github · edburns · Apr 21, 2026 · Apr 20, 2026 · Apr 20, 2026 · Apr 21, 2026
diff --git a/.lastmerge b/.lastmerge
@@ -1 +1 @@
-c3fa6cbfb83d4a20b7912b1a17013d48f5a277a1
+922959f4a7b83509c3620d4881733c6c5677f00c
diff --git a/src/main/java/com/github/copilot/sdk/CopilotSession.java b/src/main/java/com/github/copilot/sdk/CopilotSession.java
@@ -460,6 +460,7 @@ public CompletableFuture<String> send(MessageOptions options) {
         request.setPrompt(options.getPrompt());
         request.setAttachments(options.getAttachments());
         request.setMode(options.getMode());
+        request.setRequestHeaders(options.getRequestHeaders());
 
         return rpc.invoke("session.send", request, SendMessageResponse.class).thenApply(SendMessageResponse::messageId);
     }
@@ -1552,6 +1553,51 @@ public CompletableFuture<Void> setModel(String model, String reasoningEffort) {
                 .thenApply(r -> null);
     }
 
+    /**
+     * Changes the model for this session with optional reasoning effort and
+     * capability overrides.
+     * <p>
+     * The new model takes effect for the next message. Conversation history is
+     * preserved.
+     *
+     * <pre>{@code
+     * session.setModel("claude-sonnet-4.5", null,
+     * 		new ModelCapabilitiesOverride().setSupports(new ModelCapabilitiesOverride.Supports().setVision(false)))
+     * 		.get();
+     * }</pre>
+     *
+     * @param model
+     *            the model ID to switch to (e.g., {@code "gpt-4.1"})
+     * @param reasoningEffort
+     *            reasoning effort level (e.g., {@code "low"}, {@code "medium"},
+     *            {@code "high"}, {@code "xhigh"}); {@code null} to use default
+     * @param modelCapabilities
+     *            per-property overrides for model capabilities; {@code null} to use
+     *            runtime defaults
+     * @return a future that completes when the model switch is acknowledged
+     * @throws IllegalStateException
+     *             if this session has been terminated
+     * @since 1.3.0
+     */
+    public CompletableFuture<Void> setModel(String model, String reasoningEffort,
+            com.github.copilot.sdk.json.ModelCapabilitiesOverride modelCapabilities) {
+        ensureNotTerminated();
+        SessionModelSwitchToParams.SessionModelSwitchToParamsModelCapabilities generatedCapabilities = null;
+        if (modelCapabilities != null) {
+            SessionModelSwitchToParams.SessionModelSwitchToParamsModelCapabilities.SessionModelSwitchToParamsModelCapabilitiesSupports supports = null;
+            if (modelCapabilities.getSupports() != null) {
+                var s = modelCapabilities.getSupports();
+                supports = new SessionModelSwitchToParams.SessionModelSwitchToParamsModelCapabilities.SessionModelSwitchToParamsModelCapabilitiesSupports(
+                        s.getVision(), s.getReasoningEffort());
+            }
+            generatedCapabilities = new SessionModelSwitchToParams.SessionModelSwitchToParamsModelCapabilities(supports,
+                    null);
+        }
+        return getRpc().model
+                .switchTo(new SessionModelSwitchToParams(sessionId, model, reasoningEffort, generatedCapabilities))
+                .thenApply(r -> null);
+    }
+
     /**
      * Changes the model for this session.
      * <p>

diff --git a/src/main/java/com/github/copilot/sdk/SessionRequestBuilder.java b/src/main/java/com/github/copilot/sdk/SessionRequestBuilder.java
@@ -115,13 +115,16 @@ static CreateSessionRequest buildCreateRequest(SessionConfig config, String sess
         request.setHooks(config.getHooks() != null && config.getHooks().hasHooks() ? true : null);
         request.setWorkingDirectory(config.getWorkingDirectory());
         request.setStreaming(config.isStreaming() ? true : null);
+        request.setIncludeSubAgentStreamingEvents(config.getIncludeSubAgentStreamingEvents());
         request.setMcpServers(config.getMcpServers());
         request.setCustomAgents(config.getCustomAgents());
         request.setAgent(config.getAgent());
         request.setInfiniteSessions(config.getInfiniteSessions());
         request.setSkillDirectories(config.getSkillDirectories());
         request.setDisabledSkills(config.getDisabledSkills());
         request.setConfigDir(config.getConfigDir());
+        request.setEnableConfigDiscovery(config.getEnableConfigDiscovery());
+        request.setModelCapabilities(config.getModelCapabilities());
 
