Jaroslav Beneš
5e75948069
The last unbuilt capability, and built the way CLAUDE.md said it had to be: a
ToolDef reaching resolve_tools plus a permission and a capability flag, not a new
code path. The only genuinely new UI is one branch in the transcript.
services/images/ is three modules. comfy.py speaks HTTP -- submit, poll /history,
fetch the PNG, /free, and an /object_info discovery for the admin page only.
Polled and not socketed, because holding a connection open for the length of a
generation is the live-connection state the whole ssh.py design forbids, and the
thing being waited for takes tens of seconds anyway. The base URL is exempt from
the SSRF guard by construction, exactly as Connection.base_url and the audio
endpoints are -- said out loud in the docstring, because a default of
127.0.0.1:8188 is precisely the shape that guard exists to refuse and therefore
reads as a hole rather than a decision.
workflow.py fills a template, and the one thing that matters is that it walks the
parsed JSON rather than the text of it. A value that is exactly "{{steps}}"
becomes the number 20; ComfyUI validates types and refuses the string. A
placeholder inside a longer string is still text, which is what makes
"{{prompt}}, masterpiece" work -- and text substitution would additionally mean a
prompt containing a quotation mark produced a document that no longer parses, on
the one input guaranteed to hold arbitrary text. Which node holds the prompt is
the administrator's statement rather than a guess from node types: sniffing for
the first CLIPTextEncode works on the shipped workflow and on nothing else, and
swaps positive for negative the first time somebody reorders them. seed has no
fixed default, because one would make every unspecified generation identical and
make the retry loop redraw the same rejected picture four times.
tool.py is one call, one finished image. Returning every attempt to the
conversation would cost a round each, make the ceiling advisory rather than
enforced, and walk the reader past every reject -- so the reviewer lives inside
the tool and is asked about *bytes*: an attempt about to be discarded should not
leave an Attachment behind, so it sees a downscaled preview built in memory and
only the kept image is written. Anything that goes wrong in review is a keep;
losing a picture because a judging request timed out would be the check
destroying the thing it was checking. The last attempt is kept whatever the
verdict, so a request always produces something. Rejects are recorded, not
stored.
Preserve VRAM unloads the chat's own connection and nothing else, because the
memory being freed belongs to one machine: local llama-swap answers GET /unload,
and a box on the network has no reason to be unloaded when ComfyUI wants memory
here. The swap goes round the review rather than round the tool, which costs two
model loads per retry -- so the two settings are independent and the page warns
when both are on. Nothing loads the LLM back: the reply's next request does, and
that step exists in the description and not in the code, so the code says so.
Two rules elsewhere had to be drawn for the first time. message_payload sends
images only on user turns -- no assistant message had ever carried one, and the
moment one does the multimodal list form on an assistant turn is rejected by
OpenAI and most local runners, breaking every later turn in the chat. And
files.store gained keep_original, because _process_image turns anything without
alpha into JPEG q85 at 1400px: right for a phone photo, a visible loss on the one
output this feature exists to produce.
/image sends the ordinary message with force_tool, which becomes tool_choice for
the first round only -- left in place the reply would draw a picture, be asked
again, and draw another. FORCEABLE_TOOLS is an allow list because the name is
read off a form.
ToolContext gained chat_id, and that fixed a tool nobody had ever successfully
run: _run_scratch_write read context.chat_id on a dataclass with no such field,
so every call raised AttributeError, swallowed by run_tool's blanket except into
"the scratch_write tool failed" -- indistinguishable from a model calling it
wrongly. The test that existed asserted the family and the risk, which are
properties of the declaration rather than of the code.
Verified against the real ComfyUI 0.27.0 on this machine rather than against
documentation: every endpoint shape here was read off it, a generation ran end to
end through the client, the reviewer was shown a matching and a mismatched prompt
and answered KEEP and RETRY correctly, and the unload hook fired for the local
llama-swap and not for the remote box.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
406 lines
23 KiB
Markdown
406 lines
23 KiB
Markdown
# LLeMbas — plan and status
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Where the project is, what is deliberately not built yet, and the decisions
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that would be expensive to revisit. Kept current as work lands; the detail of
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*how* things work lives in [`CLAUDE.md`](CLAUDE.md).
