# io.github.MMasey/atag-mcp (npm · atag-mcp)

ATAG 2.0 (Authoring Tool Accessibility Guidelines) guidance for authoring tool developers

- Trust score: 79/100 (medium)
- Change this week: +34
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `atag-mcp`: 79/100 (this document), [markdown](https://verifymcp.io/servers/mmasey-atag-mcp/atag-mcp.md), [page](https://verifymcp.io/servers/mmasey-atag-mcp/atag-mcp)

## Channel facts

- Registry: `npm`
- Package: `atag-mcp`
- Version: `1.0.2`
- 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 2026-08-03.

- **Supply Chain Security**: 87/100
  - No malware found by supply-chain analysis.
  - Only part of the dependency tree could be resolved (95 of 99), so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Only part of the dependency tree could be resolved (95 of 99), so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to MMasey/atag-mcp).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 26 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 77/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 754 tokens (~58/item across 13 items; 13 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 93/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 79% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add mmasey-atag-mcp -- npx -y atag-mcp
```

### Codex

```bash
codex mcp add mmasey-atag-mcp -- npx -y atag-mcp
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add mmasey-atag-mcp --command npx --arg -y --arg atag-mcp
```

### Hermes

```yaml
mcp_servers:
  mmasey-atag-mcp:
    command: "npx"
    args: ["-y", "atag-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "mmasey-atag-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "atag-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.

### 2026-08-03 (score 79, +4)

- [functional improvement] Stability: unverified → 0.27

### 2026-08-02 (score 75, +70)

- [security improvement] Install scripts: unverified → pass
- [security improvement] Provenance: unverified → pass
- [security improvement] Known CVEs: unverified → partial
- [security improvement] Malware scan: unverified → pass
- [security] Stability: Stability not yet verified: not enough scan history yet (needs a 30-day window).
- [security] The attested source repository moved: MMasey/atag-mcp
- [functional regression] Security disclosure: fail → unverified
- [functional improvement] Schema quality: unverified → excellent
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] License: unverified → pass
- [functional improvement] Dependency health: unverified → partial
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] MCP protocol: unverified → pass
- [functional] Licence: MIT

### 2026-08-01 (score 5, −15)

- [functional regression] Tool coverage: 100 → unverified
- [functional] First check of Schema quality: unverified

### 2026-07-31 (score 20, −25)

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

### 2026-07-27 (score 45)

First indexed and scored.

## MCP tools (13)

### `get-server-info` (~34 tokens)

Get information about this ATAG MCP server including the total number of principles, guidelines, success criteria, and glossary terms available.

### `explain-atag` (~42 tokens)

Get an overview of ATAG 2.0 — what it is, who it applies to, how it differs from WCAG, and its two-part structure.

### `list-parts` (~26 tokens)

List both parts of ATAG 2.0 with their descriptions and principle counts.

### `list-principles` (~52 tokens)

List ATAG 2.0 principles. Optionally filter by part (A or B).

Input parameters:

- `part` (string): Part A (tool UI accessibility) or Part B (supporting accessible content production)

### `list-guidelines` (~72 tokens)

List ATAG 2.0 guidelines. Optionally filter by part (A or B) and/or principle ID (e.g. 'A.3').

Input parameters:

- `part` (string): Part A (tool UI accessibility) or Part B (supporting accessible content production)
- `principleId` (string)

### `list-success-criteria` (~87 tokens)

List ATAG 2.0 success criteria. Filter by part, principle ID, guideline ID, and/or conformance level.

Input parameters:

- `guidelineId` (string)
- `level` (string): ATAG conformance level
- `part` (string): Part A (tool UI accessibility) or Part B (supporting accessible content production)
- `principleId` (string)

### `get-criterion` (~81 tokens)

Get full details for a specific ATAG 2.0 success criterion by ID (e.g. 'B.2.3.1' or 'A.3.1.2'), including description, conformance level, and implementation notes.

Input parameters:

- `id` (string, required): Success criterion ID, e.g. 'B.2.3.1'

### `get-guideline` (~64 tokens)

Get full details for a specific ATAG 2.0 guideline by ID (e.g. 'B.2.3'), including its description and all child success criteria.

Input parameters:

- `id` (string, required): Guideline ID, e.g. 'B.2.3'

### `get-criteria-by-level` (~76 tokens)

Get all ATAG 2.0 success criteria at a specific conformance level (A, AA, or AAA). Optionally filter by part.

Input parameters:

- `level` (string, required): ATAG conformance level
- `part` (string): Part A (tool UI accessibility) or Part B (supporting accessible content production)

### `search-atag` (~54 tokens)

Search across all ATAG 2.0 content (principles, guidelines, success criteria, glossary) using keywords.

Input parameters:

- `query` (string, required): Search query, e.g. 'keyboard access' or 'alternative text'

### `list-glossary-terms` (~23 tokens)

List all ATAG 2.0 glossary terms.

### `get-glossary-term` (~50 tokens)

Get the definition of a specific ATAG 2.0 term.

Input parameters:

- `term` (string, required): The term to look up, e.g. 'authoring tool' or 'editing-view'

### `get-guidance` (~93 tokens)

Given a description of an authoring tool feature or scenario, return the most relevant ATAG 2.0 success criteria. Use this to find which criteria apply when building a specific feature.

Input parameters:

- `description` (string, required): Describe the authoring tool feature or scenario, e.g. 'We are building an image upload dialog that lets authors insert images into content' or 'Our tool automatically generates HTML from a visual lay…

## Diagnostics

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

## Score history

- 2026-08-03: 79
- 2026-08-02: 75
- 2026-08-01: 5
- 2026-07-31: 20
- 2026-07-30: 45
- 2026-07-28: 45
- 2026-07-27: 45

## Links

- npm package: https://www.npmjs.com/package/atag-mcp
- Socket report: https://socket.dev/npm/package/atag-mcp
- Repository: https://github.com/MMasey/atag-mcp
- Changelog RSS feed: https://verifymcp.io/servers/mmasey-atag-mcp/atag-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/mmasey-atag-mcp/atag-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/mmasey-atag-mcp/atag-mcp