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When a reply was stopped or failed before the model sent any text, the chat kept an empty reply, and every later message in that chat sent it back to the model as part of the conversation. Providers that reject empty assistant messages then refused every new request, so the chat stayed unusable unless the empty reply was deleted from the database by hand. Empty replies are now skipped when the conversation is sent to the model, as replies that ended in an error already were. Chats already stuck like this work again on their next message, since nothing stored has to change.
Fixes#25083
Open WebUI puts the MCP server ID in front of every MCP tool name it offers to the model. When the two together are longer than 64 characters, providers that cap tool names at 64 (the OpenAI API, AWS Bedrock) reject the whole chat request, even if the model never picks that tool. Names over the limit are now cut to 64 characters ending in a short hash, so the same tool always gets the same name and the MCP server is still called with the original tool name. Names that already fit are unchanged.
Fixes#31821
In a chat inside a folder with knowledge attached, the chat only searches the folder's knowledge, but a sub-agent it started could list and search every knowledge base the user can read. Sub-agents now get the folder's knowledge like the chat that started them. They already receive the folder's system prompt as part of the chat's instructions, so it is not added a second time.
Fixes#31569
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Since 0.11.1, when a filter function wrote part of the reply before the model answered (for example some text and an HTML block), the artifact preview opened and then closed straight away. The page showed the filter text but was never sent it as part of the reply, so the model's first output overwrote it, the page briefly saw no HTML block and closed the preview. The filter text is now sent to the page before the model's output, so the preview stays open.
Fixes#31643
With tool approval set to ask, the request sent to the model after approving a tool call left out the system prompt. In a compacted chat it also left out the conversation summary and sent the whole history again. The request after approval now has the same system prompt and compacted context as the one before it, plus the tool call and its result. The system prompt is picked the same way as for any other message: the chat Controls prompt, else your personal Settings prompt, else the admin default. A system prompt sent only in an API request is not kept by the server, so it is still missing after approval.
Fixes#31499
With native function calling, citations produced by query_knowledge_files and query_chat_files never showed the relevance percentage badge, while the same knowledge base queried through classic RAG did.
The tools already return a distance per chunk, but the step that groups tool results into citation sources dropped it. Each grouped source now carries a distances list aligned with its documents, the same shape the classic RAG path emits, so the existing citation UI shows the badge without frontend changes. Chunks without a score (notes) leave the list empty, which the UI already treats as no score.
Fixes#29776
In "Ask for approval" mode, when the model requested several tools in one turn, only the first call got an approval card. The others stayed on "Executing..." forever, never ran, could not be approved (the server answered "already resolved"), and the model was called again without their results. The stuck state was saved to the chat.
Once streaming finishes, every call in the turn is marked as completed (arguments done, nothing run yet). The approval pause only queued siblings that were still in progress, so these were skipped. They are now queued as well, and each one gets its own approval card in turn after the previous one is resolved.
Calls that already have a result and rejected calls are untouched, and single-call turns behave as before. Verified against the real approval functions with same-name, mixed-name, reject and ask_user batches, plus the tests-repo unit suite (identical results before and after).
Fixes#29293
With a personal tool server connection such as Open Terminal, the main model could call its tools but a foreground sub-agent it delegated to got none of them. Chats resuming after a tool approval lost those tools the same way. Setting up the tools for the main model emptied the list those later steps read from. It now works on a copy, so sub-agents and resumed chats get the same tools as the parent.
Fixes#29893
When a model wraps its answer in <|begin_of_solution|> and <|end_of_solution|>, only the opening marker was removed. The closing marker stayed visible in the reply and was saved with the message, and anything the model wrote after it was glued onto the answer. Now both markers are removed and text after the answer shows up as a normal part of the reply.
Fixes#31434
Sometimes a reply where the model used tools gets saved with a tool result that no call in that reply asked for, or with a tool call that never got its result. The chat history was then sent to the provider unchanged, Anthropic and Bedrock rejected it, and every following message in that chat failed until the user deleted the broken reply. Now each tool call is only kept together with its own result from the same reply, and the unmatched calls and results are left out of what gets sent to the model. The chat itself is not changed, and correctly saved chats are sent exactly as before.