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**Status:** usable daily. Streaming chat, attachments, reasoning, tool calling
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with web search, custom HTTP tools and MCP servers, agent chats that work on a
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machine over SSH, a knowledge library, notes, memory and skills, speech in and
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out, image generation over ComfyUI, users and groups, model administration,
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installable as an app. 1676 tests, `ruff` clean.
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---
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## The shape of it
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A self-hosted web UI for OpenAI-compatible endpoints, written in Python, themed
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after Middle-earth.
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| Stack | FastAPI + Jinja + htmx + a little Alpine |
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| Build step | none — no Node, no npm, no CDN at runtime |
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| Database | SQLite, schema synchronised additively at startup |
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| Deployment | systemd unit + nginx vhost, one worker |
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These are load-bearing. Dropping the no-build rule or moving off SQLite would
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be a different project, not a refactor.
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---
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## Done
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### Chat
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- [x] Streaming replies over server-sent events
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- [x] **Markdown renders progressively** — re-rendered whole every 100ms rather
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than appending tokens, because a list or code fence is only correct once
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its context exists
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- [x] Syntax highlighting (Pygments), sanitised with nh3
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- [x] **Generation runs in the background** — a task, not the request. Navigate
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away, open another chat, close the tab: the reply keeps being written and
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reattaching replays the whole state
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- [x] **Stop** — the send button becomes Stop while writing; what arrived is kept
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- [x] **Rewind** — edit one of your own turns and the conversation runs on from
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there. Truncates rather than branching
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- [x] **Chat titles that fit the chat** — an ordinary chat is named by a model
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from the first exchange, an agent chat from its opening words alone, which
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are already an objective. Renameable from the heading and from the sidebar
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row; one response updates both
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- [x] Chats created on first message, so an abandoned composer leaves nothing
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- [x] **Unread indicator** — a green dot and a toast when a reply lands while
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you were elsewhere
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- [x] **A reply that started without you asking still arrives** — the open chat
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page polls for turns it has not got, so a background job waking the model
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appears where you are looking instead of only after a reload. Quiet while
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a reply is streaming, since that reply delivers its own bubbles
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- [x] **A turn nobody typed says so** — a background job's completion is a user
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turn on the wire, because the request needs one, and a machine event in
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the transcript: its own icon and name, no pencil, and no claim that you
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sent it
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- [x] **Folders that carry something** — arbitrarily nested, with a name, a
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description, a system prompt inherited by the chats inside them, and seeds
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for the model, the kind and the agent target. Deleting one keeps the chats
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- [x] **The sidebar splits Chat and Agent** — a switch below the pinned models,
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stored on the account, filtering the folder tree as well as the loose
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chats
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- [x] **A reply reads as the sequence it was** — thinking, prose, a tool call,
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more prose, in the order they happened, rather than three stacked zones
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with every tool block in the middle. Marks on the row index the three
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stores; a reply written before them renders exactly as it always did
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- [x] **Blocks open while the reply is still being written** — the ids are
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stable across every swap and across the final one, and opening a block
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stops the thread chasing the bottom until you scroll back down
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- [x] Per-reply metrics — tokens, context used as a percentage, tokens/second,
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live while streaming and kept afterwards. Estimated with a `~` when the
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endpoint reports no usage. Two chips: what the reply **cost** and what the
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conversation now **occupies**, each labelled, both moving between one
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usage block and the next rather than once a round
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- [x] Compaction — a button, and automatically at a configurable percentage of
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the model's context. Summarised turns are kept and collapsed, not deleted
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- [x] Temporary chats — never listed, swept after a day, with a Keep button
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- [x] An admin-only request inspector beside the thread
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- [x] **Canvas** — a third side panel holding open files, in tabs. Project files
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over SFTP in an agent chat; notes, skills, knowledge documents, this
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chat's text attachments and its own scratch document everywhere. Read with
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syntax highlighting, edited in a plain textarea, saved with a conflict
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check. Files the model touches open themselves, without taking the screen
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### Tools
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- [x] **Tool calling** — one reply is a bounded loop of requests, not one
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request. Text produced before a call is kept
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- [x] **Web search** as the first tool: DuckDuckGo (no setup), SearXNG or
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Firecrawl, chosen in the admin area
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- [x] Only offered to models flagged `tools`, because an endpoint without
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support rejects the whole request rather than ignoring the array
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- [x] Sources stay in the transcript; results are **not** replayed as context on
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the next turn, for the same reasons reasoning is not
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- [x] A round's calls run together, and the reply says which tool is running —
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a remote tool taking seconds with nothing streaming looks like a hang
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- [x] **A reply can stop and ask you something** — one or more questions on one
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card, with answers to pick from and a box to write your own, answered
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together. The same mechanism carries command approvals
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- [x] **Custom HTTP tools** — an administrator describes one call: a JSON Schema,
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a URL template, headers, an encrypted secret and how to read the answer.
