biz.dfch.AsdSte100Mcp

# biz.dfch.AsdSte100Mcp

<!-- mcp-name: io.github.dfch/biz-dfch-asdste100mcp -->

[![ASD-STE100: Issue 9](https://img.shields.io/badge/ASD--STE100-Issue%209-blue.svg)](https://www.asd-ste100.org/)
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[![Auth: none](https://img.shields.io/badge/auth-none-brightgreen.svg)](#authentication)

An MCP server for the [ASD-STE100 (Simplified Technical English) Issue 9 standard](https://www.asd-ste100.org/).

ASD-STE100: Copyright by (c) [ASD](https://www.asd-europe.org/).

I am in no way affiliated with ASD. ASD does not endorse my work.

## Table of Contents

- [Tools](#tools)
- [Resources](#resources)
- [Installation](#installation)
- [Usage](#usage)
- [Authentication](#authentication)
- [Add to OpenCode](#add-to-opencode)
- [Development](#development)
- [Related Projects](#related-projects)
- [Make a Release](#make-a-release)
- [License](#license)

## Authentication

This server exposes only read-only lookup tools and resources over
vocabulary and rules data that is bundled with the package; there is
nothing to authenticate against. No API keys, tokens, or credentials are
required or supported in either `stdio` or `sse` transport mode. If you
expose the `sse` transport beyond `localhost`, secure it at the network
layer (e.g. a reverse proxy) rather than expecting the server to
authenticate requests itself.

## Tools

### Vocabulary

| Tool | Description |
|---|---|
| `word_find`  | Search for a term by exact name (case-insensitive) in the ASD-STE100 Issue 9 vocabulary. Return approved/rejected status, part of speech, STE examples, and approved alternatives. Use this first when you know the exact word. Use `word_match` with a wildcard if this tool returns no items. |
| `word_find_many` | Search for multiple terms by exact name (case-insensitive) in a single call. Returns one `WordFindEntry` per input term (`term` + `results`), in the same order as the input, each holding 0, 1, or more matching vocabulary entries. |
| `word_match` | Search the vocabulary using a regular expression pattern. Return all entries whose term matches. Use it to find all words with a common prefix or pattern (e.g. ^de or .*tion$). Paginated (`max_results`/`offset`); returns a `WordResult`. |
| `word_fuzzy` | Search for a term with sequence-matching (Python difflib.get_close_matches). Results may not be obvious — use when `word_find` returns nothing and you want fuzzy suggestions. |
| `word_list` | Return all vocabulary entries. Only use when you need to process the full vocabulary. Use `word_count` instead if you only need the total. Paginated (`max_results`/`offset`); returns a `WordResult`. |
| `word_count` | Return the total number of entries in the vocabulary. Use instead of `word_list` when you only need the count. |
| `word_synonym` | Search for vocabulary entries that are WordNet synonyms of a word, via the `biz-dfch-asdste100nlp` library's `Nlp` class. Use this to find approved alternatives for a non-STE word. |

### Rules

| Tool | Description |
|---|---|
| `rules_find` | Search for rules in the ruleset by exact id (case-insensitive), e.g. `R1.1` or `GR-8`. Use this first when you know the exact id. |
| `rules_match` | Search rules using a regular expression matched against the rule `name` and `summary`. |
| `rules_search` | Full-text search across every text a rule carries (section, category, name, summary, and all content blocks: text, notes, examples, technical noun/verb lists). Optionally restrict to specific content types. Paginated (`max_results`/`offset`); returns a `SearchResult`. |
| `rules_by_section` | Search for rules by exact section name (case-insensitive), e.g. `Words`. |
| `rules_by_category` | Search for rules by exact category name (case-insensitive), e.g. `Technical nouns`. |
| `rules_examples` | Return content items across rules, optionally scoped by id/section/category and filtered by content type. Paginated (`max_results`/`offset`); returns a `RulesExamplesResult`. |
| `rules_overview` | Return a lightweight, per-rule overview (id, type, section, category, name, optional summary, and content counts/flags) without shipping every content item. |
| `rules_toc` | Return the distinct (section, category) pairs as a table-of-contents outline, optionally scoped to one section. |

## Resources

Read-only resources let a client browse or attach ruleset data directly (e.g. via
an "@mention" or resource picker), without going through a tool call.

| Resource URI | Description |
|---|---|
| `asdste100://rules/toc` | Table-of-contents outline of the ruleset: the distinct (section, category) pairs, each with the ids they contain. Mirrors the `rules_toc` tool with no `section` filter. |
| `asdste100://rules/rule/{id_}` | A single rule/recommendation/information item by exact id (case-insensitive), e.g. `asdste100://rules/rule/R1.1`. Mirrors the `rules_find` tool; an unknown id resolves to an empty list rather than an error. |
| `asdste100://version` | Installed version numbers of the MCP server itself and its three data-backing libraries: `biz-dfch-asdste100vocab`, `biz-dfch-asdste100rules`, and `biz-dfch-asdste100nlp`. |

