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Author	SHA1	Message	Date
Kyle CarberryandCoder Agent	385146000b	feat: record created_at/completed_at on reasoning ChatMessageParts (#24789 ) Records reasoning start and end times on persisted reasoning `ChatMessagePart`s so reasoning duration can be computed for stored chats. Backend-only: no SSE changes and no frontend rendering ship in this PR. The `created_at` field on `ChatMessagePart` is extended to also be present on `reasoning` parts (it previously appeared only on `tool-call` and `tool-result`), and a new `completed_at` field is added for `reasoning` parts. ### How timestamps are recorded - `StreamPartTypeReasoningStart`: stamp `startedAt = dbtime.Now()` on the active reasoning state. - `StreamPartTypeReasoningEnd`: stamp `completedAt = dbtime.Now()` and append both into parallel `[]time.Time` slices on `stepResult`. - Persistence reads the slices in occurrence order (reasoning has no provider-side ID) and applies them to the matching `ChatMessagePart` via `buildAssistantPartsForPersist`. The first reasoning block's stamps go onto the first reasoning part, and so on. - `flushActiveState` flushes partial reasoning interrupted before `StreamPartTypeReasoningEnd` with `startedAt` from the active state and `completedAt = dbtime.Now()` at the interruption. ### Why two fields, not one? Tool calls and results are point events. The frontend computes their duration by subtracting the call's `created_at` from the result's `created_at`. Reasoning is one assistant part that brackets a span, so we record both endpoints on the part itself. ### Why not stamp in `PartFromContent`? Same rationale as #24101: `PartFromContent` is called during both SSE publishing and persistence. Stamping there would yield incorrect persistence-time timestamps for reasoning blocks that finished much earlier in the step. Instead we capture in the chatloop and apply during persistence. <details><summary>Implementation plan</summary> - `codersdk/chats.go`: extend `CreatedAt`'s `variants` to include `reasoning?`; add `CompletedAt *time.Time` with `variants:"reasoning?"`. - `coderd/x/chatd/chatloop/chatloop.go`: extend `reasoningState` with `startedAt`; extend `stepResult` and `PersistedStep` with parallel `[]time.Time` reasoning slices; stamp on `ReasoningStart`/`ReasoningEnd`; thread the slices through all `PersistStep` call sites including the interrupt-safe path; record partial reasoning in `flushActiveState`. - `coderd/x/chatd/attachments.go`: walk reasoning parts in occurrence order and apply `step.ReasoningStartedAt[i]` to `part.CreatedAt` and `step.ReasoningCompletedAt[i]` to `part.CompletedAt`. ### Tests - `codersdk/chats_test.go` round-trips `created_at` + `completed_at` on reasoning parts and verifies omission when absent and partial interrupted parts. - `coderd/x/chatd/chatprompt/chatprompt_test.go` asserts `PartFromContent(ReasoningContent{})` does NOT stamp timestamps. - `coderd/x/chatd/chatloop/chatloop_test.go` `TestRun_ReasoningTimestamps` drives a stream with two reasoning blocks and verifies parallel slices, monotonicity, ordering, non-zero values, and content-block ordering. `TestRun_InterruptedReasoningFlushesTimestamps` cancels mid-reasoning and verifies `flushActiveState` records a non-zero pair. - `coderd/x/chatd/attachments_test.go` covers `buildAssistantPartsForPersist` for normal interleaved reasoning, partial (zero `completed_at`), and missing slices. </details> > Generated by Coder Agents. Co-authored-by: Coder Agent <agent@coder.com>	2026-05-18 12:30:30 -04:00
Ethan	cc4e04afde	feat(site): display file attachments in chat UI (#24281 ) Renders the durable file attachments introduced in #24280 in the chat interface. Without this, attachments were stored and served correctly but the UI showed raw file parts with no previews or download UX. Every attachment gets a download affordance, split into three rendering tiers: - Images — thumbnail with a hover/focus overlay containing a download link. `onFocusCapture`/`onBlurCapture` with `contains(relatedTarget)` keeps the overlay open while tabbing between the image and its download link. - Text-like files (`text/`, `application/json`) — expandable preview button with loading + error-with-retry states and the same download overlay. Preview fetches throw a typed `FetchTextAttachmentError` with a `.status` field instead of a stringly-typed error. - Everything else* — compact `FileCard` with extension badge, filename, and download link. User-side and assistant-side rendering now share `AttachmentBlocks.tsx` (`AttachmentPreviewFrame`, `TextAttachmentButton`, `ImageAttachmentButton`, `FileCard`, plus `getAttachmentHref`/`getAttachmentName`) instead of two near-duplicate implementations. The text-attachment overlay anchors to the preview surface so the download button stays pinned even when a loading/error status line widens the row below. `ComputerRenderer` detects when a screenshot was stored as a durable attachment (`attachment_file_id`) and suppresses the stale base64 rendering — the screenshot appears as a proper file part instead. `ToolLabel` shows the attached filename for `attach_file` tool calls. Storybook coverage in `ConversationTimeline.stories.tsx` was expanded to cover every tier (single/multiple images, inline + file-id text, JSON, download-only files, fetch-failure retry, mixed attachments + file references) with play-function assertions. <img width="811" height="150" alt="image" src="https://github.com/user-attachments/assets/27c71081-3502-4e80-92a7-d8adf1ff9323" /> ## Cleanup Per Mathias' post-merge suggestion on #24280, this PR also relocates `coderd/chatfiles` → `coderd/x/chatfiles` so the durable-attachment helpers live beside the rest of the `chatd` experimental surface. Closes CODAGT-91	2026-04-22 20:11:53 +10:00
Ethan	ef6969dd70	feat(coderd/x/chatd): agent-created file attachments in chat (#24280 ) Agents can already see workspace files and take screenshots, but users could not download those artifacts from chat. This PR adds durable chat attachments to chatd. `attach_file`, explicit `computer` screenshot actions (not the automatic post-action screenshots), and `propose_plan` now fetch bytes over the agent connection, store them in `chat_files`, link them to the chat, and carry attachment metadata in tool responses so `buildAssistantPartsForPersist` can materialize ordinary `type:"file"` assistant parts that the chat file APIs serve. The same storage helpers are reused for other artifact-producing paths. `wait_agent` recordings and thumbnails are stored as chat files and linked back to the parent chat, with best-effort relinking so parent chats retain those artifacts without leaving orphaned rows when chat-file caps reject links. `storeChatAttachment` wraps insert + link in one transaction, files are capped at 10 MB each and 20 per chat, and serving defaults to `Content-Disposition: attachment` with an explicit inline-safe allowlist. This PR also consolidates chat-file media policy in `coderd/chatfiles`. Uploads and tool-generated attachments share byte-based MIME detection, SVG blocking, inline-safety rules, and compatible `text/plain` refinement for JSON, CSV, and Markdown. Prompt construction still only inlines synthetic pasted text for model consumption; assistant-created attachments are persisted for the user and intentionally not replayed into later LLM turns. UI follow-up lives in #24281. Relates to CODAGT-91	2026-04-20 18:04:35 +10:00

