diff --git a/commons/pom.xml b/commons/pom.xml
index 75cf2819..141d4256 100644
--- a/commons/pom.xml
+++ b/commons/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>io.polyapi</groupId>
         <artifactId>parent-pom</artifactId>
-        <version>0.15.5-SNAPSHOT</version>
+        <version>0.15.6-SNAPSHOT</version>
         <relativePath>../parent-pom</relativePath>
     </parent>
 
diff --git a/library/pom.xml b/library/pom.xml
index f02dd9a3..17a60586 100644
--- a/library/pom.xml
+++ b/library/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>io.polyapi</groupId>
         <artifactId>parent-pom</artifactId>
-        <version>0.15.5-SNAPSHOT</version>
+        <version>0.15.6-SNAPSHOT</version>
         <relativePath>../parent-pom</relativePath>
     </parent>
     <artifactId>library</artifactId>
diff --git a/parent-pom/pom.xml b/parent-pom/pom.xml
index b2ae77e0..b7e6bc64 100644
--- a/parent-pom/pom.xml
+++ b/parent-pom/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>io.polyapi</groupId>
     <artifactId>parent-pom</artifactId>
-    <version>0.15.5-SNAPSHOT</version>
+    <version>0.15.6-SNAPSHOT</version>
     <packaging>pom</packaging>
     <name>PolyAPI Java parent POM</name>
     <url>https://polyapi.io</url>
diff --git a/polyapi-maven-plugin/pom.xml b/polyapi-maven-plugin/pom.xml
index 56871939..449bc724 100644
--- a/polyapi-maven-plugin/pom.xml
+++ b/polyapi-maven-plugin/pom.xml
@@ -4,7 +4,7 @@
     <parent>
         <groupId>io.polyapi</groupId>
         <artifactId>parent-pom</artifactId>
-        <version>0.15.5-SNAPSHOT</version>
+        <version>0.15.6-SNAPSHOT</version>
         <relativePath>../parent-pom</relativePath>
     </parent>
     <artifactId>polyapi-maven-plugin</artifactId>
diff --git a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/mojo/GenerateSourcesMojo.java b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/mojo/GenerateSourcesMojo.java
index 00e17a62..338ed83d 100644
--- a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/mojo/GenerateSourcesMojo.java
+++ b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/mojo/GenerateSourcesMojo.java
@@ -22,17 +22,25 @@ public class GenerateSourcesMojo extends PolyApiMojo {
     @Parameter(property = "overwrite", defaultValue = "false")
     private Boolean overwrite;
 
-    @Parameter(property = "context")
-    private String context;
+    @Parameter(property = "contexts")
+    private String contexts;
+    
+    @Parameter(property = "functionIds")
+    private String functionIds;
+
     private PolyGenerationService polyGenerationService;
 
     @Override
     public void execute(String host, Integer port) {
         log.info("Initiating generation of Poly sources.");
         this.polyGenerationService = new PolyGenerationServiceImpl(getHttpClient(), getJsonParser(), host, port, getTokenProvider().getToken());
-        List<String> contextFilters = Arrays.stream(Optional.ofNullable(context).map(contextCsv -> contextCsv.split(",")).orElse(new String[]{""})).toList();
+        List<String> contextFilters = Arrays.stream(Optional.ofNullable(contexts).map(contextCsv -> contextCsv.split(",")).orElse(new String[]{""})).toList();
         log.debug("Context filters: \"{}\"", join("\", \"", contextFilters));
-        this.polyGenerationService.generate(contextFilters, overwrite);
+       
+        List<String> functionIdFilters = Arrays.stream(Optional.ofNullable(functionIds).map(functionIdsCsv -> functionIdsCsv.split(",")).orElse(new String[]{""})).toList();
+        log.debug("Function ID filters: \"{}\"", join("\", \"", functionIdFilters));
+        
+        this.polyGenerationService.generate(contextFilters, functionIdFilters, overwrite);
         log.info("Poly generation complete.");
     }
 }
diff --git a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/PolyFunctionServiceImpl.java b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/PolyFunctionServiceImpl.java
index f5962d9a..a06a4a69 100644
--- a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/PolyFunctionServiceImpl.java
+++ b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/PolyFunctionServiceImpl.java
@@ -8,6 +8,7 @@
 import io.polyapi.plugin.model.specification.Specification;
 import lombok.extern.slf4j.Slf4j;
 