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Arguments may fill a hole but never move the target: the scheme and host
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are literal, values are escaped for where they land, and the origin is
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pinned afterwards
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- [x] **MCP servers** over streamable HTTP — a hand-written client, so that
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`check_url` runs on every hop rather than being bypassed by somebody
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else's transport. Tools are discovered and cached by a button, namespaced
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per server, and a server's own descriptions are bounded before they reach
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a model as instructions
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- [x] Both gated like the built-ins — a model capability, a permission — and
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restrictable to groups, with guidance of their own on `/admin/prompts`
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- [x] Local MCP over stdio is deliberately absent: spawning a subprocess would
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run on this machine, which nothing here does
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### Image generation
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- [x] **Draws on a ComfyUI you are running**, as a tool the model chooses to
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call and as an `/image` command that makes it call one. Never on this
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machine, the same rule agent chats follow
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- [x] **Multiple workflow templates** — a name, a description and a ComfyUI API
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export with `{{prompt}}` and ten other placeholders where the values go.
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The model picks between them by their descriptions, and by checkpoint,
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falling back to the chat's usual and then the instance default when it
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names neither
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- [x] Model may set prompt, negative, seed, steps, cfg, width, height, sampler,
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scheduler, denoise, checkpoint and template; **only the prompt is
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required** and everything else has a default
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- [x] **The result is checked before you see it** — optionally, a vision model
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is shown the picture and the request and says keep or retry, up to a
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configurable number of attempts. Only clearly wrong images are retried;
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the last attempt is kept whatever it says, so a request always produces
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something
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- [x] **Preserve VRAM** — opt-in, for a machine that cannot hold both at once:
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unload the chat's own language model, generate, free ComfyUI, and let the
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next request load the model back. Per connection, so a box on the network
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is never touched
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- [x] Instance-wide extra instructions, injected into the harness beside the
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tool's own guidance
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### Agent chats
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- [x] A chat is a **Chat** or an **Agent**, chosen when it starts and fixed
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thereafter — a transcript whose earlier turns ran somewhere else is not
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one conversation. Knowledge, memories and skills are shared across both
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- [x] **Nothing runs on the LLeMbas host.** Commands go to a machine reached
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over SSH, so containment is somebody's considered choice of host — a
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container built for the job — rather than a sandbox built here. A local
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one was designed in detail and dropped; see CLAUDE.md for why
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- [x] **SSH connections are user-owned**, like notes. An administrator decides
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only whether the feature exists at all
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- [x] Trust on first use, made explicit: adding a host does not connect to it,
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**Check** shows its fingerprint with nothing sent, and only accepting
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pins it. A host that later answers with a different key is refused
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- [x] Four modes as a table over what each tool does to the world —
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**Manual** asks about everything, **Edit** writes freely but asks before
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commands, **Auto** asks about nothing, **Plan** reads freely and changes
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nothing. Switchable at any time; read once per reply
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- [x] Enforced in the generation loop, not in the prompt: a rule a model is
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merely told is one a poisoned file can argue with
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- [x] A deny list beats **Auto** for any command it can match; an allow list
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cannot be matched at all by a command containing anything that joins two
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commands together. A deny pattern cannot either — so in Auto a compound
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line runs, which is the trade for Auto not asking about `cd build && make`.
