# Lettras word search (remote · mcp.lettras.org)

Word searches, crosswords, sudoku and Unicode text styles in 6 languages, accents kept.

- Trust score: 76/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `mcp.lettras.org`: 76/100 (this document), [markdown](https://verifymcp.io/servers/org-lettras-word-search/mcp.md), [page](https://verifymcp.io/servers/org-lettras-word-search/mcp)

## Channel facts

- Endpoint: `https://mcp.lettras.org/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.5.0`

## 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**: 66/100
  - 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 8 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.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 64/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1417 tokens (~177/item across 8 items; 8 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 83/100
  - Stability observed for 25 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 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Lettras word search MCP server?

Lettras word search is a hosted endpoint at https://mcp.lettras.org/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 org-lettras-word-search 'https://mcp.lettras.org/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "org-lettras-word-search": {
      "url": "https://mcp.lettras.org/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "org-lettras-word-search": {
      "type": "http",
      "url": "https://mcp.lettras.org/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.org-lettras-word-search]
url = "https://mcp.lettras.org/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "org-lettras-word-search": {
      "type": "remote",
      "url": "https://mcp.lettras.org/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add org-lettras-word-search --url 'https://mcp.lettras.org/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  org-lettras-word-search:
    url: "https://mcp.lettras.org/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "org-lettras-word-search": {
      "Transport": "http",
      "Url": "https://mcp.lettras.org/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add org-lettras-word-search -t streamable-http -u 'https://mcp.lettras.org/mcp'
```

### Other

```json
{
  "mcpServers": {
    "org-lettras-word-search": {
      "type": "http",
      "url": "https://mcp.lettras.org/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.

### 2026-11-04 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-25 (score 71, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-22 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-20 (score 69, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (8)

### `generate_word_search` (~305 tokens)

Generate a word search

Create a word-search puzzle (sopa de letras) from a list of words. Puzzles up to 10x10 with at most 10 words are free and unlimited; bigger ones use the free puzzles each client gets. Keeps native letters (Ñ, Ç, Ã, Ä, ẞ, È…) as one cell each. Returns the grid, where every word is hidden, and any words that did not fit. Empty cells are marked "-": call fill_word_search with the grid to complete it with random letters. The same seed always gives the same puzzle.

Input parameters:

- `classicMode` (boolean): Strip accents in the grid (ñ becomes N).
- `clustering` (number): 0 keeps words apart, 1 makes them cross. Default 0.5.
- `cols` (integer, required): Grid width. May differ from rows for a rectangular grid.
- `difficulty` (integer): Used when position is not set: 1 easy (right, down) to 4 expert (all 8 directions).
- `lang` (string): Language of the words. Default es.
- `position` (string): horizontal = left to right only, vertical = top to bottom only, mixed = all 8 directions including diagonals.
- `rows` (integer, required): Grid height.
- `seed` (integer): Repeatable puzzles: same input and seed, same grid.
- `words` (array, required): Words to hide, in their normal spelling (accents kept).

### `fill_word_search` (~201 tokens)

Fill a word search with random letters

Completes a word search: takes the grid from generate_word_search (empty cells are "-") and fills them with random letters in the chosen language, with accents on or off. Letters follow how common they are in that language. Pass the puzzle's words so the filler never creates an extra copy of one.

Input parameters:

- `accents` (boolean): true (default): use the language's accented/native letters (Ñ, Ç, Ã, Ä, ẞ…). false: plain A-Z only.
- `empty` (string): What marks an empty cell. Default "-".
- `grid` (array, required): The grid from generate_word_search: rows of one-letter strings, "-" for empty cells.
- `lang` (string): Language of the letters. Default es.
- `seed` (integer): Repeatable filler. Omit for a different filler every time.
- `words` (array): The hidden words, so the filler cannot create an extra copy of one.

### `stylize_text` (~257 tokens)

Write text in Unicode styles

Turns text into Unicode styles for social media bios and posts: bold, italic, script, fraktur, monospace, circled, squared, fullwidth, small caps, strikethrough, underline and more (22 styles). Accents are kept: an accented letter becomes its styled base letter plus the combining accent (ñ, ç, ü, ß work). Not every style can draw every character: letters such as ß, Æ, Œ, Ø or non-Latin scripts stay plain, and accented letters rely on a combining mark that some fonts draw badly. Those characters are listed in notNative for each style, and parts with missing: true mark them, so you can warn the user or show an empty box. Set classic to strip accents first. Pass one style id, several, or none for all styles (see list_styles). Runs locally and has no usage limit.

