feat: add endpoints to delete and update message parts

packages/opencode/src/server/server.ts

@@ -1177,6 +1177,79 @@ export namespace Server {
           return c.json(message)
         },
       )
+      .delete(
+        "/session/:sessionID/message/:messageID/part/:partID",
+        describeRoute({
+          description: "Delete a part from a message",
+          operationId: "part.delete",
+          responses: {
+            200: {
+              description: "Successfully deleted part",
+              content: {
+                "application/json": {
+                  schema: resolver(z.boolean()),
+                },
+              },
+            },
+            ...errors(400, 404),
+          },
+        }),
+        validator(
+          "param",
+          z.object({
+            sessionID: z.string().meta({ description: "Session ID" }),
+            messageID: z.string().meta({ description: "Message ID" }),
+            partID: z.string().meta({ description: "Part ID" }),
+          }),
+        ),
+        async (c) => {
+          const params = c.req.valid("param")
+          await Session.removePart({
+            sessionID: params.sessionID,
+            messageID: params.messageID,
+            partID: params.partID,
+          })
+          return c.json(true)
+        },
+      )
+      .patch(
+        "/session/:sessionID/message/:messageID/part/:partID",
+        describeRoute({
+          description: "Update a part in a message",
+          operationId: "part.update",
+          responses: {
+            200: {
+              description: "Successfully updated part",
+              content: {
+                "application/json": {
+                  schema: resolver(MessageV2.Part),
+                },
+              },
+            },
+            ...errors(400, 404),
+          },
+        }),
+        validator(
+          "param",
+          z.object({
+            sessionID: z.string().meta({ description: "Session ID" }),
+            messageID: z.string().meta({ description: "Message ID" }),
+            partID: z.string().meta({ description: "Part ID" }),
+          }),
+        ),
+        validator("json", MessageV2.Part),
+        async (c) => {
+          const params = c.req.valid("param")
+          const body = c.req.valid("json")
+          if (body.id !== params.partID || body.messageID !== params.messageID || body.sessionID !== params.sessionID) {
+            throw new Error(
+              `Part mismatch: body.id='${body.id}' vs partID='${params.partID}', body.messageID='${body.messageID}' vs messageID='${params.messageID}', body.sessionID='${body.sessionID}' vs sessionID='${params.sessionID}'`,
+            )
+          }
+          const part = await Session.updatePart(body)
+          return c.json(part)
+        },
+      )
       .post(
         "/session/:sessionID/message",
         describeRoute({

packages/opencode/src/session/index.ts

@@ -339,6 +339,23 @@ export namespace Session {
     },
   )
 
+  export const removePart = fn(
+    z.object({
+      sessionID: Identifier.schema("session"),
+      messageID: Identifier.schema("message"),
+      partID: Identifier.schema("part"),
+    }),
+    async (input) => {
+      await Storage.remove(["part", input.messageID, input.partID])
+      Bus.publish(MessageV2.Event.PartRemoved, {
+        sessionID: input.sessionID,
+        messageID: input.messageID,
+        partID: input.partID,
+      })
+      return input.partID
+    },
+  )
+
   const UpdatePartInput = z.union([
     MessageV2.Part,
     z.object({

packages/sdk/js/src/v2/gen/sdk.gen.ts

@@ -47,6 +47,11 @@ import type {
   McpLocalConfig,
   McpRemoteConfig,
   McpStatusResponses,
+  Part as Part2,
+  PartDeleteErrors,
+  PartDeleteResponses,
+  PartUpdateErrors,
+  PartUpdateResponses,
   PathGetResponses,
   PermissionRespondErrors,
   PermissionRespondResponses,
@@ -1486,6 +1491,79 @@ export class Session extends HeyApiClient {
   }
 }
 