+import java.util.Collections;
 import java.util.List;
 
 import static java.lang.String.format;
@@ -32,7 +33,7 @@ public PolyFunction deploy(String type, PolyFunction polyFunction) {
     @Override
     public void delete(String context, String name) {
         log.info("Deleting function '{}' on context '{}'.", name, context);
-        List<Specification> specifications = specificationService.list(List.of())
+        List<Specification> specifications = specificationService.list(List.of(context), Collections.emptyList())
                 .stream()
                 .filter(spec -> spec.getName().equalsIgnoreCase(name) && spec.getContext().equalsIgnoreCase(context))
                 .toList();
@@ -54,7 +55,7 @@ public void delete(String context, String name) {
 
     @Override
     public void delete(String id) {
-        specificationService.list(List.of()).stream()
+        specificationService.list(Collections.emptyList(), List.of(id)).stream()
                 .filter(specification -> specification.getId().equals(id))
                 .forEach(this::delete);
     }
diff --git a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/SpecificationService.java b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/SpecificationService.java
index 33150d76..684bbe87 100644
--- a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/SpecificationService.java
+++ b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/SpecificationService.java
@@ -12,8 +12,9 @@ public interface SpecificationService {
     /**
      * Retrieve all the JSON specifications in Poly.
      *
-     * @param context The contexts that should be used to filter the specifications.
+     * @param contexts The contexts that should be used to filter the specifications.
+     * @param functionIdFilters A list of function/specification IDs to filter by. Can be empty.
      * @return String A JSON containing the specifications.
      */
-    List<Specification> list(List<String> context);
+    List<Specification> list(List<String> contexts, List<String> functionIdFilters);
 }
diff --git a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/SpecificationServiceImpl.java b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/SpecificationServiceImpl.java
index 0f84b359..aea35803 100644
--- a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/SpecificationServiceImpl.java
+++ b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/SpecificationServiceImpl.java
@@ -12,6 +12,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.StringJoiner;
 import java.util.function.Predicate;
 
 import static com.fasterxml.jackson.databind.type.TypeFactory.defaultInstance;
@@ -27,36 +28,32 @@ public SpecificationServiceImpl(HttpClient client, JsonParser jsonParser, String
     }
 