Author

SHA1

Message

Date

Kyle CarberryandCoder Agent

385146000b

feat: record created_at/completed_at on reasoning ChatMessageParts (#24789 )

Records reasoning start and end times on persisted reasoning
`ChatMessagePart`s so reasoning duration can be computed for stored
chats. Backend-only: no SSE changes and no frontend rendering ship in
this PR.

The `created_at` field on `ChatMessagePart` is extended to also be
present on `reasoning` parts (it previously appeared only on `tool-call`
and `tool-result`), and a new `completed_at` field is added for
`reasoning` parts.

### How timestamps are recorded

- `StreamPartTypeReasoningStart`: stamp `startedAt = dbtime.Now()` on
the active reasoning state.
- `StreamPartTypeReasoningEnd`: stamp `completedAt = dbtime.Now()` and
append both into parallel `[]time.Time` slices on `stepResult`.
- Persistence reads the slices in occurrence order (reasoning has no
provider-side ID) and applies them to the matching `ChatMessagePart` via
`buildAssistantPartsForPersist`. The first reasoning block's stamps go
onto the first reasoning part, and so on.
- `flushActiveState` flushes partial reasoning interrupted before
`StreamPartTypeReasoningEnd` with `startedAt` from the active state and
`completedAt = dbtime.Now()` at the interruption.

### Why two fields, not one?

Tool calls and results are point events. The frontend computes their
duration by subtracting the call's `created_at` from the result's
`created_at`. Reasoning is one assistant part that brackets a span, so
we record both endpoints on the part itself.

### Why not stamp in `PartFromContent`?

Same rationale as #24101: `PartFromContent` is called during both SSE
publishing and persistence. Stamping there would yield incorrect
persistence-time timestamps for reasoning blocks that finished much
earlier in the step. Instead we capture in the chatloop and apply during
persistence.

<details><summary>Implementation plan</summary>

- `codersdk/chats.go`: extend `CreatedAt`'s `variants` to include
`reasoning?`; add `CompletedAt *time.Time` with `variants:"reasoning?"`.
- `coderd/x/chatd/chatloop/chatloop.go`: extend `reasoningState` with
`startedAt`; extend `stepResult` and `PersistedStep` with parallel
`[]time.Time` reasoning slices; stamp on
`ReasoningStart`/`ReasoningEnd`; thread the slices through all
`PersistStep` call sites including the interrupt-safe path; record
partial reasoning in `flushActiveState`.
- `coderd/x/chatd/attachments.go`: walk reasoning parts in occurrence
order and apply `step.ReasoningStartedAt[i]` to `part.CreatedAt` and
`step.ReasoningCompletedAt[i]` to `part.CompletedAt`.