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See CLAUDE.md; matching each segment would restore both and is not built
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- [x] **The terminal and the canvas open before the chat exists** — on the
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new-chat screen, against the connection and directory being chosen there,
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and both re-point when that changes. The shell you opened and the files
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you left open are adopted into the chat when you send the first prompt
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- [x] **Background jobs are visible** — a chip in the composer row counting what
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is still running, and a panel with each job's command, state, log tail,
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how long it took and a Stop button. The dot is coloured by outcome rather
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than by status, since `done` covers exit 0 and exit 2 alike. Survives a
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restart, because the job does
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- [x] `shell_run`, `file_read`, `file_write`, `file_list` — files over SFTP,
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never through a shell, because the SSH exec protocol has no argv form
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- [x] **Plan mode ends with a plan** you can carry out with one button, which
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switches to Edit and sends it back quoted rather than as an instruction
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- [x] Per-reply budgets on steps, wall clock and output, with time spent
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waiting for you subtracted
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- [x] **A terminal panel** beside the chat, holding a real shell on that chat's
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own connection. The modes govern the model; what a person types is theirs,
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since they hold the credential and could open the same shell with an ssh
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client. The model cannot see the panel — sending it output is a button
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- [x] The shell outlives the panel and the page: closing it leaves a build
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running, and coming back reattaches with the scrollback. An idle timeout
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is what eventually ends one, and so does deleting the chat, or disabling,
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moving or deleting the connection
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- [x] **The panel is resizable**, dragged from its edge or nudged with the
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arrow keys, and the width follows you to another browser
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- [x] **It knows where one command ends and the next begins** — bash and zsh
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are given the markers VS Code and WezTerm use, so *Copy* and *Send* mean
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one command and its output rather than the last forty rows of the screen.
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An **Auto** toggle collects each one into the next message. Any other
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shell starts exactly as it did before, the buttons fall back to the
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screen and say so, and Auto is disabled rather than degraded
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- [x] **The project directory is listed for the model** — one read-only
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command, `git ls-files` where that works so `.gitignore` is honoured for
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free, budgeted so a big directory becomes a count rather than a thousand
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filenames on every request
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- [x] **A directory is chosen by browsing it** over SFTP, not by typing a path
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into an unlabelled box
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- [x] The approval mode is chosen **before** the first message, beside the
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message box rather than in the header
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### The library
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- [x] **Knowledge bases** — documents, images and saved web pages, grouped into
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named collections and ingested through the same pipeline as chat
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attachments, searched with SQLite FTS5
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- [x] A chat can be pointed at particular bases, so "answer from the contracts
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folder" is a different question from "answer from everything I have"
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- [x] **Notes** — longer things the model writes down and searches later;
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editable by hand, because they are yours
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- [x] **Memory** — short facts, injected on every turn to a budget rather than
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searched, and managed in your settings
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- [x] **Skills** — saved procedures. Only the name and description are injected;
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the body is fetched when the model decides it applies
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- [x] A model may write and revise its own notes, memories and skills. Every
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skill revision is kept, attributed and revertible — the safety story is a
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record and a way back, not a gate
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- [x] **Sharing** — a knowledge base, a note or a skill can be shared with a
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group or with named people, read-only. One visibility rule, and
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administrators do not bypass it. Documents are shared through their base
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- [x] **The harness** — an operational prompt assembled from what a model
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actually has, so the tools get used rather than ignored
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- [x] Attach menu: file, image, a web page fetched on the spot, or a document
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from the library
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- [x] **`@` to name one** — the library everywhere, and files in the project
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directory in an agent chat. The reference stays in the sentence and the
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contents come along, with the path and the machine, so the model knows
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exactly which file it was handed
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### Audio
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- [x] **Dictation** — record in the composer, transcribed by any OpenAI-shaped
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`/v1/audio/transcriptions` endpoint. The recording never touches disk
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- [x] **Read aloud** — any `/v1/audio/speech` endpoint, with the voice list
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discovered from the server where it offers one
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- [x] Instance defaults in Admin, per-reader overrides in Settings — voice,