## Installation

```bash
pip install biz-dfch-asdste100mcp
```

Or with [uv](https://docs.astral.sh/uv/):

```bash
uv add biz-dfch-asdste100mcp
```

## Usage

### MCP Inspector

If you want to test the MCP server without a tool like `OpenCode`, you can do this with [`MCP Inspector`](https://modelcontextprotocol.io/docs/2026-07-28/tools/inspector).

`MCP Inspector` is part of the `mcp[cli]` package. When you install this project with `--extra dev` you can use `MCP Inspector`.

NOTE: The examples below use `bunx` instead of `npx` to launch `MCP Inspector`; `npx` has not been tested.

### stdio (Claude Desktop, OpenCode, and other MCP hosts)

```bash
asdste100-mcp
```

Run `MCP Inspector` against the server over `stdio`:

```bash
bunx @modelcontextprotocol/inspector uv run --frozen --directory . asdste100-mcp
```

![MCP Inspector with `stdio`](./assets/mcp-stdio.png)

NOTE: Sometimes, the MCP Inspector cannot connect to the MCP server via `stdio`. Use the `sse` option (see below) instead.

### SSE / network

```bash
asdste100-mcp --transport sse --host localhost --port 8000
```

NOTE: You do not have to supply the option `--port` to the MCP server. The default value of `port` is `8000`.

Start the server, then connect `MCP Inspector` to it — these are two separate commands, run in two separate terminals:

```bash
# terminal 1: start the server
uvx --from . asdste100-mcp -t sse
```

```bash
# terminal 2: launch the inspector and connect it to the running server
bunx @modelcontextprotocol/inspector
```

![Start the MCP server with `uvx` and then start the `MCP Inspector` with `bunx`](./assets/uvx-mcp-bunx-inspector.png)

![MCP Inspector with `sse`](./assets/mcp-sse.png)

### Options

| Option | Env var | Default | Description |
|---|---|---|---|
| `--transport` | `ASDSTE100_MCP_TRANSPORT` | `stdio` | Transport mode: `stdio` or `sse` |
| `--host` | `ASDSTE100_MCP_HOST` | `localhost` | Bind address (SSE only) |
| `--port` | `ASDSTE100_MCP_PORT` | `8000` | TCP port (SSE only) |
| `--env` | — | auto-discovered | Path to a `.env` file |
| `--file` / `-f` | `ASDSTE100_MCP_FILES` | _(empty)_ | Path to a vocabulary file (`*.jsonl`); repeatable |
| `--rules-file` / `-r` | `ASDSTE100_MCP_RULES_FILES` | _(empty)_ | Path to a rules file (a single JSON array); repeatable |

### Vocabulary configuration

| Env var | Default | Description |
|---|---|---|
| `ASDSTE100_MCP_FILES` | _(empty)_ | Colon-separated paths to additional vocabulary files |
| `ASDSTE100_MCP_USE_STE100` | `true` | Load the built-in ASD-STE100 Issue 9 vocabulary |
| `ASDSTE100_MCP_USE_STE100_TECHNICAL_WORDS` | `false` | Also load the technical words vocabulary |

### Rules configuration

| Env var | Default | Description |
|---|---|---|
| `ASDSTE100_MCP_RULES_FILES` | _(empty)_ | Colon-separated paths to additional rules files (each a single JSON array) |
| `ASDSTE100_MCP_USE_STE100_RULES` | `true` | Load the built-in ASD-STE100 Issue 9 ruleset |

## Add to OpenCode

To add the ASD-STE100 (Simplified Technical English) MCP server to your OpenCode configuration:

1. Open your OpenCode config file (typically `~/.config/opencode/opencode.json` or `~/.config/opencode/opencode.jsonc`)

2. Add the following configuration to the `mcp` section (and use it via `stdio`):

```json
"asdste100": {
  "type": "local",
  "enabled": true,
  "command": ["uvx", "--from", "biz-dfch-asdste100mcp", "asdste100-mcp"]
}
```

3. Save the file and restart OpenCode

This enables OpenCode to access ASD-STE100 vocabulary and rules lookups for technical writing and documentation compliance.

## Development

### Install dev dependencies

```bash
uv sync --all-extras
```

### Run linters

```bash
uv run --frozen ruff format --check
uv run --frozen ruff check
uv run --froze