Fixes#28937
With reasoning models, when the first part of the answer arrived together with the end of the thinking block and ended with a space, that space went missing, so "The answer is 4." was shown and saved as "The answeris 4.". That space is now kept.
Fixes#31435
With a connection set to the Responses API, when the provider reported a reply as failed, the error showed while streaming but was gone after a reload, leaving an empty reply. Some other provider errors never showed up at all, not even while streaming. Both kinds of error now show up and are still there after a reload, the same as on Chat Completions connections.
Fixes#31433
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Fixes#31348
With title generation turned off (per user or by the admin), the chat is saved with the first user message as its title, but the live title event sent the assistant message instead. A new chat therefore kept showing "New Chat" in the header and tab until a reload, because the assistant message is still empty at that point. In a note's chat panel the whole model reply showed up as the title.
The fallback branch now sends the title it just saved, the same way the generated-title branch above it already does. The sidebar was never affected because it reloads titles from the database.
When an MCP tool returns an image or audio item, the file is uploaded to storage, but the whole MCP item, including its base64 payload, was also passed as upload metadata. That metadata is persisted in the file table's meta column, so every such result was stored twice: once in storage and once as base64 in the database, growing the DB and every file query that loads meta.
The MCP path now passes only chat_id, message_id and session_id, the same metadata the non-MCP tool image path already stores. Nothing reads the removed key.
Fixes#30411
Every new saved chat logged "Error generating initial chat title" with a
KeyError: 'model' traceback. The title itself was already generated and
saved by then, so the log was misleading, and the memory settings played no
part in it. The error was silently logged at debug level since v0.10.0 and
became visible in v0.11.4 when the title path switched to log.exception.
The initial title task runs the shared background handler with a context
that has no resolved model, which the memory review step read
unconditionally. It now reads it with a default of None, which the memory
review already accepts. The title path never carries an assistant message,
so the review stops before doing any work there, and the main completion
path keeps reviewing memory exactly once per turn with the real model.
Fixes#30339
When an MCP tool returns an image (e.g. a Home Assistant camera snapshot), the
snapshot shows up in the tool call section but the model never sees it: it
answers that there is no image. Only images arriving as inline data URIs were
attached to the model request; MCP images are uploaded to Files first and their
file URL was treated as display-only.
Now an image file item with a file URL is attached to the model request as an
input_image part in addition to staying in the tool call's displayed files. The
existing URL-to-base64 step already resolves file URLs, so the model receives
the image bytes; verified on a running instance with a mock MCP server and a
mock upstream (the second upstream request carries the byte-identical JPEG).
Inline data-URI images keep their existing model-only handling.
Fixes#30327
When a model calls display_file, write_file or replace_file_content with a relative path, Open Terminal resolves it against the session working directory and returns the absolute path, but the event sent to the browser carried the raw argument instead. The file panel matches that string against the file browser root, a relative path never matches, so the preview never opens, the panel jumps to the root and the session working directory is rewritten to the root. With the root turned off (OPEN_TERMINAL_FILE_BROWSER_ROOT=filesystem) there is nothing to clamp to and the relative string is sent to the terminal as the new working directory, moving it silently. The tool call itself succeeds either way, so the failure only shows up as a panel that will not open the file the model just wrote.
Both events now carry the path from the tool result and fall back to the argument when the result cannot be read, which is what build_terminal_file_tool_result already does for the chat file attachment. The same one-line rule is applied to the direct tool server path in the frontend, where the browser runs the tool itself and the write_file branch beside it was already correct.
Checked against a live Open Terminal: relative arguments now emit the absolute path, absolute ones are unchanged, non-existent files and inline displays still emit nothing, unreadable or error results still fall back to the argument, and run_command is untouched.
Related to #30051
Custom metadata attached to a file upload now reaches the vector DB, but the model still never sees it. Both prompt-assembly paths build their output from a fixed field set: the classic RAG <source> tag carries only id, name and resource type, and the retrieval tools return only content, source and file id per chunk. A scraper that records where each document came from therefore cannot get that origin in front of the model, so answers cannot state it.
