: excellent
- [functional] First check of Tool coverage: 100

### 2026-07-31 (score 18, +6)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 12, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-27 (score 12, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 12)

First indexed and scored.

## MCP tools (3)

### `validate_gstin` (~103 tokens)

Validate an Indian GSTIN (15-char Goods & Services Tax Identification Number). Checks length, character set, state code, embedded PAN format, and the GSTN mod-36 check character. Returns {valid, state, state_code, pan, entity_code, check_char, error?}.

Input parameters:

- `gstin` (string, required): 15-char GSTIN, e.g. '27AAPFU0939F1ZV'. Case-insensitive; surrounding whitespace is trimmed.

### `extract_pan` (~74 tokens)

Extract the 10-character PAN embedded in a GSTIN (positions 3-12, 1-indexed). Throws if the GSTIN is the wrong length or the embedded PAN is malformed. Does NOT verify the check character — use validate_gstin for that.

Input parameters:

- `gstin` (string, required): 15-char GSTIN.

### `state_from_gstin` (~84 tokens)

Resolve the Indian state/UT name from a GSTIN's first 2 characters (the TIN state code). Accepts a full GSTIN or just the 2-char prefix. Returns {state_code, state_name}, e.g. ('27', 'Maharashtra').

Input parameters:

- `gstin` (string, required): Full GSTIN or 2-char state-code prefix.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/guptaprakhariitr-gst-validator-mcp/gst-validator-mcp#diagnostics

## Score history

- 2026-08-03: 18
- 2026-08-02: 58
- 2026-08-01: 58
- 2026-07-31: 18
- 2026-07-30: 12
- 2026-07-29: 12
- 2026-07-28: 12
- 2026-07-27: 12
- 2026-07-26: 12

## Links

- Remote endpoint: https://gst-validator-mcp.atlasword.workers.dev/mcp
- Repository: https://github.com/guptaprakhariitr/gst-validator-mcp
- Website: https://gst-validator-mcp.atlasword.workers.dev/
- Changelog RSS feed: https://verifymcp.io/servers/guptaprakhariitr-gst-validator-mcp/gst-validator-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/guptaprakhariitr-gst-validator-mcp/gst-validator-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/guptaprakhariitr-gst-validator-mcp/gst-validator-mcp