zh-dict-mcp

MCP server for Chinese figurative language lookup, backed by CC-CEDICT.

What it does: given a Chinese word or phrase, tells you whether its figurative usage has been lexicalized (recorded in the dictionary as an independent sense) or is a one-off creative expression.

Why it exists: LLMs writing Chinese dialogue, fiction, or roleplay tend to invent purple-prose figurative expressions that no real person would say (e.g., "他把心锁进铁盒里" / "墙比夜更厚"). This tool gives you an objective dictionary-backed check.

---

Install + use in one line

In Claude Code (or any MCP-aware client):

claude mcp add zh-dict-mcp -- uvx zh-dict-mcp

Or paste into your .mcp.json:

{
  "mcpServers": {
    "zh-dict-mcp": {
      "command": "uvx",
      "args": ["zh-dict-mcp"]
    }
  }
}

That's it. uvx pulls the package from PyPI on first run, caches it, launches the stdio MCP server. No pip install needed.

The lookup_dictionary tool is now available in your Claude Code sessions.

---

What you get

A single MCP tool:

lookup_dictionary(word: string) → JSON

Example: lookup_dictionary("看见") returns:

{
  "word": "看见",
  "found_in_cedict": true,
  "simplified": "看见",
  "traditional": "看見",
  "pinyin": "kan4 jian4",
  "definitions": ["to see", "to catch sight of"],
  "tags": {
    "has_figurative": false,
    "is_neologism": false,
    "is_slang": false,
    "has_idiom_marker": false
  }
}

Example: lookup_dictionary("内卷") returns:

{
  "word": "内卷",
  "found_in_cedict": true,
  "definitions": [
    "(embryology) to involute; involution",
    "(neologism, attested by 2017) (of a society) to become more and more involuted..."
  ],
  "tags": { "is_neologism": true, ... }
}

Example: lookup_dictionary("锁进铁盒里") (a creative one-off) returns:

{
  "word": "锁进铁盒里",
  "found_in_cedict": false,
  "found_in_whitelist": false,
  "definitions": []
}

---

Use cases

• AI-generated dialogue review: catch live metaphors LLM invents but no real speaker would use
• AI writing lint: pipeline filter for game NPC dialogue / interactive fiction / chatbot scripts
• Lexicalization research: check whether a figurative expression has been recorded in standard dictionaries
• New word verification: confirm neologisms / slang with (neologism, attested by YEAR) attribution
• Idiom / 典故 lookup: get figurative sense for idioms like "滑铁卢" → "(fig.) a defeat"

---

Data source

CC-CEDICT — open Chinese-English dictionary, 12.5万条目, community-maintained, weekly updates.

License: CC BY-SA 4.0. Bundled in package. See LICENSE-CC-CEDICT.

Why CC-CEDICT vs 现代汉语词典 (XDHYCD) or other sources:

Source	Coverage on AI-writing test set	Notes
chinese-xinhua (GitHub data)	46%	Heavy classical/古汉语 bias
现代汉语词典 第7版 (XDHYCD7th)	56%	Doesn't list literal compound words (放下/抓住/等等)
CC-CEDICT	~95%	Modern usage + neologisms + (fig.) / (slang) / (neologism) markers

CC-CEDICT explicitly tags figurative senses, neologisms with attestation years, slang, and idioms — exactly the structure needed for figurative-language analysis.

---

Optional: project whitelist

For project-specific overrides (e.g., words CC-CEDICT happens to miss):

# my_whitelist.yaml
allowed:
  - word: 凛然
    note: Standard literary usage, CC-CEDICT misses it
  - word: 头疼
    note: Override to include "annoyance" figurative sense

Pass via CLI:

{
  "mcpServers": {
    "zh-dict-mcp": {
      "command": "uvx",
      "args": ["zh-dict-mcp", "--whitelist", "/abs/path/to/my_whitelist.yaml"]
    }
  }
}

Or via env var ZH_DICT_WHITELIST=/path/to/file.yaml.

When a word is in the whitelist, the result includes "found_in_whitelist": true and the note.

---

Python API (no MCP needed)

Use the lookup library directly without launching a server:

from zh_dict_mcp import DictionaryLookup

lookup = DictionaryLookup()  # bundled CC-CEDICT loads in ~200ms
result = lookup.lookup("滑铁卢")

print(result.found)              # True
print(result.definitions)        # ['Waterloo (Belgium)', 'Battle of Waterloo (1815)', '(fig.) a defeat']
print(result.tags.has_figurative)  # True
print(result.pinyin)             # 'Hua2 tie3 lu2'

With custom whitelist:

from pathlib import Path
lookup = DictionaryLookup(whitelist_path=Path("my_whitelist.yaml"))

lookup.py has zero external dependencies (stdlib only). The mcp dependency is only needed for the MCP server.

---

Install standalone (no MCP, just Python library)

pip install zh-dict-mcp

Or with uv:

uv add zh-dict-mcp

---

Limitations

• English-language definitions (CC-CEDICT is a Chinese-English dictionary). Works well with LLMs that handle cross-lingual judgment (Claude, GPT-4+, Gemini). For monolingual Chinese consumers you'd need a translation layer.
• Sense matching is on the caller — this tool returns all senses; deciding whether the speaker's intended sense matches a returned sense is left to the LLM or human reviewer.
• Single-word / single-phrase lookup — doesn't parse full sentences. Wrap with your own NLP layer for sentence-level work.
• 9.4 MB data bundle — CC-CEDICT data is included in the wheel for offline use.

---

How it fits with broader writing-quality pipelines

This tool is one piece of a larger "AI-generated text quality" framework. Typical usage flow:

LLM generates Chinese dialogue
   ↓
Scan for figurative expressions (比喻 / 借代 / 委婉 / ...)
   ↓
For each: lookup_dictionary(expression)
   ↓
  ├── found + sense matches intent → pass
  └── not found or sense mismatch → flag for rewrite

A reference review prompt for this flow is documented in Forgewright (the project that spawned this tool).

---

Project status

v0.1.0 — initial release. Validated on a 39-case test set covering 6 categories (dead metaphors / live metaphors / literal words / boundary cases / idioms / neologisms) with 100% accuracy.

Bug reports and PRs welcome.

License

• Code: MIT (see LICENSE)
• CC-CEDICT data: CC BY-SA 4.0 (see LICENSE-CC-CEDICT)