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@@ -0,0 +1,57 @@
+# ChatReasoningComponent
+
+`ChatReasoningComponent` renders an assistant's reasoning content as a compact pill that expands to reveal the underlying text. The `<chat>` composition automatically renders this primitive above the assistant response when `Message.reasoning` is populated by the adapter — most consumers don't need to use it directly.
+
+**Selector:** `chat-reasoning`
+
+**Import:**
+
+```typescript
+import { ChatReasoningComponent, formatDuration } from '@ngaf/chat';
+```
+
+## Visual states
+
+| State | Pill label | Behavior |
+|---|---|---|
+| `[isStreaming]="true"` | "Thinking…" with pulsing dot | Auto-expanded; body streams in |
+| Idle, `[durationMs]` set | "Thought for Ns" | Collapsed by default; click to expand |
+| Idle, no `[durationMs]` | "Show reasoning" | Collapsed by default; click to expand |
+
+## Inputs
+
+| Input | Type | Default | Description |
+|---|---|---|---|
+| `[content]` | `string` | `''` | The reasoning text to render |
+| `[isStreaming]` | `boolean` | `false` | True while the model is mid-reasoning |
+| `[durationMs]` | `number \| undefined` | `undefined` | Wall-clock duration of the reasoning phase |
+| `[label]` | `string \| undefined` | `undefined` | Override the auto-derived label |
+| `[defaultExpanded]` | `boolean` | `false` | Open the panel by default when idle |
+
+## Standalone usage
+
+```html
+<chat-reasoning
+  [content]="reasoningText"
+  [isStreaming]="isStillThinking"
+  [durationMs]="thoughtFor"
+/>
+```
+
+## formatDuration utility
+
+Use `formatDuration(ms)` to render the duration string yourself (e.g. for a sidebar):
+
+```typescript
+formatDuration(0)      // "<1s"
+formatDuration(4_000)  // "4s"
+formatDuration(72_000) // "1m 12s"
+```
+
+## Behavior
+
+- The component hides itself entirely (`display: none`) when `[content]` is empty.
+- `[isStreaming]="true"` force-expands the panel so streaming content is visible.
+- A user click on the pill toggles the panel; the user choice persists across `[isStreaming]` transitions for the lifetime of the instance.
+- When `isStreaming` re-engages on a follow-up turn (a new reasoning phase begins after a prior idle period), the panel resets to expanded.
+- The body re-uses `<chat-streaming-md>` so reasoning content gets the same markdown rendering pipeline as the response (lists, code blocks, headings render).
@@ -1,139 +1,57 @@
 # ChatToolCallCardComponent
 
-`ChatToolCallCardComponent` is a composition that renders an expandable card for a single tool call. It displays the tool name in the header, shows a completion badge when done, and expands to reveal the tool's input arguments and output result.
+`ChatToolCallCardComponent` renders a single tool call as an expandable card with a status pill (running / complete / error), inputs, and output.
 
 **Selector:** `chat-tool-call-card`
 
 **Import:**
 
 ```typescript
-import { ChatToolCallCardComponent } from '@ngaf/chat';
-import type { ToolCallInfo } from '@ngaf/chat';
+import { ChatToolCallCardComponent, type ToolCallInfo } from '@ngaf/chat';
 ```
 
-## Basic Usage
+## Status pill
 
-```html
-<chat-tool-call-card [toolCall]="myToolCall" />
-```
+| Status | Visual | aria-label |
+|---|---|---|
+| `running` | spinner (animated) | "Running" |
+| `complete` | check (success color) | "Completed" |
+| `error` | exclamation (error color) | "Failed" |
 
-Where `myToolCall` is a `ToolCallInfo` object:
+## Default-collapsed behavior
 
-```typescript
-const myToolCall: ToolCallInfo = {
-  id: 'call_abc123',
-  name: 'search_documents',
-  args: { query: 'Angular signals tutorial' },
-  result: { documents: ['doc1', 'doc2'] },
-};
-```
+| Status | Default state |
+|---|---|
+| `running` | Expanded |
+| `error` | Expanded |
+| `complete` | Collapsed (when `[defaultCollapsed]="true"`, the default) |
 
-## API
+A user click on the header toggles open/closed. Once toggled, the user choice persists across status changes for the lifetime of the card.
 
-### Inputs
+## Inputs
 
 | Input | Type | Default | Description |
-|-------|------|---------|-------------|
-| `toolCall` | `ToolCallInfo` | **Required** | The tool call data to display |
+|---|---|---|---|
+| `[toolCall]` | `ToolCallInfo` | — (required) | `{id, name, args, status?, result?}` |
+| `[defaultCollapsed]` | `boolean` | `true` | Collapse on `complete`; pass `false` to keep cards always-expanded |
 
-## ToolCallInfo Type
+## ToolCallInfo
 
 ```typescript
 interface ToolCallInfo {
   id: string;
   name: string;
   args: unknown;
+  status?: 'pending' | 'running' | 'complete' | 'error';
   result?: unknown;
 }
 ```
 
