# ViperMesh for Blender (mcpb · vipermesh-blender-1.3.0.mcpb)

Free Blender MCP addon for faster AI scene edits, fewer tokens and built-in scene checks.

- Trust score: 38/100 (low)
- Change this week: +28
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-17

## Components

- mcpb · `vipermesh-blender-1.3.0.mcpb`: 38/100 (this document), [markdown](https://verifymcp.io/servers/ker102-vipermesh-blender/vipermesh-blender.md), [page](https://verifymcp.io/servers/ker102-vipermesh-blender/vipermesh-blender)

## Channel facts

- Registry: `mcpb`
- Package: `https://github.com/Ker102/vipermesh-blender/releases/download/v1.3.0/vipermesh-blender-1.3.0.mcpb`
- Transport: `stdio`
- SHA-256: `45f8cee90540e9f906b8e817efb6fa0a1302f8dba515522dc3682d328a90206c`

## 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 2026-10-17.

- **Supply Chain Security**: 0/100
  - No malware scan is available for this kind of package: the supply-chain vendors we use do not cover it. This is a permanent gap in our coverage, not a finding about the package.
  - Known CVEs could not be checked: we found no dependency list to check in this bundle: either it runs a compiled binary, whose bundled manifests we do not read, or none of the package.json, requirements.txt, pyproject.toml or uv.lock files it ships for its runtime declares a dependency we can read (a requirements.txt that only points at a setup.py project, a local path, or a nested requirements file we cannot follow counts as none).
  - Install-script risk not yet assessed.
  - Dependency health could not be checked: we found no dependency list to check in this bundle: either it runs a compiled binary, whose bundled manifests we do not read, or none of the package.json, requirements.txt, pyproject.toml or uv.lock files it ships for its runtime declares a dependency we can read (a requirements.txt that only points at a setup.py project, a local path, or a nested requirements file we cannot follow counts as none).
- **Provenance & Transparency**: 48/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 10 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 72/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (fair).
  - Tool/resource definitions use about 634 tokens (~57/item across 11 items; 9 tools + 2 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**: 67/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 9 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 11 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: 2 categories.** Categories scored 0 because we could not verify them: 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 ViperMesh for Blender MCP server?

ViperMesh for Blender ships as an MCPB bundle, a single file you download and open in an MCP host that supports MCPB bundles, such as Claude Desktop. The host reads the launch command from the bundle's own manifest, so there is no command to copy. Before opening it, check the file's SHA-256 matches the one the MCP registry declares for it, 45f8cee90540e9f906b8e817efb6fa0a1302f8dba515522dc3682d328a90206c; the commands to do that are on this page. If it does not match, do not open it.

- Download bundle: `https://github.com/Ker102/vipermesh-blender/releases/download/v1.3.0/vipermesh-blender-1.3.0.mcpb`
- SHA-256: `45f8cee90540e9f906b8e817efb6fa0a1302f8dba515522dc3682d328a90206c`

### Verify on macOS / Linux

```bash
echo "45f8cee90540e9f906b8e817efb6fa0a1302f8dba515522dc3682d328a90206c  vipermesh-blender-1.3.0.mcpb" | shasum -a 256 -c
```

### Verify on Windows (PowerShell)

```powershell
(Get-FileHash -Algorithm SHA256 .\vipermesh-blender-1.3.0.mcpb).Hash -eq "45f8cee90540e9f906b8e817efb6fa0a1302f8dba515522dc3682d328a90206c"
```

## 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 38, +28)

- [security improvement] Injection markers: 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] Schema quality: unverified → 100
- [functional improvement] MCP protocol: unverified → pass
- [functional] First check of Tool coverage: 0
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: fair
- [functional] First check of Destructive annotations: pass
- [functional] First check of Schema quality: pass

### 2026-10-09 (score 10)

First indexed and scored.

## MCP tools (9)

### `bootstrap_vipermesh_session` (~36 tokens)

Bootstrap ViperMesh Session

Call once at session start. Checks Blender and returns compact operating context plus the recommended next calls for one persistent MCP session.

