diff --git a/README.md b/README.md
index 837a06f..4890a08 100644
--- a/README.md
+++ b/README.md
@@ -157,7 +157,7 @@ Add this to your Claude Desktop `claude_desktop_config.json` file. See [Claude D
 - `get-library-docs`: Fetches documentation for a library using a Context7-compatible library ID.
   - `context7CompatibleLibraryID` (required)
   - `topic` (optional): Focus the docs on a specific topic (e.g., "routing", "hooks")
-  - `tokens` (optional, default 5000): Max number of tokens to return
+  - `tokens` (optional, default 5000): Max number of tokens to return. Values less than 5000 are automatically increased to 5000.
 
 ## Development
 
diff --git a/src/index.ts b/src/index.ts
index 19d88dc..0111f5e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -81,9 +81,7 @@ server.tool(
       .describe("Topic to focus documentation on (e.g., 'hooks', 'routing')."),
     tokens: z
       .preprocess((val) => (typeof val === "string" ? Number(val) : val), z.number())
-      .refine((val) => typeof val === "number" && val >= DEFAULT_MINIMUM_TOKENS, {
-        message: `Must be a number >= ${DEFAULT_MINIMUM_TOKENS}`,
-      })
+      .transform((val) => (val < DEFAULT_MINIMUM_TOKENS ? DEFAULT_MINIMUM_TOKENS : val))
       .optional()
       .describe(
         `Maximum number of tokens of documentation to retrieve (default: ${DEFAULT_MINIMUM_TOKENS}). Higher values provide more context but consume more tokens.`