-| Property | Type | Description |
-|----------|------|-------------|
-| `id` | `string` | Unique identifier for the tool call |
-| `name` | `string` | The tool function name (displayed in the header) |
-| `args` | `unknown` | The arguments passed to the tool (displayed as formatted JSON) |
-| `result` | `unknown \| undefined` | The tool's return value. When present, a green checkmark badge appears. |
-
-## Card Behavior
-
-### Collapsed State (Default)
-
-The card header shows:
-- A gear icon on the left
-- The tool name in monospace font
-- A green checkmark with "done" text when `result` is defined
-- A chevron toggle on the right
-
-### Expanded State
-
-Clicking the header toggles expansion. The expanded area shows:
-- **Inputs** section: The `args` value formatted as indented JSON
-- **Output** section (when `result` is defined): The `result` value formatted as indented JSON
-
-The component uses a `formatJson()` method that:
-- Returns strings directly
-- Serializes objects with `JSON.stringify(value, null, 2)`
-- Falls back to `String(value)` if serialization fails
-
-## Using with ChatToolCallsComponent
-
-The `ChatToolCallsComponent` primitive iterates over tool calls from a `LangGraphAgent`. Combine it with `ChatToolCallCardComponent` to render a list of tool call cards:
+## Basic usage
 
 ```html
-<chat-tool-calls [ref]="chatRef">
-  <ng-template let-toolCall>
-    <chat-tool-call-card [toolCall]="asToolCallInfo(toolCall)" />
-  </ng-template>
-</chat-tool-calls>
-```
+<chat-tool-call-card [toolCall]="tc" />
 
-```typescript
-import type { ToolCallWithResult } from '@langchain/langgraph-sdk';
-import type { ToolCallInfo } from '@ngaf/chat';
-
-asToolCallInfo(tc: ToolCallWithResult): ToolCallInfo {
-  return {
-    id: tc.id ?? '',
-    name: tc.name,
-    args: tc.args,
-    result: tc.result,
-  };
-}
-```
-
-## Using in Message Templates
-
-Display tool calls inline with AI messages:
-
-```html
-<chat-messages [ref]="chatRef">
-  <ng-template chatMessageTemplate="ai" let-message>
-    <div class="ai-message">{{ message.content }}</div>
-
-    <!-- Show tool calls attached to this AI message -->
-    <chat-tool-calls [ref]="chatRef" [message]="message">
-      <ng-template let-toolCall>
-        <chat-tool-call-card [toolCall]="asToolCallInfo(toolCall)" />
-      </ng-template>
-    </chat-tool-calls>
-  </ng-template>
-</chat-messages>
+<!-- Always-expanded -->
+<chat-tool-call-card [toolCall]="tc" [defaultCollapsed]="false" />
 ```
-
-## Styling
-
-The card uses the following CSS custom properties:
-
-| Variable | Applied To |
-|----------|-----------|
-| `--ngaf-chat-surface-alt` | Card background |
-| `--ngaf-chat-separator` | Card border, section dividers |
-| `--ngaf-chat-radius-card` | Card border radius |
-| `--ngaf-chat-text` | Tool name and JSON content |
-| `--ngaf-chat-text-muted` | Gear icon, chevron, section labels |
-| `--ngaf-chat-success` | Checkmark and "done" badge |
-
-## ARIA
-
-- The header button has `aria-expanded` reflecting the current state
-- The button has `aria-label="Toggle tool call details"`
@@ -0,0 +1,73 @@
+# ChatToolCallTemplateDirective
+
+`ChatToolCallTemplateDirective` registers a per-tool-name template inside `<chat-tool-calls>`. The primitive collects all directive instances and dispatches each tool call to the template matching its `name`. A literal `"*"` registers a wildcard catch-all for any unmapped name.
+
+**Selector:** `[chatToolCallTemplate]`
+
+**Import:**
+
+```typescript
+import { ChatToolCallTemplateDirective, type ChatToolCallTemplateContext } from '@ngaf/chat';
+```
+
+## Template context
+
+Each registered template receives:
+
+| Variable | Type | Description |
+|---|---|---|
+| `let-call` (`$implicit`) | `ToolCall` | The full tool call: `{id, name, args, status, result?, error?}` |
+| `let-status="status"` | `ToolCallStatus` | `'pending' \| 'running' \| 'complete' \| 'error'` |
+
+## Examples
+
+### Custom search-result card
+
+```html
+<chat-tool-calls [agent]="agent" [message]="msg">
+  <ng-template chatToolCallTemplate="search_web" let-call let-status="status">
+    <my-search-result-card
+      [query]="call.args.query"
+      [results]="call.result"
+      [status]="status"
+    />
+  </ng-template>
+</chat-tool-calls>
+```
+
+### Wildcard catch-all
+
+```html
+<chat-tool-calls [agent]="agent" [message]="msg">
+  <ng-template chatToolCallTemplate="search_web" let-call let-status="status">
+    <my-search-result-card [query]="call.args.query" [results]="call.result" />
+  </ng-template>
+
+  <!-- Anything not search_web falls through to here -->
