* fix(access-control): default every operation picker to one the group allows
The block editor's operation dropdown already hid operations whose tool the
caller's permission group denies, but it seeded its default without waiting for
that config. `usePermissionConfig` resolves as "nothing denied" while its query
is in flight, so a freshly dropped block persisted the static first operation —
and nothing revisits a field that already holds a value, so the correction that
arrived with the config never applied. A user whose group denies `slack_message`
still got a Slack block sitting on Send Message. The model combobox already had
this guard; the dropdown did not.
Consolidates the rule behind `lib/permission-groups/operation-access` and
`useOperationAccess`, which resolves an operation to its tool without guessing
(an unresolvable one stays visible; the server gate stays authoritative) and
withholds a default until the config has loaded, so seeding on a defined value
is the whole guard.
Applies it to every surface that offers or seeds an operation:
- block editor dropdown — default now waits for the config
- agent block tool list — operations were not gated at all; the picker now hides
denied ones, drops blocks whose every operation is denied, and defaults to the
first allowed
- canvas search / connection picker — the tool-operation index was filtered only
by the block allowlist, so denied operations were still offered as one-click
block drops
- block creation — a declared default operation the group denies is replaced
with the first allowed one, and a denied preset operation is discarded
* fix(access-control): gate the seeded model too, and collapse the seed rule
Block creation seeds `model` the same way it seeds `operation`: `agent`,
`router` and `evaluator` all declare `defaultValue: 'claude-sonnet-5'`, and
`prepareBlockState` wrote it unconditionally. The model combobox only fills a
field that is empty, so a group denying that model (or the Anthropic provider)
got an Agent block pre-filled with a model it cannot run — the same bug as the
operation one, on the other axis the permission group governs.
Rather than a second bespoke gate, `prepareBlockState` now takes one veto,
`isSeededValueAllowed(subBlockId, value)`, and seeds nothing when a declared
default is denied. Nothing substitutes a replacement there any more: the
editor's own permission-aware pickers already resolve the right one and only
fill an empty field, and substituting in the store would drift from
`getDefaultBlockName`, which names a block after its *declared* default. That
also deletes `firstAllowedOperation` and its copy of subblock-option
enumeration.
Review follow-ups:
- `usePermissionConfig` gains `isModelUsable` (denylist AND provider allowlist);
the combobox's two hand-rolled copies of that pair now call it
- `isToolAllowed`/`isModelAllowed` index their denylists — the gate calls them
once per option of every block offered, so a linear scan made a check's cost
scale with denylist length (measured 3.2ms -> 0.30ms per search-index build
at 500 denied tools)
- `useOperationAccess` had three members with three different loading
semantics, one documented as unsafe alone; it now exposes one withholding
`resolveOperationGate`
- the agent tool picker derived its option list twice with the empty-id filter
on only one path; both callers now share one `{ options, denied }` result
- `OPERATION_SUBBLOCK_ID` was a verbatim copy of the private constant in
`canvas-sentence.ts`, doc comment included; that file now imports it
* chore: trim restating comments and a dead coalesce
Cleanup-pass findings on this branch's own lines: comments that restated the
code they sat on, a four-line note whose sibling said the same in one, and a
`?? undefined` on a non-nullable value. The comment on the tool-picker filter
now explains the clause that actually needed it (an empty option list is not a
denied one) instead of narrating the filter.
Left alone as pre-existing and out of scope: the inline `staleTime` literal in
`useAllowedIntegrationsFromEnv`, and the Operation selector's raw label /
plain `Combobox` — both byte-identical to staging and matching the convention
of every sibling field in that panel.
* fix(access-control): seed nothing restricted when the config is unknown
Block creation is one-shot, so the withholding pattern the editor's pickers use
does not transfer: withholding the predicate there meant `prepareBlockState`
seeded the declared `operation`/`model` defaults unchecked, and nothing
revisits a field that already holds a value — so a block added before the
permission config resolved kept a model the group may deny.
Both restricted fields now seed empty until the config is known; the pickers
fill them the moment it resolves. A preset operation is still honoured in that
window: unlike a declared default it is the user's explicit pick, and the
server gates the run.
* fix(access-control): make the loading rule structural, not a convention
Two review bots found the same class of bug in two more places, which is the
real finding: "never persist from a predicate that reads as unrestricted while
the config loads" was a rule each callsite re-implemented, and the rule had
already been forgotten twice.
Closes both reported instances and moves the rule somewhere it cannot be
forgotten again:
- `useOperationAccess.resolveSeedGate` now owns the creation-time veto for both
restricted fields, so `workflow.tsx` states no policy of its own — it asks for
a gate and passes it on. Previously the model half of the invariant was
carried by an operation-shaped object that merely happened to be absent
during the same window.
- The agent tool picker and both operation selectors close while the config is
unknown. Every list they offer — blocks, operations, MCP and custom tools —
reads as unrestricted for that beat, and each pick is a one-shot write.
- A preset operation goes through the same gate as a declared default. It comes
from the search index, which is itself unfiltered while loading, so it is not
the informed pick it looks like.
- `isPermissionLoading` is exposed from one hook, so all four surfaces read the
same symbol instead of four spellings of the same condition.