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speed, dictation language, and whether replies play automatically
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### Models and reasoning
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- [x] OpenAI-compatible connections with encrypted keys and model discovery
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- [x] **Reasoning display** — `reasoning_content` and inline `<think>` tags,
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collapsed by default, labelled with how long it took, never replayed as
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context
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- [x] Model admin as a list plus a page per model; scales to hundreds
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- [x] Ordering, pinning (a sidebar shortcut, *not* a reordering), instance
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default, per-user default, images, capability flags
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- [x] Custom model picker showing avatars, descriptions and capabilities
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### Attachments
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- [x] Drag, paste or pick images, PDFs and text files
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- [x] Images downscaled and sent to vision models as content parts
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- [x] PDF and text extracted at upload and placed in the prompt
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- [x] Type decided by inspecting bytes, random names on disk, non-images served
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as downloads with `nosniff`
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- [x] No OCR: a scanned PDF says so rather than silently contributing nothing
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### People
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- [x] Accounts, argon2, revocable server-side sessions, self-service password
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change
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- [x] Users and groups with permissions that **union** rather than override
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- [x] Model access restricted to chosen groups
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- [x] Registration toggle, instance settings stored in the database
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### Prompts
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- [x] Three layers — instance, model, chat — with the most specific winning
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**outright** rather than being concatenated
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- [x] Every injected fragment editable at `/admin/prompts`: the tool guidance,
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the memory and skill sections, the seam above the authored prompt, and the
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request that names a chat
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- [x] `{{variables}}` with a legend, values shown as they currently resolve, and
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pass-through for anything that is not one
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- [x] A preview of the whole assembled system message, including unsaved edits
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- [x] Defaults in code and overrides in the database, so improving a default
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still reaches an instance that never edited it
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### Suggestions
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- [x] Admin-managed cards on the new-chat screen; three seeded once at startup
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### Interface
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- [x] **`/` for commands** — compact, usage, mode, model, title, the panels,
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the theme. Anything not in the table is sent as an ordinary message, and
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`//` starts one with a literal slash
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- [x] **Keyboard shortcuts** for the same jobs, listed beside the commands in
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one table so `/help` cannot go stale
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- [x] Mentions and recognised commands are marked as you type, and again in the
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transcript, so you can see what a message will do before sending it
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- [x] **Reasoning effort** per chat, with a per-model default. Sent as both
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`reasoning_effort` and `chat_template_kwargs`, and only once chosen:
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OpenAI and vLLM read the first, llama.cpp silently drops it and reads
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only the second
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- [x] **Installable** — manifest, generated PWA icons, a service worker for the
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shell and a themed offline page. The worker deliberately never touches
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`/api/`: a reply is an event stream and caching one breaks it
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- [x] Two themes (`moria`, `shire`) from one set of design tokens
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- [x] Every control sized from `--control-h`, so rows line up by construction
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- [x] Toasts and dialogs of our own; no `window.confirm` anywhere, and
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`data-prompt` for asking one line before a request goes out
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- [x] **An approval card's command can be corrected** before it is allowed, and
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the transcript says who wrote what ran
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- [x] **Refusing can say why** — "Give reason" opens a box beside Don't, and what
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you write goes back as the instruction rather than as a rejection, so the
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model carries on from it instead of spending a round asking what you meant
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- [x] Original SVG artwork generated from a single source
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### Operations
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- [x] Additive schema sync — new tables and columns applied at startup
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- [x] `deploy/` — systemd unit and nginx templates, install and update scripts
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---
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## Not built yet
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In the order they are likely to be worth doing.
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### Smaller things
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- **OCR** for scanned PDFs
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- **Conversation branching** — `Message.parent_id` exists unused; needs a UI for
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choosing between versions, which is why rewind truncates for now
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- **Chat export** (Markdown, JSON)
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- **Semantic search** in the library — the retrieval service is one call, so an
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embedding backend can go behind it without touching the tools or the UI
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- **Archived chats** — the column exists, nothing surfaces it
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- **Per-user quotas**
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---
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## Known limits
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Worth knowing before they surprise someone.