     @Override
-    public List<Specification> list(List<String> contextFilters) {
+    public List<Specification> list(List<String> contextFilters, List<String> functionIdFilters) {
         log.info("Retrieving JSON specifications from PolyAPI for this user.");
-        List<Specification> specifications = get("specs", defaultInstance().constructCollectionType(List.class, Specification.class));
-        log.debug("{} specifications retrieved without filter.", specifications.size());
-        if (log.isDebugEnabled()) {
+        
+        // Build the query parameter string for server-side filtering
+        StringJoiner queryParams = new StringJoiner("&");
+        if (contextFilters != null && !contextFilters.isEmpty()) {
+            queryParams.add("contexts=" + String.join(",", contextFilters));
+        }
+        if (functionIdFilters != null && !functionIdFilters.isEmpty()) {
+            queryParams.add("ids=" + String.join(",", functionIdFilters));
+        }
+
+        String path = "specs";
+        if (queryParams.length() > 0) {
+            path += "?" + queryParams.toString();
+            log.info("Applying server-side filters: {}", queryParams.toString());
+        }
+
+        // Make the API call with the constructed path
+        List<Specification> specifications = get(path, defaultInstance().constructCollectionType(List.class, Specification.class));
+
+        if (log.isTraceEnabled()) {
             log.trace("Retrieved specifications with the following IDs: [{}]", specifications.stream().map(Specification::getId).collect(joining(", ")));
         }
-        log.debug("Validating for duplicate context/name pairs and filtering specification contexts.");
-        Map<String, Specification> filteredMap = new HashMap<>();
-        specifications.stream()
-                .filter(not(IgnoredSpecification.class::isInstance))
-                .filter(specification -> {
-                    String context = specification.getContext().trim().toLowerCase();
-                    return contextFilters.isEmpty() || contextFilters.stream()
-                            .map(String::trim)
-                            .map(String::toLowerCase)
-                            .anyMatch(contextFilter -> contextFilter.equalsIgnoreCase(context) || contextFilter.isEmpty() || context.startsWith(format("%s.", contextFilter)));
-                })
-                .filter(not(specification -> specification instanceof ClientFunctionSpecification clientFunctionSpecification && !clientFunctionSpecification.getLanguage().equalsIgnoreCase("java")))
-                .forEach(specification -> {
-            String key = format("%s.%s", specification.getContext(), specification.getName()).toLowerCase();
-            if (filteredMap.containsKey(key)) {
-                log.warn("Skipping {} specification '{}' in context '{}' as it clashes with {} specification with the same name and context.", specification.getType(), specification.getName(), specification.getContext(), filteredMap.get(key).getType());
-            } else {
-                log.debug("Specification key '{}' not repeated (yet).", key);
-                filteredMap.put(key, specification);
-            }
-        });
-        List<Specification> result = filteredMap.values().stream().toList();
-        log.info("{} specifications retrieved.", result.size());
-        return result;
+
+        log.info("{} specifications retrieved after server-side filtering.", specifications.size());
+        return specifications;
     }
 }
diff --git a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/generation/PolyGenerationService.java b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/generation/PolyGenerationService.java
index e3f188ec..17692aa9 100644
--- a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/generation/PolyGenerationService.java
+++ b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/generation/PolyGenerationService.java
@@ -4,5 +4,5 @@
 
 public interface PolyGenerationService {
 
-    void generate(List<String> contextFilters, boolean overwrite);
+    void generate(List<String> contextFilters, List<String> functionIdFilters, boolean overwrite);
 }
diff --git a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/generation/PolyGenerationServiceImpl.java b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/generation/PolyGenerationServiceImpl.java
index 09d02d14..60bf5484 100644
--- a/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/generation/PolyGenerationServiceImpl.java
+++ b/polyapi-maven-plugin/src/main/java/io/polyapi/plugin/service/generation/PolyGenerationServiceImpl.java
@@ -50,8 +50,12 @@ public PolyGenerationServiceImpl(HttpClient httpClient, JsonParser jsonParser, S
     }
 
     @Override
-    public void generate(List<String> contextFilters, boolean overwrite) {
-        var specifications = specificationService.list(contextFilters);
+    public void generate(List<String> contextFilters, List<String> functionIdFilters, boolean overwrite) {
+        // The call to list now passes both filters for server-side processing.
+        log.info("Applying context  filters on the API call: {}", contextFilters);
+        log.info("Applying function ID filters on the API call: {}", functionIdFilters);
+        var specifications = specificationService.list(contextFilters, functionIdFilters);
+
         var contextModel = new HashMap<String, Object>();
         contextModel.put("clientId", UUID.randomUUID().toString());
         contextModel.put("host", host);
diff --git a/pom.xml b/pom.xml
index 4a5ee6c7..60c23271 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>io.polyapi</groupId>
     <artifactId>polyapi-java</artifactId>
-    <version>0.15.5-SNAPSHOT</version>
+    <version>0.15.6-SNAPSHOT</version>
     <packaging>pom</packaging>
     <modules>
         <module>parent-pom</module>