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LetterLab Word Solver

Server Details

Word game solver & unscrambler

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Status
Healthy
Last Tested
Transport
Streamable HTTP · MCP 2025-11-25
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TDQS

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Available Tools

3 tools
solve_anagramUnscramble letters
Read-onlyIdempotent
Inspect

Use this when the user wants to unscramble letters or find all words that can be made from a set of letters (word unscrambler, anagram solver, letter-tile word finder), optionally with blank tiles (? or *) and filters for length, starts with, ends with, or contains. Returns dictionary matches grouped by length with counts (every match is counted; up to 25 words are listed per length) and tile points (standard letter values, no board bonuses). Does not check board placement or define words. Do not use for crossword patterns with known letter positions (use solve_word_pattern).

ParametersJSON Schema
NameRequiredDescriptionDefault
lengthNoOnly words of exactly this many letters, e.g. 5.
lettersYesThe letters to unscramble, e.g. RETAINS. Use ? or * for each blank (wildcard) tile, e.g. QUIZ?ES. Spaces and case are ignored; 2-20 tiles, at most 3 blanks.
containsNoOnly words that contain this run of letters, e.g. QU.
ends_withNoOnly words that end with these letters, e.g. ING.
min_lengthNoShortest word length to include, e.g. 3 (default 2).
starts_withNoOnly words that start with these letters, e.g. RE.
use_all_lettersNotrue to list only words that use every tile (full anagrams), e.g. true for 'what words use all of LISTEN'.

Output Schema

ParametersJSON Schema
NameRequiredDescription
modeYes
noteYes
shownYes
totalYes
blanksYes
groupsYes
filtersYes
lettersYes
top_scoringYes
common_totalYes
full_anagramsYes
solve_word_guessNarrow down a word guess
Read-onlyIdempotent
Inspect

Use this when the user plays a 5-letter word guessing game with green/yellow/gray feedback and wants the remaining possible answers or a strong next guess (word game solver, guess helper). Takes previous guesses with their color feedback (G/Y/-), applies the standard repeated-letter rules, counts the words still possible and lists up to 60 of them, and ranks next guesses by expected information. Supports 4-8 letter variants and hard mode. Does not know today's answer and does not play the game. Do not use for unscrambling letters or crossword patterns.

ParametersJSON Schema
NameRequiredDescriptionDefault
guessesNoGuesses made so far with their color feedback, in order, e.g. [{"word":"CRANE","feedback":"-Y--G"}]. Leave empty for a suggested opening guess.
hard_modeNotrue if every next guess must use all revealed clues (hard mode); then only words that could still be the answer are suggested.
word_lengthNoLetters in the hidden word, e.g. 5 (default: length of the guesses, else 5).

Output Schema

ParametersJSON Schema
NameRequiredDescription
modeYes
moreYes
noteYes
cluesYes
totalYes
solvedYes
guessesYes
candidatesYes
word_lengthYes
best_guessesYes
common_totalYes
guesses_scoredYes
scored_againstYes
solve_word_patternFind words by pattern
Read-onlyIdempotent
Inspect

Use this when the user needs words that fit a pattern of known and unknown letters, such as a crossword answer (C?T, _A_E, 7 letters ending in ING), with optional letters that must or must not appear. Counts every matching dictionary word and lists up to 120 of them, common words first. Does not solve clues by meaning or look up definitions. Do not use for unscrambling a set of letters (use solve_anagram).

ParametersJSON Schema
NameRequiredDescriptionDefault
lengthNoWord length when there is no pattern, or to check it, e.g. 7 for a 7-letter crossword answer.
patternNoKnown letters with ? (or _ or .) for each unknown letter and * for any run of letters, e.g. C?T, _A_E, ??ANGE, or S*ING. Spaces are ignored.
exclude_lettersNoLetters that must not appear anywhere, e.g. AEIO.
include_lettersNoLetters that must appear somewhere (repeat a letter to require it twice), e.g. RS.

Output Schema

ParametersJSON Schema
NameRequiredDescription
modeYes
moreYes
noteYes
totalYes
wordsYes
filtersYes
patternYes
by_lengthYes
common_totalYes

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 3 tool updates
    • First observedsolve_anagram
    • First observedsolve_word_guess
    • First observedsolve_word_pattern

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