diff --git a/src/fastmcp/server/auth/providers/jwt.py b/src/fastmcp/server/auth/providers/jwt.py
index b03463ee8..1d6f4baa4 100644
--- a/src/fastmcp/server/auth/providers/jwt.py
+++ b/src/fastmcp/server/auth/providers/jwt.py
@@ -193,19 +193,19 @@ class JWTVerifier(TokenVerifier):
         base_url: AnyHttpUrl | str | NotSetT | None = NotSet,
     ):
         """
-        Initialize the JWT token verifier.
+        Initialize a JWTVerifier configured to validate JWTs using either a static key or a JWKS endpoint.
 
-        Args:
-            public_key: For asymmetric algorithms (RS256, ES256, etc.): PEM-encoded public key.
-                       For symmetric algorithms (HS256, HS384, HS512): The shared secret string.
-            jwks_uri: URI to fetch JSON Web Key Set (only for asymmetric algorithms)
-            issuer: Expected issuer claim
-            audience: Expected audience claim(s)
-            algorithm: JWT signing algorithm. Supported algorithms:
-                      - Asymmetric: RS256/384/512, ES256/384/512, PS256/384/512 (default: RS256)
-                      - Symmetric: HS256, HS384, HS512
-            required_scopes: Required scopes for all tokens
-            base_url: Base URL for TokenVerifier protocol
+        Parameters:
+            public_key (str | NotSetT | None): PEM-encoded public key for asymmetric algorithms or shared secret for symmetric algorithms.
+            jwks_uri (str | NotSetT | None): URI to fetch a JSON Web Key Set; used when verifying tokens with remote JWKS.
+            issuer (str | list[str] | NotSetT | None): Expected issuer claim value or list of allowed issuer values.
+            audience (str | list[str] | NotSetT | None): Expected audience claim value or list of allowed audience values.
+            algorithm (str | NotSetT | None): JWT signing algorithm to accept (default: "RS256"). Supported: HS256/384/512, RS256/384/512, ES256/384/512, PS256/384/512.
+            required_scopes (list[str] | NotSetT | None): Scopes that must be present in validated tokens.
+            base_url (AnyHttpUrl | str | NotSetT | None): Base URL passed to the parent TokenVerifier.
+
+        Raises:
+            ValueError: If neither or both of `public_key` and `jwks_uri` are provided, or if `algorithm` is unsupported.
         """
         settings = JWTVerifierSettings.model_validate(
             {
@@ -366,13 +366,13 @@ class JWTVerifier(TokenVerifier):
 
     async def load_access_token(self, token: str) -> AccessToken | None:
         """
-        Validates the provided JWT bearer token.
+        Validate a JWT bearer token and return an AccessToken when the token is valid.
 
-        Args:
-            token: The JWT token string to validate
+        Parameters:
+            token (str): The JWT bearer token string to validate.
 
         Returns:
-            AccessToken object if valid, None if invalid or expired
+            AccessToken | None: An AccessToken populated from token claims if the token is valid; `None` if the token is expired, has an invalid signature or format, fails issuer/audience/scope validation, or any other validation error occurs.
         """
         try:
             # Get verification key (static or from JWKS)