Also from the review passes: dropped `isModelAllowed`/`isProviderAllowed` from
the public interface (consolidating onto `isModelUsable` left them with no
external consumer), un-exported `resolveOperationToolId` (no non-test caller),
and corrected the `isSeededValueAllowed` TSDoc, which still described the
contract the previous commit replaced.
Tests: replaced a case that asserted its own fixture rather than the code with
coverage of the two guard branches that were genuinely untested — an empty-string
and a non-string declared default must bypass the gate, since both mean "nothing
was declared" rather than a value to authorize.
* fix(access-control): only gate a model field the provider allowlist is about
The seed gate ran `isModelUsable` on every subblock named `model`, but
`getProviderFromModel` resolves chat models and falls back to `ollama` for
everything else. 28 of the 44 seeded model defaults in the registry are
embedding, speech, image, video or search ids — so for any group with a
provider allowlist that omits Ollama, those blocks were created with an empty
model.
Adds `findProviderFromModel`, the non-guessing half of `getProviderFromModel`,
which returns `null` where the registry declares nothing. `isModelUsable` now
treats an unresolved id as not-a-provider-choice and leaves it alone, matching
the rule the operation gate already follows: never guess, and let the server
stay authoritative. `getProviderFromModel` delegates to it, so there is one
resolution path and its ollama fallback is unchanged.
This also repairs the same misjudgement where it predates the branch: the model
combobox filtered its options through the identical provider check, so those 28
defaults were already being hidden from their own pickers for allowlisted
groups.
The dead `try/catch` around the old call went with it — `getProviderFromModel`
returns a fallback rather than throwing for an unknown id.
A workspace to build, deploy and manage AI agents and workflows.
Quickstart
Cloud-hosted: sim.ai
Self-hosted
git clone https://github.com/simstudioai/sim.git && cd sim
bun install
bun run setup
Capabilities
- Connect 1,000+ integrations and every major LLM
- Add Slack, Notion, HubSpot, Salesforce, databases, and more
- Build agents visually, conversationally, or with code
- Ingest files, knowledge bases, and structured table data
- Monitor runs, logs, schedules, and workflow activity
One workspace, every surface
Chat and workflows are just the start — tables, files, and knowledge all live in the same workspace.
Tables — a database, built in |
Files — one store for your team and every agent |
Knowledge — your agents' memory |
Self-hosting
bun run setup is an interactive wizard: it provisions the database, generates secrets, writes your .env files, connects a Chat API key, and starts Sim the way you choose:
- Local dev — run from source to contribute or hack on Sim
- Docker Compose — a self-contained instance for testing self-hosting
- Kubernetes (Helm) — deploy to a local cluster
When it finishes, open http://localhost:3000.
Reconfigure an optional capability without rerunning the full wizard:
bun run setup status
bun run setup email
bun run setup storage
bun run setup sandbox
bun run setup jobs
bun run setup cache
bun run setup knowledge
bun run setup llm
bun run setup integration slack
bun run setup status detects the effective local-dev, Docker Compose, or current-context
Helm configuration and reports configured, missing, or invalid capabilities and OAuth
integrations without printing credential values. This is separate from bun run sim status,
which reports whether installed services are running and healthy.
Manage your install with bun run sim:
bun run sim start | stop | restart # bring your install up / down / cycle
bun run sim update # pull/rebuild and apply Compose images
bun run sim status # what's installed and healthy
bun run sim logs # follow logs
bun run sim doctor # diagnose configuration problems
bun run sim down # remove containers (data kept)
bun run sim reset # archive .env and wipe managed data
sim detects how you're running (Docker Compose, local dev, or Kubernetes) and acts accordingly.
Prefer a bare sim? Run bun link once — but note sim lands in ~/.bun/bin, which Homebrew's bun doesn't add to your PATH, so you may need export PATH="$HOME/.bun/bin:$PATH" in your shell profile.
Sim also supports local models via Ollama and vLLM. See the self-hosting docs for details.
Chat API Keys
Chat is a Sim-managed service. bun run setup connects a Chat API key for you — sign in when it opens your browser and the key is stored automatically. To view, create, or revoke keys later, go to sim.ai/selfhost/settings/chat-keys.
Environment Variables
See the environment variables reference for the full list, or apps/sim/.env.example for defaults.
Tech Stack
Next.js · Bun · PostgreSQL · Drizzle · Better Auth · Tailwind — and the rest of the stack
- Framework: Next.js (App Router)
- Runtime: Bun
- Database: PostgreSQL with Drizzle ORM
- Authentication: Better Auth
- Schema Validation: Zod
- UI: Shadcn, Tailwind CSS
- Streaming Markdown: Streamdown
- State Management: Zustand, TanStack Query
- Flow Editor: ReactFlow
- Docs: Fumadocs
- Monorepo: Turborepo
- Realtime: Socket.io
- Background Jobs: Trigger.dev
- Remote Code Execution: E2B
- Isolated Code Execution: isolated-vm
Contributing
We welcome contributions! Please see our Contributing Guide for details.
License
This project is licensed under the Apache License 2.0 - see the LICENSE file for details.