### `check_blender_connection` (~28 tokens)

Check Blender Connection

Check whether the local ViperMesh Blender addon is responding on its configured loopback socket.

### `list_blender_tools` (~42 tokens)

List Blender Tools

List Blender commands available through the trusted local portable gateway, including execute_code for fallback measurement.

Input parameters:

- `category` (string)
- `query` (string)

### `call_blender_tool` (~36 tokens)

Call Blender Tool

Call one approved ViperMesh Blender command with structured parameters.

Input parameters:

- `name` (string, required)
- `params` (object)

### `call_blender_tool_batch` (~58 tokens)

Call Blender Tool Batch

Run an ordered bounded sequence of approved ViperMesh Blender commands through one persistent session. Use only when intermediate observations are not needed to choose the next command.

Input parameters:

- `commands` (array, required)
- `stopOnError` (boolean)

### `run_blender_scene_stage` (~155 tokens)

Run Blender Scene Stage

Run one compact scene-workflow stage over the persistent Blender session. Use build, inspect_preview, and finalize as separate decision points; standalone tools remain available for repairs and unusual work.

Input parameters:

- `blendPath` (string)
- `cameraName` (string)
- `commands` (array)
- `groundingTolerance` (number)
- `preservePresentation` (boolean)
- `preset` (string)
- `previewPath` (string)
- `renderPath` (string)
- `resolutionX` (integer)
- `resolutionY` (integer)
- `samples` (integer)
- `spatialRelations` (array)
- `stage` (string, required)
- `targetNames` (array)

### `get_blender_agent_context` (~26 tokens)

Get Blender Agent Context

Load the public compact ViperMesh operating rules for persistent Blender MCP sessions.

### `search_3d_guidance` (~60 tokens)

Search 3D Guidance

Search checked-in ViperMesh 3D tool skills and optionally the configured semantic guidance store.

Input parameters:

- `limit` (integer)
- `minSimilarity` (number)
- `query` (string, required)
- `source` (string)

### `get_3d_guidance_document` (~35 tokens)

Get 3D Guidance Document

Read one approved Markdown reference from the checked-in ViperMesh agent skill.

Input parameters:

- `filename` (string, required)

## Diagnostics

Captured diagnostic sections: Provenance. The full working is on the page: https://verifymcp.io/servers/ker102-vipermesh-blender/vipermesh-blender#diagnostics

## Score history

- 2026-10-17: 38
- 2026-10-16: 38
- 2026-10-15: 38
- 2026-10-14: 38
- 2026-10-13: 10
- 2026-10-12: 10
- 2026-10-10: 10
- 2026-10-09: 10

## Common questions

### What is the ViperMesh for Blender MCP server?

ViperMesh for Blender is an MCP server listed in the public MCP registry as io.github.Ker102/vipermesh-blender. Free Blender MCP addon for faster AI scene edits, fewer tokens and built-in scene checks. This page covers its MCPB bundle (https://github.com/Ker102/vipermesh-blender/releases/download/v1.3.0/vipermesh-blender-1.3.0.mcpb).

### Is the ViperMesh for Blender MCP server safe to use?

ViperMesh for Blender scores 38 out of 100 on VerifyMCP. 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 ViperMesh for Blender MCP server expose?

ViperMesh for Blender exposes 9 tools: bootstrap_vipermesh_session, check_blender_connection, list_blender_tools, call_blender_tool, call_blender_tool_batch, and 4 more. Their descriptions and schemas cost roughly 476 tokens of context every time the server is loaded.

### What licence is the ViperMesh for Blender MCP server under?

ViperMesh for Blender 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

- Repository: https://github.com/Ker102/vipermesh-blender
- Website: https://ker102.github.io/vipermesh-blender/
- Changelog RSS feed: https://verifymcp.io/servers/ker102-vipermesh-blender/vipermesh-blender.xml
- Changelog JSON feed: https://verifymcp.io/servers/ker102-vipermesh-blender/vipermesh-blender.json
- HTML version of this page: https://verifymcp.io/servers/ker102-vipermesh-blender/vipermesh-blender