{"openapi":"3.1.0","info":{"title":"Hex Play API","version":"0.1.0","description":"A real, stateless, playable Hex-style connection game engine (correct 6-neighbor adjacency, union-find based win detection) with a genuine shortest-bridge (Dijkstra) heuristic AI opponent (easy/medium/hard difficulty). Every tool call takes the full game state and returns the new state; nothing is stored server-side.\n\nEvery operation is read-only or compute-only. The same tools are available over MCP (streamable HTTP) at https://hexplay.connectorbay.com/mcp.","contact":{"name":"Unify Dynamics LLC","email":"hr@unifydynamics.com","url":"https://connectorbay.com/hexplay/docs"},"termsOfService":"https://connectorbay.com/hexplay/terms"},"servers":[{"url":"https://hexplay.connectorbay.com"}],"externalDocs":{"url":"https://connectorbay.com/hexplay/docs"},"security":[{},{"bearer":[]}],"components":{"securitySchemes":{"bearer":{"type":"http","scheme":"bearer","description":"Optional. A Pro API key raises rate limits; no credentials are required."}},"schemas":{"Error":{"type":"object","properties":{"ok":{"const":false},"error":{"type":"object"}}}}},"paths":{"/v1/tools/new_game":{"post":{"operationId":"new_game","summary":"Starts a fresh Hex-style game on an empty size x size rhombus board and returns its initial","description":"Starts a fresh Hex-style game on an empty size x size rhombus board and returns its initial\n    state. Use for \"let's play a hex connection game\", \"start a new game\".","tags":["tools"],"requestBody":{"required":true,"content":{"application/json":{"schema":{"properties":{"size":{"default":11,"description":"Board side length (default 11).","maximum":19,"minimum":3,"title":"Size","type":"integer"},"first_player":{"default":"R","description":"Which side moves first.","examples":["R","B"],"title":"First Player","type":"string"}},"title":"new_gameArguments","type":"object"}}}},"responses":{"200":{"description":"Tool result. `ok: true` on success; `ok: false` with a structured `error` (provider_unavailable, upstream_error, bad_input) when the tool could not answer.","content":{"application/json":{"schema":{"type":"object","additionalProperties":true}}}},"422":{"description":"Arguments failed validation","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}},"429":{"description":"Rate limit exceeded (see Retry-After)","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}}},"x-read-only":true}},"/v1/tools/make_move":{"post":{"operationId":"make_move","summary":"Places a stone for the state's current_player and returns the resulting state. status is","description":"Places a stone for the state's current_player and returns the resulting state. status is\n    invalid_move (illegal — state unchanged), in_progress, win (winner is 'R' or 'B'), or draw\n    (board full with no winner — not expected in correct Hex play, guarded defensively). Use for\n    \"place a stone at row 5, column 5\", \"play square 60\".","tags":["tools"],"requestBody":{"required":true,"content":{"application/json":{"schema":{"properties":{"state":{"additionalProperties":true,"description":"The current game state, exactly as returned by new_game/make_move.","examples":[{"board":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"current_player":"R","size":11}],"title":"State","type":"object"},"index":{"anyOf":[{"minimum":0,"type":"integer"},{"type":"null"}],"default":null,"description":"Flat cell index: row*size+col.","title":"Index"},"row":{"anyOf":[{"minimum":0,"type":"integer"},{"type":"null"}],"default":null,"description":"Row (0 at top). Use with col instead of index.","title":"Row"},"col":{"anyOf":[{"minimum":0,"type":"integer"},{"type":"null"}],"default":null,"description":"Column (0 at left). Use with row instead of index.","title":"Col"}},"required":["state"],"title":"make_moveArguments","type":"object"}}}},"responses":{"200":{"description":"Tool result. `ok: true` on success; `ok: false` with a structured `error` (provider_unavailable, upstream_error, bad_input) when the tool could not answer.","content":{"application/json":{"schema":{"type":"object","additionalProperties":true}}}},"422":{"description":"Arguments failed validation","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}},"429":{"description":"Rate limit exceeded (see Retry-After)","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}}},"x-read-only":true}},"/v1/tools/get_valid_moves":{"post":{"operationId":"get_valid_moves","summary":"Lists empty squares (flat indices); empty once the game has ended. Use for \"what squares are","description":"Lists empty squares (flat indices); empty once the game has ended. Use for \"what squares are\n    open\".","tags":["tools"],"requestBody":{"required":true,"content":{"application/json":{"schema":{"properties":{"state":{"additionalProperties":true,"description":"The current game state, exactly as returned by new_game/make_move.","examples":[{"board":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"current_player":"R","size":11}],"title":"State","type":"object"}},"required":["state"],"title":"get_valid_movesArguments","type":"object"}}}},"responses":{"200":{"description":"Tool result. `ok: true` on success; `ok: false` with a structured `error` (provider_unavailable, upstream_error, bad_input) when the tool could not answer.","content":{"application/json":{"schema":{"type":"object","additionalProperties":true}}}},"422":{"description":"Arguments failed validation","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}},"429":{"description":"Rate limit exceeded (see Retry-After)","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}}},"x-read-only":true}},"/v1/tools/render":{"post":{"operationId":"render","summary":"A human-readable ASCII rhombus board (each row shifted to show the true hex geometry). Use","description":"A human-readable ASCII rhombus board (each row shifted to show the true hex geometry). Use\n    for \"show me the board\".","tags":["tools"],"requestBody":{"required":true,"content":{"application/json":{"schema":{"properties":{"state":{"additionalProperties":true,"description":"The current game state, exactly as returned by new_game/make_move.","examples":[{"board":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"current_player":"R","size":11}],"title":"State","type":"object"}},"required":["state"],"title":"renderArguments","type":"object"}}}},"responses":{"200":{"description":"Tool result. `ok: true` on success; `ok: false` with a structured `error` (provider_unavailable, upstream_error, bad_input) when the tool could not answer.","content":{"application/json":{"schema":{"type":"object","additionalProperties":true}}}},"422":{"description":"Arguments failed validation","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}},"429":{"description":"Rate limit exceeded (see Retry-After)","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}}},"x-read-only":true}},"/v1/tools/ai_move":{"post":{"operationId":"ai_move","summary":"Chooses the AI's next stone placement for whichever side is currently to move, WITHOUT","description":"Chooses the AI's next stone placement for whichever side is currently to move, WITHOUT\n    applying it — call make_move with the returned index (or row/col) to actually play it. Use for\n    \"make the computer's move\", \"play as the AI on hard\".","tags":["tools"],"requestBody":{"required":true,"content":{"application/json":{"schema":{"properties":{"state":{"additionalProperties":true,"description":"The current game state, exactly as returned by new_game/make_move.","examples":[{"board":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"current_player":"R","size":11}],"title":"State","type":"object"},"difficulty":{"default":"hard","description":"easy, medium, or hard (default). A shortest-bridge (Dijkstra) heuristic, not minimax — see the server description for why.","title":"Difficulty","type":"string"}},"required":["state"],"title":"ai_moveArguments","type":"object"}}}},"responses":{"200":{"description":"Tool result. `ok: true` on success; `ok: false` with a structured `error` (provider_unavailable, upstream_error, bad_input) when the tool could not answer.","content":{"application/json":{"schema":{"type":"object","additionalProperties":true}}}},"422":{"description":"Arguments failed validation","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}},"429":{"description":"Rate limit exceeded (see Retry-After)","content":{"application/json":{"schema":{"$ref":"#/components/schemas/Error"}}}}},"x-read-only":true}}}}