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**One worker.** The generation registry and the stop mechanism are in-process.
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Running several workers needs that state in the database or a broker, because
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the request following a reply would not necessarily land in the process writing
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it.
|
|
|
|
**A restart abandons replies in flight.** Shutdown cancels them and keeps what
|
|
each had. There is no resume.
|
|
|
|
**Schema changes are additive only.** New tables and columns apply themselves;
|
|
renames, drops and retypes are manual against the SQLite file. `MANUAL_STEPS`
|
|
in `db/migrations.py` is where such a step gets recorded.
|
|
|
|
**Attachments live on disk, unreferenced files are swept at startup.** No
|
|
deduplication, no size quota.
|
|
|
|
**Unread is polled every 10 seconds.** A push channel would be more responsive
|
|
but means an always-on connection per tab for the sake of a green dot.
|
|
|
|
**Installing needs HTTPS or localhost.** Service workers are unavailable over
|
|
plain HTTP, so a LAN install without TLS is a normal browser tab. The
|
|
microphone is unavailable for the same reason.
|
|
|
|
**Tool calling needs a model that supports it.** The `tools` flag is an
|
|
administrator's assertion, not something endpoints reliably advertise. Set it on
|
|
a model that cannot, and its replies fail rather than degrade.
|
|
|
|
**Library search is keyword, not semantic.** FTS5 ranks well and needs no
|
|
dependency or embedding endpoint, but "how do I get paid" will not find a
|
|
document that says "invoicing".
|
|
|
|
**A model can write its own skills, and they take effect at once.** Marked as
|
|
model-authored and fully revertible, but a model that has just read a hostile
|
|
page could save a skill that outlives the conversation. The mitigation is that
|
|
it is visible and undoable, not that it was prevented.
|
|
|
|
---
|
|
|
|
## Deliberate decisions
|
|
|
|
Recorded because each looks like an oversight until you know the reason.
|
|
|
|
- **No JavaScript build step.** Browser libraries are hash-pinned and committed.
|
|
A self-hosted tool should work offline and not report page views to a CDN.
|
|
- **Permissions union, never deny.** With denies, "why can this user not do X"
|
|
cannot be answered without simulating every group.
|
|
- **System prompts replace, never stack.** Two layers that disagree give the
|
|
model contradictory instructions and nobody can tell which is losing.
|
|
- **Rewind truncates, does not branch.** Branching needs a UI for choosing
|
|
between versions; "go back and try again from here" is what was asked for.
|
|
- **Pinning is a shortcut, not an ordering.** A picker whose order silently
|
|
differs from the admin screen is confusing.
|
|
- **Images only reach models marked `vision`.** Not graceful degradation: most
|
|
endpoints reject the entire request rather than ignoring an image part. Tools
|
|
are gated the same way, for the same reason.
|
|
- **Sharing grants reading, never writing.** Two people editing one note with no
|
|
history and no merge is worse than the inconvenience of copying it.
|
|
- **Memory is never shareable.** A record about a person is not content to hand
|
|
round.
|
|
- **Knowledge attached to a message is copied, not referenced.** History must not
|
|
change under a conversation because a document was edited later.
|
|
- **The harness is prepended to the authored prompt, not a fourth layer.** It
|
|
describes the machinery; the authored layers describe the behaviour. Only one
|
|
authored layer still wins.
|
|
- **Tool results are not replayed.** Like reasoning: the answer already contains
|
|
what the model made of them, and replaying stale results into every later
|
|
request wastes the window and sends small models into search loops.
|
|
- **The service worker caches the shell, never a page with a user in it.** A
|
|
cached conversation would be a snapshot that silently went stale, belonging to
|
|
whoever was signed in last.
|
|
- **Markdown rendered server-side.** One code path produces the streamed and
|
|
the stored view, so they cannot disagree.
|
|
- **This repository is public.** Deployment hostnames, ports and paths stay out
|
|
of it; `deploy/` is templates, and the real values live in private notes.
|