biz.dfch.AsdSte100Mcp

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

An MCP server for the ASD-STE100 (Simplified Technical English) Issue 9 standard.

ASD-STE100: Copyright by (c) ASD.

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

Table of Contents

• Tools
• Resources
• Installation
• Usage
• Authentication
• Add to OpenCode
• Development
• Related Projects
• Make a Release
• 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

pip install biz-dfch-asdste100mcp

Or with uv:

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.

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)

asdste100-mcp

Run MCP Inspector against the server over stdio:

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

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

SSE / network

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:

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

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

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):

"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

uv sync --all-extras

Run linters

uv run --frozen ruff format --check
uv run --frozen ruff check
uv run --frozen pylint $(git ls-files '*.py')

Run tests

uv run --frozen python -m unittest discover -v -s tests -t . -p "test_*.py"

Related Projects

This server is part of the ASD-STE100 tooling family:

• biz.dfch.AsdSte100Vocab — the ASD-STE100 Issue 9 vocabulary library
• biz.dfch.AsdSte100Rules — the ASD-STE100 Issue 9 ruleset library
• biz.dfch.AsdSte100Nlp — WordNet-based synonym lookup for ASD-STE100 words
• biz.dfch.AsdSte100Lookup — an interactive CLI to look up words and rules
• biz.dfch.AsdSte100Mcp — this repo: an MCP server exposing vocabulary and rules lookup tools

Make a Release

1. Make sure all tests pass

Before releasing, make sure the CI pipeline is green on the dev branch:

uv run --frozen ruff format --check
uv run --frozen ruff check
uv run --frozen pylint $(git ls-files '*.py')
uv run --frozen python -m unittest discover -v -s tests -t . -p "test_*.py"

2. Increase the version

Update the version in pyproject.toml:

version = "x.y.z"

3. Commit and push to dev

git add pyproject.toml CHANGELOG.md
git commit -m "chore: bump version to vx.y.z"
git push origin dev

4. Merge dev into main

git checkout main
git merge dev
git push origin main

5. Create and push a version tag

export VERSION=x.y.z
git tag v${VERSION}
git push origin v${VERSION}

Pushing the tag triggers the publish.yml workflow, which will:

1. Build the sdist and wheel.
2. Publish to TestPyPI (environment testpypi).
3. Publish to PyPI (environment pypi), only if TestPyPI succeeded.
4. Publish to the MCP Registry (publish-to-mcp-registry job) — requires the new version to be live on PyPI first.
5. Create a GitHub Release with auto-generated notes and the distribution artifacts attached.

Then switch back to dev to continue work:

git checkout dev

Configure Trusted Publishing

The workflow uses OIDC Trusted Publishing — no API tokens or secrets are needed.

GitHub: create environments

Go to your repo → Settings → Environments and create two environments:

Environment	Recommended protection
testpypi	None required
pypi	Add a required reviewer to prevent accidental production releases

TestPyPI

Log in at test.pypi.org → Your account → Publishing → Add a new pending publisher:

Field	Value
PyPI project name	biz-dfch-asdste100mcp
Owner	dfch
Repository	biz.dfch.AsdSte100Mcp
Workflow name	publish.yml
Environment	testpypi

PyPI

Log in at pypi.org → Your account → Publishing → Add a new pending publisher:

Field	Value
PyPI project name	biz-dfch-asdste100mcp
Owner	dfch
Repository	biz.dfch.AsdSte100Mcp
Workflow name	publish.yml
Environment	pypi

MCP Registry Publishing

The publish-to-mcp-registry job uses GitHub OIDC authentication and does not require additional setup — it will automatically publish to the official MCP Registry once the package is live on PyPI.

Verify your server is registered:

curl "https://registry.modelcontextprotocol.io/v0.1/servers?search=io.github.dfch/biz-dfch-asdste100mcp"

License

AGPL-3.0-or-later