+  <ng-template chatToolCallTemplate="*" let-call>
+    <chat-tool-call-card [toolCall]="call" />
+  </ng-template>
+</chat-tool-calls>
+```
+
+### Project through `<chat>` directly
+
+`<chat>` re-projects any `chatToolCallTemplate` directive inside it down to the inner `<chat-tool-calls>`:
+
+```html
+<chat [agent]="agent">
+  <ng-template chatToolCallTemplate="generate_image" let-call let-status="status">
+    <my-image-card
+      [prompt]="call.args.prompt"
+      [imageUrl]="call.result"
+      [status]="status"
+    />
+  </ng-template>
+</chat>
+```
+
+## Dispatch order
+
+1. Per-tool template whose `name` exactly matches `tc.name`.
+2. Wildcard template with `name === "*"`.
+3. Default `<chat-tool-call-card>` (no template registered for either).
@@ -0,0 +1,68 @@
+# ChatToolCallsComponent
+
+`ChatToolCallsComponent` renders all tool calls associated with an assistant message. By default sequential same-name calls auto-group into a labeled strip; consumers can register per-tool-name templates via the `chatToolCallTemplate` directive to fully replace the default card UX.
+
+**Selector:** `chat-tool-calls`
+
+**Import:**
+
+```typescript
+import { ChatToolCallsComponent } from '@ngaf/chat';
+```
+
+## Inputs
+
+| Input | Type | Default | Description |
+|---|---|---|---|
+| `[agent]` | `Agent` | — (required) | Source of `agent.toolCalls()` |
+| `[message]` | `Message \| undefined` | `undefined` | Filter to calls referenced by this message's `tool_use` content blocks |
+| `[grouping]` | `'auto' \| 'none'` | `'auto'` | Auto-collapse adjacent same-name calls into a strip |
+| `[groupSummary]` | `(name: string, count: number) => string` | built-in registry | Override the default strip label |
+
+## Default group summaries
+
+| Tool name shape | Default label |
+|---|---|
+| `search_*` | "Searched N sites" |
+| `generate_*` | "Generated N items" |
+| `read_*` | "Read N files" |
+| `write_*` | "Wrote N files" |
+| `list_*` | "Listed N items" |
+| Anything else | "Called {name} N times" |
+
+## Per-tool templates
+
+Register a template per tool name (or `"*"` as a wildcard) — see [chat-tool-call-template](./chat-tool-call-template).
+
+```html
+<chat-tool-calls [agent]="agent" [message]="msg">
+  <ng-template chatToolCallTemplate="search_web" let-call let-status="status">
+    <my-search-result-card [query]="call.args.query" [results]="call.result" />
+  </ng-template>
+</chat-tool-calls>
+```
+
+When a per-tool template is registered for a name, calls of that name skip grouping and are rendered each through the template (the consumer takes responsibility for visual density).
+
+## Custom group summary
+
+```html
+<chat-tool-calls
+  [agent]="agent"
+  [message]="msg"
+  [groupSummary]="myGroupSummary"
+/>
+```
+
+```typescript
+myGroupSummary = (name: string, count: number) =>
+  name === 'fetch_user' ? `Fetched ${count} profiles` : `${name} × ${count}`;
+```
+
+## Disabling grouping
+
+```html
+<chat-tool-calls [agent]="agent" [message]="msg" [grouping]="'none'" />
+```
+
+Each call renders independently regardless of name adjacency.
@@ -193,3 +193,27 @@ Under the hood, `ChatComponent` composes these primitives:
 - `ChatErrorComponent` for error display
 - `ChatInterruptComponent` for the interrupt banner
 - `ChatThreadListComponent` for the sidebar
+
+## Reasoning
+
+When a model emits reasoning content (gpt-5 / o-series with `reasoning` blocks, Anthropic with `thinking` blocks, or any AG-UI agent emitting `REASONING_MESSAGE_*` events), the adapter populates `Message.reasoning` and `Message.reasoningDurationMs`. The `<chat>` composition automatically renders [`<chat-reasoning>`](./chat-reasoning) above the assistant response. No configuration required.
+
+While reasoning is streaming, the pill shows "Thinking…" with a pulse dot and the body auto-expands so the user sees content arrive in real time. Once response text begins, the pill collapses to "Thought for Ns" (e.g. "Thought for 4s").
+
+## Tool-call templates
+
+Project a `<ng-template chatToolCallTemplate="…">` directly into `<chat>` to replace the default card UX for a specific tool name. The composition forwards the template into the inner [`<chat-tool-calls>`](./chat-tool-calls).
+
+```html
+<chat [agent]="agent">
+  <ng-template chatToolCallTemplate="generate_image" let-call let-status="status">
+    <my-image-card
+      [prompt]="call.args.prompt"
+      [imageUrl]="call.result"
+      [status]="status"
+    />
+  </ng-template>
+</chat>
+```
+
+A `chatToolCallTemplate="*"` wildcard catches any unmapped tool name. See [chatToolCallTemplate](./chat-tool-call-template) for the directive reference.