# io.github.OSSNokalva/asn1-mcp (remote · asn1.io)

Compiles ASN.1 schema definitions into executable source code like Python and Rust.

- Trust score: 68/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `asn1.io`: 68/100 (this document), [markdown](https://verifymcp.io/servers/ossnokalva-asn1-mcp/asn1.md), [page](https://verifymcp.io/servers/ossnokalva-asn1-mcp/asn1)

## Channel facts

- Endpoint: `https://asn1.io/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## 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 2026-11-05.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 1 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 322 tokens (~322/item across 1 items; 1 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 33/100
  - Stability observed for 10 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% 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 1 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 1 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the io.github.OSSNokalva/asn1-mcp server?

io.github.OSSNokalva/asn1-mcp is a hosted endpoint at https://asn1.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http ossnokalva-asn1-mcp 'https://asn1.io/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "ossnokalva-asn1-mcp": {
      "url": "https://asn1.io/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "ossnokalva-asn1-mcp": {
      "type": "http",
      "url": "https://asn1.io/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.ossnokalva-asn1-mcp]
url = "https://asn1.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ossnokalva-asn1-mcp": {
      "type": "remote",
      "url": "https://asn1.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ossnokalva-asn1-mcp --url 'https://asn1.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  ossnokalva-asn1-mcp:
    url: "https://asn1.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "ossnokalva-asn1-mcp": {
      "Transport": "http",
      "Url": "https://asn1.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add ossnokalva-asn1-mcp -t streamable-http -u 'https://asn1.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "ossnokalva-asn1-mcp": {
      "type": "http",
      "url": "https://asn1.io/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.

### 2026-11-05 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 67, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 64, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-26 (score 63)

First indexed and scored.

## MCP tools (1)

### `compile_asn1_schema` (~322 tokens)

Compiles ASN.1 schema definitions into executable source code. Use this tool whenever a user asks to generate code, compile an ASN.1 schema, or create a codec (e.g., DER, PER, UPER, BER) for a specific programming language. The tool returns the compilation status, error messages, and files containing the generated source code.

Input parameters:

- `codec` (string): The ASN.1 encoding rules to support in the generated code. Valid options include 'uper', 'per', 'der', 'ber', or 'oer'. If the user does not specify a codec, default to 'der'.
- `fileName` (string): The name of the schema file being compiled. This should end in '.asn' (e.g., 'Rocket.asn'). If the user does not provide a filename, invent a logical one based on the schema's main module name. It is…
- `schemaContent` (string): Plain-text ASN.1 schema definition. This must be valid ASN.1 syntax, typically starting with the 'DEFINITIONS' keyword and concluding with 'END'.
- `targetLanguage` (string): The target programming language for the generated code. Allowed values include 'python' and ‘rust’. Infer this from the user's prompt. If not specified, ask the user before calling the tool.
- `userId` (string): The user's email address to look up the asn1.io user account. If the user's identity is unknown, pass an empty string.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/ossnokalva-asn1-mcp/asn1#diagnostics

## Score history

- 2026-11-05: 68
- 2026-11-04: 67
- 2026-11-03: 67
- 2026-11-02: 66
- 2026-11-01: 66
- 2026-10-31: 66
- 2026-10-30: 65
- 2026-10-29: 65
- 2026-10-28: 64
- 2026-10-27: 64
- 2026-10-26: 63

## Common questions

### What is the io.github.OSSNokalva/asn1-mcp server?

io.github.OSSNokalva/asn1-mcp is listed in the public MCP registry as io.github.OSSNokalva/asn1-mcp. Compiles ASN.1 schema definitions into executable source code like Python and Rust. This page covers its hosted endpoint (https://asn1.io/mcp).

### Is the io.github.OSSNokalva/asn1-mcp server safe to use?

io.github.OSSNokalva/asn1-mcp scores 68 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 io.github.OSSNokalva/asn1-mcp server expose?

io.github.OSSNokalva/asn1-mcp exposes 1 tool: compile_asn1_schema. Their descriptions and schemas cost roughly 322 tokens of context every time the server is loaded.

### Does the io.github.OSSNokalva/asn1-mcp server require authentication?

No. We connected to io.github.OSSNokalva/asn1-mcp without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the io.github.OSSNokalva/asn1-mcp server still maintained?

io.github.OSSNokalva/asn1-mcp is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://asn1.io/mcp
- Changelog RSS feed: https://verifymcp.io/servers/ossnokalva-asn1-mcp/asn1.xml
- Changelog JSON feed: https://verifymcp.io/servers/ossnokalva-asn1-mcp/asn1.json
- HTML version of this page: https://verifymcp.io/servers/ossnokalva-asn1-mcp/asn1