         if (config.getCommands() != null && !config.getCommands().isEmpty()) {
             var wireCommands = config.getCommands().stream()
@@ -185,14 +188,17 @@ static ResumeSessionRequest buildResumeRequest(String sessionId, ResumeSessionCo
         request.setHooks(config.getHooks() != null && config.getHooks().hasHooks() ? true : null);
         request.setWorkingDirectory(config.getWorkingDirectory());
         request.setConfigDir(config.getConfigDir());
+        request.setEnableConfigDiscovery(config.getEnableConfigDiscovery());
         request.setDisableResume(config.isDisableResume() ? true : null);
         request.setStreaming(config.isStreaming() ? true : null);
+        request.setIncludeSubAgentStreamingEvents(config.getIncludeSubAgentStreamingEvents());
         request.setMcpServers(config.getMcpServers());
         request.setCustomAgents(config.getCustomAgents());
         request.setAgent(config.getAgent());
         request.setSkillDirectories(config.getSkillDirectories());
         request.setDisabledSkills(config.getDisabledSkills());
         request.setInfiniteSessions(config.getInfiniteSessions());
+        request.setModelCapabilities(config.getModelCapabilities());
 
         if (config.getCommands() != null && !config.getCommands().isEmpty()) {
             var wireCommands = config.getCommands().stream()

diff --git a/src/main/java/com/github/copilot/sdk/json/CreateSessionRequest.java b/src/main/java/com/github/copilot/sdk/json/CreateSessionRequest.java
@@ -67,8 +67,11 @@ public final class CreateSessionRequest {
     @JsonProperty("streaming")
     private Boolean streaming;
 
+    @JsonProperty("includeSubAgentStreamingEvents")
+    private Boolean includeSubAgentStreamingEvents;
+
     @JsonProperty("mcpServers")
-    private Map<String, Object> mcpServers;
+    private Map<String, McpServerConfig> mcpServers;
 
     @JsonProperty("envValueMode")
     private String envValueMode;
@@ -91,12 +94,18 @@ public final class CreateSessionRequest {
     @JsonProperty("configDir")
     private String configDir;
 
+    @JsonProperty("enableConfigDiscovery")
+    private Boolean enableConfigDiscovery;
+
     @JsonProperty("commands")
     private List<CommandWireDefinition> commands;
 
     @JsonProperty("requestElicitation")
     private Boolean requestElicitation;
 
+    @JsonProperty("modelCapabilities")
+    private ModelCapabilitiesOverride modelCapabilities;
+
     /** Gets the model name. @return the model */
     public String getModel() {
         return model;
@@ -240,12 +249,12 @@ public void setStreaming(Boolean streaming) {
     }
 
     /** Gets MCP servers. @return the servers map */
-    public Map<String, Object> getMcpServers() {
+    public Map<String, McpServerConfig> getMcpServers() {
         return mcpServers == null ? null : Collections.unmodifiableMap(mcpServers);
     }
 
     /** Sets MCP servers. @param mcpServers the servers map */
-    public void setMcpServers(Map<String, Object> mcpServers) {
+    public void setMcpServers(Map<String, McpServerConfig> mcpServers) {
         this.mcpServers = mcpServers;
     }
 
@@ -319,6 +328,29 @@ public void setConfigDir(String configDir) {
         this.configDir = configDir;
     }
 
+    /** Gets enable config discovery flag. @return the flag */
+    public Boolean getEnableConfigDiscovery() {
+        return enableConfigDiscovery;
+    }
+
+    /** Sets enable config discovery flag. @param enableConfigDiscovery the flag */
+    public void setEnableConfigDiscovery(Boolean enableConfigDiscovery) {
+        this.enableConfigDiscovery = enableConfigDiscovery;
+    }
+
+    /** Gets include sub-agent streaming events flag. @return the flag */
+    public Boolean getIncludeSubAgentStreamingEvents() {
+        return includeSubAgentStreamingEvents;
+    }
+
+    /**
+     * Sets include sub-agent streaming events flag. @param
+     * includeSubAgentStreamingEvents the flag
+     */
+    public void setIncludeSubAgentStreamingEvents(Boolean includeSubAgentStreamingEvents) {
+        this.includeSubAgentStreamingEvents = includeSubAgentStreamingEvents;
+    }
+
     /** Gets the commands wire definitions. @return the commands */
     public List<CommandWireDefinition> getCommands() {
         return commands == null ? null : Collections.unmodifiableList(commands);
@@ -338,4 +370,16 @@ public Boolean getRequestElicitation() {
     public void setRequestElicitation(Boolean requestElicitation) {
         this.requestElicitation = requestElicitation;
     }
+
+    /** Gets the model capabilities override. @return the override */
+    public ModelCapabilitiesOverride getModelCapabilities() {
+        return modelCapabilities;
+    }
+
+    /**
+     * Sets the model capabilities override. @param modelCapabilities the override
+     */
+    public void setModelCapabilities(ModelCapabilitiesOverride modelCapabilities) {
+        this.modelCapabilities = modelCapabilities;
+    }
 }
diff --git a/src/main/java/com/github/copilot/sdk/json/CustomAgentConfig.java b/src/main/java/com/github/copilot/sdk/json/CustomAgentConfig.java
@@ -50,11 +50,14 @@ public class CustomAgentConfig {
     private String prompt;
 
