diff --git a/sdk/typescript/src/types.ts b/sdk/typescript/src/types.ts
index f3000c71..7402dfb7 100644
--- a/sdk/typescript/src/types.ts
+++ b/sdk/typescript/src/types.ts
@@ -96,7 +96,7 @@ export interface AttachmentInfo {
   filename: string;
   mime_type: string;
   size_bytes: number;
-  /** "image" or "text". */
+  /** "image", "text", "pdf", or "audio". */
   kind: string;
 }
 
diff --git a/turnstone/api/server_schemas.py b/turnstone/api/server_schemas.py
index bf50127f..c99b5668 100644
--- a/turnstone/api/server_schemas.py
+++ b/turnstone/api/server_schemas.py
@@ -74,7 +74,10 @@ class AttachmentInfo(BaseModel):
     filename: str = Field(description="Original upload filename")
     mime_type: str = Field(description="Canonicalized MIME type")
     size_bytes: int = Field(description="Payload size in bytes")
-    kind: str = Field(description="'image' or 'text'", examples=["image", "text"])
+    kind: str = Field(
+        description="'image', 'text', 'pdf', or 'audio'",
+        examples=["image", "text", "pdf", "audio"],
+    )
 
 
 class UploadAttachmentResponse(AttachmentInfo):
diff --git a/turnstone/console/static/admin.js b/turnstone/console/static/admin.js
index e2bf29fc..f3a4e4aa 100644
--- a/turnstone/console/static/admin.js
+++ b/turnstone/console/static/admin.js
@@ -5097,22 +5097,26 @@ const _MODEL_CAP_KEYS = [
   "supports_tools",
   "supports_streaming",
   "supports_vision",
+  "supports_pdf",
   "supports_web_search",
   "supports_temperature",
   "supports_effort",
   "supports_transcription",
   "supports_speech_synthesis",
+  "supports_audio_input",
   "supports_rerank",
 ];
 const _MODEL_CAP_DEFAULTS = {
   supports_tools: true,
   supports_streaming: true,
   supports_vision: false,
+  supports_pdf: false,
   supports_web_search: false,
   supports_temperature: true,
   supports_effort: false,
   supports_transcription: false,
   supports_speech_synthesis: false,
+  supports_audio_input: false,
   supports_rerank: false,
 };
 let _modelCapsBaseline = {}; // known-model table values (display + delta base)
diff --git a/turnstone/console/static/index.html b/turnstone/console/static/index.html
index 3f42833d..2c30fe33 100644
--- a/turnstone/console/static/index.html
+++ b/turnstone/console/static/index.html
@@ -1769,6 +1769,12 @@
                   ></span
                   ><span class="cap-name">Vision</span></label
                 >
+                <label class="cap"
+                  ><input type="checkbox" data-cap="supports_pdf" /><span
+                    class="cap-led"
+                  ></span
+                  ><span class="cap-name">PDF documents</span></label
+                >
                 <label class="cap"
                   ><input type="checkbox" data-cap="supports_web_search" /><span
                     class="cap-led"
@@ -1802,6 +1808,12 @@
                   /><span class="cap-led"></span
                   ><span class="cap-name">Speech (TTS)</span></label
                 >
+                <label class="cap"
+                  ><input type="checkbox" data-cap="supports_audio_input" /><span
+                    class="cap-led"
+                  ></span
+                  ><span class="cap-name">Audio input</span></label
+                >
                 <label class="cap"
                   ><input type="checkbox" data-cap="supports_rerank" /><span
                     class="cap-led"
diff --git a/turnstone/sdk/_types.py b/turnstone/sdk/_types.py
index 2365adbc..9de21903 100644
--- a/turnstone/sdk/_types.py
+++ b/turnstone/sdk/_types.py
@@ -11,8 +11,8 @@ class AttachmentUpload:
 