+export class Part extends HeyApiClient {
+  /**
+   * Delete a part from a message
+   */
+  public delete<ThrowOnError extends boolean = false>(
+    parameters: {
+      sessionID: string
+      messageID: string
+      partID: string
+      directory?: string
+    },
+    options?: Options<never, ThrowOnError>,
+  ) {
+    const params = buildClientParams(
+      [parameters],
+      [
+        {
+          args: [
+            { in: "path", key: "sessionID" },
+            { in: "path", key: "messageID" },
+            { in: "path", key: "partID" },
+            { in: "query", key: "directory" },
+          ],
+        },
+      ],
+    )
+    return (options?.client ?? this.client).delete<PartDeleteResponses, PartDeleteErrors, ThrowOnError>({
+      url: "/session/{sessionID}/message/{messageID}/part/{partID}",
+      ...options,
+      ...params,
+    })
+  }
+
+  /**
+   * Update a part in a message
+   */
+  public update<ThrowOnError extends boolean = false>(
+    parameters: {
+      sessionID: string
+      messageID: string
+      partID: string
+      directory?: string
+      part?: Part2
+    },
+    options?: Options<never, ThrowOnError>,
+  ) {
+    const params = buildClientParams(
+      [parameters],
+      [
+        {
+          args: [
+            { in: "path", key: "sessionID" },
+            { in: "path", key: "messageID" },
+            { in: "path", key: "partID" },
+            { in: "query", key: "directory" },
+            { key: "part", map: "body" },
+          ],
+        },
+      ],
+    )
+    return (options?.client ?? this.client).patch<PartUpdateResponses, PartUpdateErrors, ThrowOnError>({
+      url: "/session/{sessionID}/message/{messageID}/part/{partID}",
+      ...options,
+      ...params,
+      headers: {
+        "Content-Type": "application/json",
+        ...options?.headers,
+        ...params.headers,
+      },
+    })
+  }
+}
+
 export class Permission extends HeyApiClient {
   /**
    * Respond to permission
@@ -2588,6 +2666,8 @@ export class OpencodeClient extends HeyApiClient {
 
   session = new Session({ client: this.client })
 
+  part = new Part({ client: this.client })
+
   permission = new Permission({ client: this.client })
 
   command = new Command({ client: this.client })

packages/sdk/js/src/v2/gen/types.gen.ts

@@ -2901,6 +2901,94 @@ export type SessionMessageResponses = {
 
 export type SessionMessageResponse = SessionMessageResponses[keyof SessionMessageResponses]
 
+export type PartDeleteData = {
+  body?: never
+  path: {
+    /**
+     * Session ID
+     */
+    sessionID: string
+    /**
+     * Message ID
+     */
+    messageID: string
+    /**
+     * Part ID
+     */
+    partID: string
+  }
+  query?: {
+    directory?: string
+  }
+  url: "/session/{sessionID}/message/{messageID}/part/{partID}"
+}
+
+export type PartDeleteErrors = {
+  /**
+   * Bad request
+   */
+  400: BadRequestError
+  /**
+   * Not found
+   */
+  404: NotFoundError
+}
+
+export type PartDeleteError = PartDeleteErrors[keyof PartDeleteErrors]
+
+export type PartDeleteResponses = {
+  /**
+   * Successfully deleted part
+   */
+  200: boolean
+}
+
+export type PartDeleteResponse = PartDeleteResponses[keyof PartDeleteResponses]
+
+export type PartUpdateData = {
+  body?: Part
+  path: {
+    /**
+     * Session ID
+     */
+    sessionID: string
+    /**
+     * Message ID
+     */
+    messageID: string
+    /**
+     * Part ID
+     */
+    partID: string
+  }
+  query?: {
+    directory?: string
+  }
+  url: "/session/{sessionID}/message/{messageID}/part/{partID}"
+}
+
+export type PartUpdateErrors = {
+  /**
+   * Bad request
+   */
+  400: BadRequestError
+  /**
+   * Not found
+   */
+  404: NotFoundError
+}
+
+export type PartUpdateError = PartUpdateErrors[keyof PartUpdateErrors]
+
+export type PartUpdateResponses = {
+  /**
+   * Successfully updated part
+   */
+  200: Part
+}
+
+export type PartUpdateResponse = PartUpdateResponses[keyof PartUpdateResponses]
+
 export type SessionPromptAsyncData = {
   body?: {
     messageID?: string