Input parameters:

- `classic` (boolean): Strip accents first (ñ becomes n), for places that render combining accents badly.
- `style`: Which style(s) to use. Omit for all 22. Ids come from list_styles.
- `text` (string, required): The text to style, in its normal spelling (accents kept).

### `list_styles` (~48 tokens)

List text styles

The Unicode text styles stylize_text offers, with the id to pass, an English name and a category (bold-italic, sans, script, gothic, mono, enclosed, decoration, other).

### `crossword` (~303 tokens)

Generate a crossword (crucigrama)

Lays out a crossword from words with clues. Returns two matrices of the same size: puzzle (the game position: "-" is a blank cell, a word's number is on its first cell, "0" marks the other cells where a letter goes, and "a/d" such as "3/4" appears when an across word and a down word start in the same cell) and solution (the same matrix with the correct letters, one grapheme per cell). placements lists every word with its number, clue, direction (across/down) and start cell; unplaced lists words that did not fit. Offer more words than you need: the engine keeps the best layout it finds. Native letters (Ñ, Ç, ẞ…) stay one cell each. Free, no usage limit. The same seed gives the same crossword.

Input parameters:

- `attempts` (integer): Layouts to try (default 30); more attempts, denser crossword.
- `block` (string): Marker of blank cells. Default "-".
- `classicMode` (boolean): Strip accents (ñ becomes N).
- `cols` (integer): Largest width. Default: rows.
- `entries` (array, required): Words with their clues.
- `open` (string): Marker of letter cells that do not start a word in puzzle. Default "0".
- `rows` (integer, required): Largest height; the result is cropped to what it uses.
- `seed` (integer): Repeatable crossword.

### `sudoku` (~114 tokens)

Generate a sudoku

Creates a sudoku with exactly one solution. Returns puzzle (0 = empty cell) and solution. Sizes 4, 6, 9 (default), 12 and 16; difficulty 1 easy (most clues) to 4 expert. Free, no usage limit. The same seed gives the same sudoku.

Input parameters:

- `difficulty` (integer): 1 easy to 4 expert. Default 2.
- `seed` (integer): Repeatable sudoku.
- `size` (integer): Side of the grid. Default 9.

### `solve_sudoku` (~68 tokens)

Solve a sudoku

Solves a sudoku grid (0 = empty cell; sizes 4, 6, 9, 12, 16) and says whether the solution is the only one. Free, no usage limit.

Input parameters:

- `puzzle` (array, required): Rows of numbers, 0 for empty cells.

### `list_languages` (~25 tokens)

List supported languages

Languages Lettras supports, with the native letters each one adds to its grid alphabet.

## Diagnostics

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

## Score history

- 2026-11-05: 76
- 2026-11-04: 76
- 2026-11-03: 75
- 2026-11-02: 75
- 2026-11-01: 74
- 2026-10-31: 74
- 2026-10-30: 73
- 2026-10-29: 73
- 2026-10-28: 72
- 2026-10-27: 72
- 2026-10-26: 71
- 2026-10-25: 71
- 2026-10-24: 70
- 2026-10-23: 70
- 2026-10-22: 70
- 2026-10-21: 69
- 2026-10-20: 69
- 2026-10-19: 68
- 2026-10-18: 68
- 2026-10-17: 67
- 2026-10-16: 67
- 2026-10-15: 66
- 2026-10-14: 66
- 2026-10-13: 65
- 2026-10-12: 65
- 2026-10-11: 64

## Common questions

### What is the Lettras word search MCP server?

Lettras word search is an MCP server listed in the public MCP registry as org.lettras/word-search. Word searches, crosswords, sudoku and Unicode text styles in 6 languages, accents kept. This page covers its hosted endpoint (https://mcp.lettras.org/mcp).

### Is the Lettras word search MCP server safe to use?

Lettras word search scores 76 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 Lettras word search MCP server expose?

Lettras word search exposes 8 tools: generate_word_search, fill_word_search, stylize_text, list_styles, crossword, and 3 more. Their descriptions and schemas cost roughly 1,321 tokens of context every time the server is loaded.

### Does the Lettras word search MCP server require authentication?

No. We connected to Lettras word search without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Lettras word search MCP server still maintained?

Lettras word search 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://mcp.lettras.org/mcp
- Repository: https://github.com/Artificialss/lettras-sdk
- Changelog RSS feed: https://verifymcp.io/servers/org-lettras-word-search/mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/org-lettras-word-search/mcp.json
- HTML version of this page: https://verifymcp.io/servers/org-lettras-word-search/mcp