get_item_recipe

Instructions

Implementation Reference

• src/tools/get-item-recipe.ts:108-198 (handler)

  The main handler function that queries the SQLite database for item information, processes recipes, and returns either the component details or build information.

  export function getItemRecipe(
    db: Database.Database,
    input: GetItemRecipeInputType,
  ): GetItemRecipeResult | GetItemRecipeError {
    const item = findItemByName(db, input.name);
  
    if (!item) {
      const suggestions = getSuggestions(db, input.name);
      return {
        error: `Item "${input.name}" not found.`,
        suggestions,
      };
    }
  
    const detail = rowToDetail(item);
  
    // Completed item (has composition) — show its component recipe
    if (item.composition && item.isComponent === 0) {
      let componentApiNames: string[] = [];
      try {
        componentApiNames = JSON.parse(item.composition) as string[];
      } catch {
        // empty
      }
  
      const components: ItemDetail[] = [];
      for (const apiName of componentApiNames) {
        const compRow = db
          .prepare('SELECT * FROM items WHERE apiName = ?')
          .get(apiName) as ItemRow | undefined;
        if (compRow) {
          components.push(rowToDetail(compRow));
        }
      }
  
      return {
        result: {
          item: detail,
          components,
        },
      };
    }
  
    // Component item — show all completed items that use this component (reverse lookup)
    const completedRows = db
      .prepare(
        "SELECT * FROM items WHERE isComponent = 0 AND composition LIKE '%' || ? || '%'",
      )
      .all(item.apiName) as ItemRow[];
  
    const buildsInto: Array<{ item: ItemDetail; otherComponent: ItemDetail }> = [];
    for (const completedRow of completedRows) {
      let compApiNames: string[] = [];
      try {
        compApiNames = JSON.parse(completedRow.composition ?? '[]') as string[];
      } catch {
        // empty
      }
  
      // Find the other component (the one that isn't this item)
      const otherApiName = compApiNames.find((a) => a !== item.apiName) ?? compApiNames[0];
      let otherComponent: ItemDetail | null = null;
      if (otherApiName) {
        const otherRow = db
          .prepare('SELECT * FROM items WHERE apiName = ?')
          .get(otherApiName) as ItemRow | undefined;
        if (otherRow) {
          otherComponent = rowToDetail(otherRow);
        }
      }
  
      if (otherComponent) {
        buildsInto.push({
          item: rowToDetail(completedRow),
          otherComponent,
        });
      } else {
        buildsInto.push({
          item: rowToDetail(completedRow),
          otherComponent: detail, // self-combine (e.g. two of same component)
        });
      }
    }
  
    return {
      result: {
        item: detail,
        buildsInto,
      },
    };
  }

• src/tools/get-item-recipe.ts:6-8 (schema)

  Zod schema for the 'get_item_recipe' tool input, requiring a name string.

  export const GetItemRecipeInput = z.object({
    name: z.string().describe('Item name to look up (e.g. "Infinity Edge", "B.F. Sword")'),
  });

• src/server.ts:147-156 (registration)

  The tool 'get_item_recipe' is registered and invoked here, connecting the input validation to the handler and formatting the output.

  // 6. get_item_recipe
  server.tool(
    'get_item_recipe',
    'Get the recipe for a TFT item (which components build it) or see what a component builds into. Use this for item planning and carousel decisions.',
    GetItemRecipeInput.shape,
    async (params) => {
      try {
        const result = getItemRecipe(db, params);
        return {
          content: [{ type: 'text' as const, text: formatGetItemRecipe(result) }],