# A0 (mcpb · linux-x64)

Write, check, run and compile A0 programs through revision-checked structured edits.

- Trust score: 10/100 (low)
- Change this week: 0
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- mcpb · `osx-arm64`: 10/100, [markdown](https://verifymcp.io/servers/joe-simo-a0/a0-mcp-darwin-arm64.md), [page](https://verifymcp.io/servers/joe-simo-a0/a0-mcp-darwin-arm64)
- mcpb · `osx-x64`: 10/100, [markdown](https://verifymcp.io/servers/joe-simo-a0/a0-mcp-darwin-x64.md), [page](https://verifymcp.io/servers/joe-simo-a0/a0-mcp-darwin-x64)
- mcpb · `linux-arm64`: 8/100, [markdown](https://verifymcp.io/servers/joe-simo-a0/a0-mcp-linux-arm64.md), [page](https://verifymcp.io/servers/joe-simo-a0/a0-mcp-linux-arm64)
- mcpb · `linux-x64`: 10/100 (this document), [markdown](https://verifymcp.io/servers/joe-simo-a0/a0-mcp-linux-x64.md), [page](https://verifymcp.io/servers/joe-simo-a0/a0-mcp-linux-x64)
- mcpb · `win-x64`: 10/100, [markdown](https://verifymcp.io/servers/joe-simo-a0/a0-mcp-windows-x64.md), [page](https://verifymcp.io/servers/joe-simo-a0/a0-mcp-windows-x64)

## Channel facts

- Registry: `mcpb`
- Package: `https://github.com/Joe-Simo/a0/releases/download/v0.8.16/a0-mcp-linux-x64.mcpb`
- Transport: `stdio`
- SHA-256: `fb770d4518210b5068ed685c616c491631ffd4d18ec2f7bb04ecbc0d7600027e`

## 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 2026-11-05.

- **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 34 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 0/100
  - Schema quality not yet verified: this package installed, but its server did not start, so we have no schema to assess.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: this package installed, but its server did not start, so we have no schema to compare.
- **Tool Coverage**: 0/100
  - Tool coverage not yet verified: this package installed, but its server did not start, so we have no tool definitions to assess.
- **Tool Safety**: 0/100
  - Tool safety not yet verified: this package installed, but its server did not start, so we have no tool text to scan.
- **Capabilities**: 0/100
  - Protocol version not yet verified: this package installed, but its server did not start, so we never saw its MCP handshake.

**Unverified: 6 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 A0 MCP server?

A0 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, fb770d4518210b5068ed685c616c491631ffd4d18ec2f7bb04ecbc0d7600027e; the commands to do that are on this page. If it does not match, do not open it.

- Download bundle: `https://github.com/Joe-Simo/a0/releases/download/v0.8.16/a0-mcp-linux-x64.mcpb`
- SHA-256: `fb770d4518210b5068ed685c616c491631ffd4d18ec2f7bb04ecbc0d7600027e`

### Verify on macOS / Linux

```bash
echo "fb770d4518210b5068ed685c616c491631ffd4d18ec2f7bb04ecbc0d7600027e  a0-mcp-linux-x64.mcpb" | shasum -a 256 -c
```

### Verify on Windows (PowerShell)

```powershell
(Get-FileHash -Algorithm SHA256 .\a0-mcp-linux-x64.mcpb).Hash -eq "fb770d4518210b5068ed685c616c491631ffd4d18ec2f7bb04ecbc0d7600027e"
```

## 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.

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

- [functional improvement] Security disclosure: fail → pass

### 2026-10-01 (score 0)

First indexed and scored.

## MCP tools (0)

Tools for package channels are captured by running the package in an isolated sandbox. The most recent sandbox run could not capture a tool list from this package.

## Diagnostics

Captured diagnostic sections: Provenance. The full working is on the page: https://verifymcp.io/servers/joe-simo-a0/a0-mcp-linux-x64#diagnostics

## Score history

- 2026-11-05: 10
- 2026-11-04: 10
- 2026-11-03: 10
- 2026-11-02: 10
- 2026-11-01: 10
- 2026-10-31: 10
- 2026-10-30: 10
- 2026-10-29: 10
- 2026-10-28: 10
- 2026-10-27: 10
- 2026-10-26: 10
- 2026-10-25: 10
- 2026-10-24: 10
- 2026-10-23: 10
- 2026-10-22: 10
- 2026-10-21: 10
- 2026-10-20: 10
- 2026-10-19: 10
- 2026-10-18: 10
- 2026-10-17: 10
- 2026-10-16: 10
- 2026-10-15: 10
- 2026-10-14: 10
- 2026-10-13: 10
- 2026-10-12: 10
- 2026-10-10: 10
- 2026-10-07: 9
- 2026-10-05: 9
- 2026-10-04: 9
- 2026-10-03: 9

## Common questions

### What is the A0 MCP server?

A0 is an MCP server listed in the public MCP registry as io.github.Joe-Simo/a0. Write, check, run and compile A0 programs through revision-checked structured edits. This page covers its MCPB bundle (https://github.com/Joe-Simo/a0/releases/download/v0.8.16/a0-mcp-linux-x64.mcpb).

### Is the A0 MCP server safe to use?

A0 scores 10 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 licence is the A0 MCP server under?

A0 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/Joe-Simo/a0
- Website: https://a0lang.com/
- Changelog RSS feed: https://verifymcp.io/servers/joe-simo-a0/a0-mcp-linux-x64.xml
- Changelog JSON feed: https://verifymcp.io/servers/joe-simo-a0/a0-mcp-linux-x64.json
- HTML version of this page: https://verifymcp.io/servers/joe-simo-a0/a0-mcp-linux-x64