### Tests

- `codersdk/chats_test.go` round-trips `created_at` + `completed_at` on
reasoning parts and verifies omission when absent and partial
interrupted parts.
- `coderd/x/chatd/chatprompt/chatprompt_test.go` asserts
`PartFromContent(ReasoningContent{})` does NOT stamp timestamps.
- `coderd/x/chatd/chatloop/chatloop_test.go`
`TestRun_ReasoningTimestamps` drives a stream with two reasoning blocks
and verifies parallel slices, monotonicity, ordering, non-zero values,
and content-block ordering.
`TestRun_InterruptedReasoningFlushesTimestamps` cancels mid-reasoning
and verifies `flushActiveState` records a non-zero pair.
- `coderd/x/chatd/attachments_test.go` covers
`buildAssistantPartsForPersist` for normal interleaved reasoning,
partial (zero `completed_at`), and missing slices.

</details>

> Generated by Coder Agents.

Co-authored-by: Coder Agent <agent@coder.com>

2026-05-18 12:30:30 -04:00

Ethan

cc4e04afde

feat(site): display file attachments in chat UI (#24281 )

Renders the durable file attachments introduced in #24280 in the chat
interface. Without this, attachments were stored and served correctly
but the UI showed raw file parts with no previews or download UX.

Every attachment gets a download affordance, split into three rendering
tiers:

- **Images** — thumbnail with a hover/focus overlay containing a
download link. `onFocusCapture`/`onBlurCapture` with
`contains(relatedTarget)` keeps the overlay open while tabbing between
the image and its download link.
- **Text-like files** (`text/*`, `application/json`) — expandable
preview button with loading + error-with-retry states and the same
download overlay. Preview fetches throw a typed
`FetchTextAttachmentError` with a `.status` field instead of a
stringly-typed error.
- **Everything else** — compact `FileCard` with extension badge,
filename, and download link.

User-side and assistant-side rendering now share `AttachmentBlocks.tsx`
(`AttachmentPreviewFrame`, `TextAttachmentButton`,
`ImageAttachmentButton`, `FileCard`, plus
`getAttachmentHref`/`getAttachmentName`) instead of two near-duplicate
implementations. The text-attachment overlay anchors to the preview
surface so the download button stays pinned even when a loading/error
status line widens the row below.

`ComputerRenderer` detects when a screenshot was stored as a durable
attachment (`attachment_file_id`) and suppresses the stale base64
rendering — the screenshot appears as a proper file part instead.
`ToolLabel` shows the attached filename for `attach_file` tool calls.

Storybook coverage in `ConversationTimeline.stories.tsx` was expanded to
cover every tier (single/multiple images, inline + file-id text, JSON,
download-only files, fetch-failure retry, mixed attachments + file
references) with play-function assertions.

<img width="811" height="150" alt="image"
src="https://github.com/user-attachments/assets/27c71081-3502-4e80-92a7-d8adf1ff9323"
/>



## Cleanup

Per Mathias' post-merge suggestion on #24280, this PR also relocates
`coderd/chatfiles` → `coderd/x/chatfiles` so the durable-attachment
helpers live beside the rest of the `chatd` experimental surface.

Closes CODAGT-91

2026-04-22 20:11:53 +10:00

Ethan

ef6969dd70

feat(coderd/x/chatd): agent-created file attachments in chat (#24280 )

Agents can already see workspace files and take screenshots, but users could not download those artifacts from chat. This PR adds durable chat attachments to chatd. `attach_file`, explicit `computer` screenshot actions (not the automatic post-action screenshots), and `propose_plan` now fetch bytes over the agent connection, store them in `chat_files`, link them to the chat, and carry attachment metadata in tool responses so `buildAssistantPartsForPersist` can materialize ordinary `type:"file"` assistant parts that the chat file APIs serve.

The same storage helpers are reused for other artifact-producing paths. `wait_agent` recordings and thumbnails are stored as chat files and linked back to the parent chat, with best-effort relinking so parent chats retain those artifacts without leaving orphaned rows when chat-file caps reject links. `storeChatAttachment` wraps insert + link in one transaction, files are capped at 10 MB each and 20 per chat, and serving defaults to `Content-Disposition: attachment` with an explicit inline-safe allowlist.

This PR also consolidates chat-file media policy in `coderd/chatfiles`. Uploads and tool-generated attachments share byte-based MIME detection, SVG blocking, inline-safety rules, and compatible `text/plain` refinement for JSON, CSV, and Markdown. Prompt construction still only inlines synthetic pasted text for model consumption; assistant-created attachments are persisted for the user and intentionally not replayed into later LLM turns.

UI follow-up lives in #24281.

Relates to CODAGT-91

2026-04-20 18:04:35 +10:00