     @JsonProperty("mcpServers")
-    private Map<String, Object> mcpServers;
+    private Map<String, McpServerConfig> mcpServers;
 
     @JsonProperty("infer")
     private Boolean infer;
 
+    @JsonProperty("skills")
+    private List<String> skills;
+
     /**
      * Gets the unique identifier name for this agent.
      *
@@ -175,7 +178,7 @@ public CustomAgentConfig setPrompt(String prompt) {
      *
      * @return the MCP servers map
      */
-    public Map<String, Object> getMcpServers() {
+    public Map<String, McpServerConfig> getMcpServers() {
         return mcpServers == null ? null : Collections.unmodifiableMap(mcpServers);
     }
 
@@ -186,7 +189,7 @@ public Map<String, Object> getMcpServers() {
      *            the MCP server configurations
      * @return this config for method chaining
      */
-    public CustomAgentConfig setMcpServers(Map<String, Object> mcpServers) {
+    public CustomAgentConfig setMcpServers(Map<String, McpServerConfig> mcpServers) {
         this.mcpServers = mcpServers;
         return this;
     }
@@ -211,4 +214,31 @@ public CustomAgentConfig setInfer(Boolean infer) {
         this.infer = infer;
         return this;
     }
+
+    /**
+     * Gets the list of skill names to preload into this agent's context.
+     *
+     * @return the list of skill names, or {@code null} if not set
+     */
+    public List<String> getSkills() {
+        return skills == null ? null : Collections.unmodifiableList(skills);
+    }
+
+    /**
+     * Sets the list of skill names to preload into this agent's context.
+     * <p>
+     * When set, the full content of each listed skill is eagerly injected into the
+     * agent's context at startup. Skills are resolved by name from the session's
+     * configured skill directories
+     * ({@link SessionConfig#setSkillDirectories(List)}). When omitted, no skills
+     * are injected (opt-in model).
+     *
+     * @param skills
+     *            the list of skill names to preload
+     * @return this config for method chaining
+     */
+    public CustomAgentConfig setSkills(List<String> skills) {
+        this.skills = skills;
+        return this;
+    }
 }
diff --git a/src/main/java/com/github/copilot/sdk/json/McpHttpServerConfig.java b/src/main/java/com/github/copilot/sdk/json/McpHttpServerConfig.java
@@ -0,0 +1,106 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *--------------------------------------------------------------------------------------------*/
+
+package com.github.copilot.sdk.json;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * Configuration for a remote HTTP/SSE MCP (Model Context Protocol) server.
+ * <p>
+ * Use this to configure an MCP server that communicates over HTTP or
+ * Server-Sent Events (SSE).
+ *
+ * <h2>Example Usage</h2>
+ *
+ * <pre>{@code
+ * var server = new McpHttpServerConfig().setUrl("https://mcp.example.com/sse").setTools(List.of("*"));
+ *
+ * var config = new SessionConfig().setMcpServers(Map.of("remote-server", server));
+ * }</pre>
+ *
+ * @see McpServerConfig
+ * @see SessionConfig#setMcpServers(java.util.Map)
+ * @since 1.3.0
+ */
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public final class McpHttpServerConfig extends McpServerConfig {
+
+    @JsonProperty("type")
+    private final String type = "http";
+
+    @JsonProperty("url")
+    private String url;
+
+    @JsonProperty("headers")
+    private Map<String, String> headers;
+
+    /**
+     * Gets the server type discriminator.
+     *
+     * @return always {@code "http"}
+     */
+    public String getType() {
+        return type;
+    }
+
+    /**
+     * Gets the URL of the remote server.
+     *
+     * @return the server URL
+     */
+    public String getUrl() {
+        return url;
+    }
+
+    /**
+     * Sets the URL of the remote server.
+     *
+     * @param url
+     *            the server URL
+     * @return this config for method chaining
+     */
+    public McpHttpServerConfig setUrl(String url) {
+        this.url = url;
+        return this;
+    }
+
+    /**
+     * Gets the optional HTTP headers to include in requests.
+     *
+     * @return the headers map, or {@code null}
+     */
+    public Map<String, String> getHeaders() {
+        return headers == null ? null : Collections.unmodifiableMap(headers);
+    }
+
+    /**
+     * Sets optional HTTP headers to include in requests to this server.
+     *
+     * @param headers
+     *            the headers map
+     * @return this config for method chaining
+     */
+    public McpHttpServerConfig setHeaders(Map<String, String> headers) {
+        this.headers = headers;
+        return this;
+    }
+
+    @Override
+    public McpHttpServerConfig setTools(List<String> tools) {
+        super.setTools(tools);
+        return this;
+    }
+
+    @Override
+    public McpHttpServerConfig setTimeout(Integer timeout) {
+        super.setTimeout(timeout);
+        return this;
+    }
+}
Original file line number	Diff line number	Diff line change
		@@ -1 +1 @@
		c3fa6cbfb83d4a20b7912b1a17013d48f5a277a1
		922959f4a7b83509c3620d4881733c6c5677f00c