RAG_SOURCE_METADATA_KEYS names the chunk metadata keys allowed through to the model. Configured keys are emitted as extra attributes on the <source> tag and as extra fields on tool result chunks, covering both retrieval paths. It is empty by default, so nothing changes for existing deployments.
An allowlist instead of passing everything through, because chunk metadata also carries file hashes, collection names, embedding config and relevance scores, which would then be added to every retrieved chunk of every request. Values are attacker-controllable through an uploaded file, so they are escaped before they go into the tag, and a configured key can never displace a field the tag or the chunk already defines.
Reported in open-webui/open-webui#29486.
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Uploading an .svg to a chat attached it as a vision image input, so the model received a data URI it could not decode. PIL-backed servers answered "cannot identify image file" and OpenAI answered "The image data you provided does not represent a valid image". No setting made it work.
SVG now takes the ordinary file upload path, so its XML source is extracted and indexed and the model can answer questions about it. Rasterizing was the alternative and it would have discarded the part of an SVG a model reads best, the source itself. Raster formats are untouched and still go up as image inputs.
A shared helper replaces the ad hoc image/ prefix checks at the points that decide image input versus document, on both ends. It normalises the content type first, because a stored "image/SVG+xml" or a trailing charset parameter slipped past a plain comparison.
One behaviour change worth knowing: an SVG now needs the model to have the file upload capability, where before it rode in as an image.
Fixes#30100
Sending an image or file with no typed text to a model with skills
bound replaced the (empty) message text with the list of skill names,
so the model answered with its skill catalog instead of handling the
attachment. The empty-message guard added for #24929 fired on any
empty last user text without checking for attachments.
The guard now skips the fallback when the current message carries
files, read from the user_message object the frontend sends with the
request. Attachment-only messages then go out exactly as they do on
models without skills. A bare skill selection with no attachment still
gets the fallback, so the provider 400 from #24929 stays fixed.
Request-level files were not usable as the signal: that list carries
the model's knowledge and folder files, so a bare skill selection on a
knowledge model would have gone out empty again.
Fixes#30040
The comments on the opt-in in-place append made it sound like the fast path
can lose streamed text under normal operation. The only way the field can be
emptied is an allocation failure, which means the host is already out of
memory, and the default path (which copies the whole accumulated string on
every chunk) raises in that situation as well. Reword both comments to state
that condition so the flag is not read as unsafe.
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Pressing stop saved the assistant message as finished while its output items were still marked as running, so the affected block kept showing "Thinking...", "Analyzing..." or "Executing...". That state was written to the database, so it came back after every reload. A tool call cancelled mid-execution was affected as well: it is marked completed as soon as its arguments finish streaming, well before the tool returns, and the client reads that as still executing until the result item arrives.
Cancelling now closes those items before the message is saved, marking them incomplete, which is the status the client already treats as finished without flagging an error. Tool calls waiting for approval are left untouched so their approval prompt survives a reload. The corrected output is sent on the chat:tasks:cancel event that was already being emitted, so an open tab settles immediately instead of only after a reload.
Emitting a chat:completion event instead would have fired response auto-copy, text to speech playback and the chat finished listeners on a response the user had just cancelled.
Verified on a running instance against a mock upstream: cancelling mid-response leaves no item marked as running in the saved message, and the identical run on unpatched code leaves one.
Fixes#29281
When a tool returns a base64 image, Open WebUI only moves it out of the model's context if the entire result is that image, or if the tool is MCP. An image sitting inside a returned object or a list was serialised into the tool message instead, so a single screenshot could cost hundreds of thousands of tokens, push out the rest of the conversation and leave the model answering from garbage.
Any string in a tool result that is exactly one image data URI is now moved into the result's files wherever it sits in the structure, and replaced with a short marker. The model gets the image as an attachment rather than as text, and it renders for the user instead of being dropped.
Detection is deliberately limited to values that are entirely a data URI. Scanning inside longer strings was tried and abandoned: a payload wrapped over several lines, or one followed by text, gets cut short, and shipping a truncated image is worse than the bloat because the provider rejects the whole request.
This also fixes the OpenAPI branch removing entries from the list it was iterating over, which skipped every second data URI and left it in the model's context.
Fixes#29208
