# io.github.codelipenghui/mcp-mat (npm · mcp-mat)

Headless Eclipse MAT MCP server for Java heap dump analysis

- Trust score: 61/100 (medium)
- Change this week: +37
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `mcp-mat`: 61/100 (this document), [markdown](https://verifymcp.io/servers/codelipenghui-mcp-mat/mcp-mat.md), [page](https://verifymcp.io/servers/codelipenghui-mcp-mat/mcp-mat)

## Channel facts

- Registry: `npm`
- Package: `mcp-mat`
- Version: `0.1.0`
- 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**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (Apache-2.0).
  - Actively maintained (last published 137 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 49/100
  - AI-judged instruction clarity (fair).
  - Tool/resource definitions use about 440 tokens (~73/item across 6 items; 6 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**: 70/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 9% 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 codelipenghui-mcp-mat -- npx -y mcp-mat
```

### Codex

```bash
codex mcp add codelipenghui-mcp-mat -- npx -y mcp-mat
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add codelipenghui-mcp-mat --command npx --arg -y --arg mcp-mat
```

### Hermes

```yaml
mcp_servers:
  codelipenghui-mcp-mat:
    command: "npx"
    args: ["-y", "mcp-mat"]
```

### Other

```json
{
  "mcpServers": {
    "codelipenghui-mcp-mat": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mat"
      ]
    }
  }
}
```

## 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 61, +4)

- [functional improvement] Stability: unverified → 0.27

### 2026-08-02 (score 57, +52)

- [security regression] Provenance: unverified → fail
- [security improvement] Install scripts: 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).
- [functional regression] Security disclosure: fail → unverified
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] License: unverified → pass
- [functional improvement] Schema quality: unverified → fair
- [functional improvement] Dependency health: unverified → partial
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] MCP protocol: unverified → pass
- [functional] Licence: Apache-2.0

### 2026-07-31 (score 5, −1)

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

### 2026-07-30 (score 6, −36)

- [security regression] Malware scan: pass → unverified
- [functional regression] Tool coverage: 100 → unverified

### 2026-07-28 (score 42, +18)

- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Schema quality: pass
- [functional] First check of Schema quality: fail
- [functional] First check of Tool coverage: 9
- [functional] First check of Schema quality: unverified

### 2026-07-27 (score 24)

First indexed and scored.

## MCP tools (6)

### `mat_healthcheck` (~33 tokens)

Validate MAT launcher and Java runtime availability.

Input parameters:

- `java_path` (string)
- `mat_home` (string)

### `mat_parse_report` (~61 tokens)

Run a predefined MAT report headlessly and return generated artifacts.

Input parameters:

- `heap_path` (string, required)
- `options` (object)
- `report_id` (string, required)
- `timeout_sec` (integer)
- `xmx_mb` (integer)

### `mat_oql_query` (~76 tokens)

Execute a single MAT OQL query and return result artifacts.

Input parameters:

- `format` (string)
- `heap_path` (string, required)
- `limit` (integer)
- `oql` (string, required)
- `timeout_sec` (integer)
- `unzip` (boolean)
- `xmx_mb` (integer)

### `mat_index_status` (~29 tokens)

Report whether MAT index artifacts already exist for a heap dump.

Input parameters:

- `heap_path` (string, required)

### `mat_run_command` (~216 tokens)

Execute a named MAT analysis command headlessly and return result artifacts. Supports 56 built-in commands including: dominator_tree, path2gc, merge_shortest_paths, histogram, thread_overview, thread_details, collection_fill_ratio, gc_roots, find_strings, component_report, system_properties, and many more. Use mat_oql_query for OQL queries instead.

Input parameters:

- `command_args` (string): Optional arguments for the command. Format depends on the command, e.g. an object address like '0x12345678' for path2gc, or a class pattern for histogram.
- `command_name` (string, required): MAT command name, e.g. histogram, dominator_tree, path2gc, thread_overview, collection_fill_ratio, gc_roots, find_strings, etc.
- `format` (string)
- `heap_path` (string, required)
- `limit` (integer)
- `timeout_sec` (integer)
- `unzip` (boolean)
- `xmx_mb` (integer)

### `mat_oql_spec` (~25 tokens)

Return MAT OQL parser-mode guidance, supported patterns, and known limitations.

## Diagnostics

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

## Score history

- 2026-08-03: 61
- 2026-08-02: 57
- 2026-08-01: 5
- 2026-07-31: 5
- 2026-07-30: 6
- 2026-07-28: 42
- 2026-07-27: 24

## Links

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