     Used by ``upload_attachment`` and by ``create_workstream(attachments=...)``.
     ``mime_type`` is advisory — the server applies its own magic-byte
-    sniffing for images and UTF-8 validation for text documents and
-    rejects anything that doesn't match its allowlist.
+    sniffing (images, PDF, audio) and UTF-8 validation for text documents,
+    and rejects anything that doesn't match its allowlist.
     """
 
     filename: str
diff --git a/turnstone/shared_static/composer.js b/turnstone/shared_static/composer.js
index ff86d7bb..44da6439 100644
--- a/turnstone/shared_static/composer.js
+++ b/turnstone/shared_static/composer.js
@@ -35,9 +35,11 @@
  * anywhere onto the pane to attach.
  */
 var ATTACH_DEFAULT_ACCEPT =
-  "image/png,image/jpeg,image/gif,image/webp,text/*," +
+  "image/png,image/jpeg,image/gif,image/webp,application/pdf,text/*," +
+  "audio/wav,audio/mpeg,audio/ogg,audio/flac,audio/mp4,audio/aac,audio/webm," +
   ".md,.py,.js,.ts,.tsx,.jsx,.json,.yaml,.yml,.toml,.html,.css,.sh," +
-  ".rs,.go,.java,.c,.cpp,.h,.hpp,.sql,.xml,.ini,.conf";
+  ".rs,.go,.java,.c,.cpp,.h,.hpp,.sql,.xml,.ini,.conf," +
+  ".pdf,.mp3,.wav,.ogg,.flac,.m4a,.aac,.webm";
 
 var AUTO_RESIZE_MAX_PX = 200;
 
@@ -525,9 +527,7 @@ Composer.prototype._wireEvents = function () {
       });
       this._on(target, "drop", function (e) {
         target.classList.remove(dropClass);
-        var files = Array.from(
-          (e.dataTransfer && e.dataTransfer.files) || [],
-        );
+        var files = Array.from((e.dataTransfer && e.dataTransfer.files) || []);
         if (files.length > 0) {
           e.preventDefault();
           files.forEach(function (f) {
@@ -613,9 +613,7 @@ Composer.prototype.setBusy = function (b) {
   // Placeholder swap applies whenever busy, not only in queue mode —
   // callers that don't set busyPlaceholder see no visible change
   // because it defaults to idlePlaceholder.
-  this.inputEl.placeholder = b
-    ? this._busyPlaceholder
-    : this._idlePlaceholder;
+  this.inputEl.placeholder = b ? this._busyPlaceholder : this._idlePlaceholder;
 
   // Disabled state — composer owns it unless caller opted out.
   if (!opts.externalDisable) {
@@ -806,7 +804,6 @@ Composer.prototype.destroy = function () {
   this.el = null;
 };
 
-
 // --- Legacy window bridge ---------------------------------------------------
 // Still-classic consumers reach this as a global at event/boot time (after
 // this deferred module evaluated).  New module code imports instead.
diff --git a/turnstone/shared_static/composer_attachments.js b/turnstone/shared_static/composer_attachments.js
index c0f8dde1..eaa4bd3a 100644
--- a/turnstone/shared_static/composer_attachments.js
+++ b/turnstone/shared_static/composer_attachments.js
@@ -36,6 +36,17 @@ function formatSize(n) {
   return (n / (1024 * 1024)).toFixed(1) + " MB";
 }
 
+function _inferKind(file) {
+  // Optimistic placeholder-chip guess only; the server's classify_upload is
+  // authoritative and the real kind arrives on the upload response.
+  var t = (file.type || "").toLowerCase();
+  var n = (file.name || "").toLowerCase();
+  if (t.indexOf("image/") === 0) return "image";
+  if (t === "application/pdf" || n.endsWith(".pdf")) return "pdf";
+  if (t.indexOf("audio/") === 0) return "audio";
+  return "text";
+}
+
 function _toastError(msg) {
   if (typeof window.toast !== "undefined" && window.toast.error) {
     window.toast.error(msg);
@@ -172,7 +183,7 @@ export function createAttachmentController(opts) {
       filename: file.name,
       size_bytes: file.size,
       mime_type: file.type || "",
-      kind: (file.type || "").indexOf("image/") === 0 ? "image" : "text",
+      kind: _inferKind(file),
       uploading: true,
     };
     pending.set(placeholderId, placeholder);
@@ -300,7 +311,6 @@ export function createAttachmentController(opts) {
   };
 }
 
-
 // --- Legacy window bridge ---------------------------------------------------
 // Still-classic consumers reach this as a global at event/boot time (after
 // this deferred module evaluated).  New module code imports instead.