simstudioai
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diff --git a/‎apps/sim/app/api/files/utils.ts‎
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diff --git a/‎apps/sim/app/api/workspaces/[id]/byok-keys/route.ts‎
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@@ -0,0 +1,257 @@
+---
+name: add-hosted-key
+description: Add hosted API key support to a tool so Sim provides the key when users don't bring their own. Use when adding hosted keys, BYOK support, hideWhenHosted, or hosted key pricing to a tool or block.
+---
+
+# Adding Hosted Key Support to a Tool
+
+When a tool has hosted key support, Sim provides its own API key if the user hasn't configured one (via BYOK or env var). Usage is metered and billed to the workspace.
+
+## Overview
+
+| Step | What | Where |
+|------|------|-------|
+| 1 | Register BYOK provider ID | `tools/types.ts`, `app/api/workspaces/[id]/byok-keys/route.ts` |
+| 2 | Research the API's pricing and rate limits | API docs / pricing page (before writing any code) |
+| 3 | Add `hosting` config to the tool | `tools/{service}/{action}.ts` |
+| 4 | Hide API key field when hosted | `blocks/blocks/{service}.ts` |
+| 5 | Add to BYOK settings UI | BYOK settings component (`byok.tsx`) |
+| 6 | Summarize pricing and throttling comparison | Output to user (after all code changes) |
+
+## Step 1: Register the BYOK Provider ID
+
+Add the new provider to the `BYOKProviderId` union in `tools/types.ts`:
+
+```typescript
+export type BYOKProviderId =
+  | 'openai'
+  | 'anthropic'
+  // ...existing providers
+  | 'your_service'
+```
+
+Then add it to `VALID_PROVIDERS` in `app/api/workspaces/[id]/byok-keys/route.ts`:
+
+```typescript
+const VALID_PROVIDERS = ['openai', 'anthropic', 'google', 'mistral', 'your_service'] as const
+```
+
+## Step 2: Research the API's Pricing Model and Rate Limits
+
+**Before writing any `getCost` or `rateLimit` code**, look up the service's official documentation for both pricing and rate limits. You need to understand:
+
+### Pricing
+
+1. **How the API charges** — per request, per credit, per token, per step, per minute, etc.
+2. **Whether the API reports cost in its response** — look for fields like `creditsUsed`, `costDollars`, `tokensUsed`, or similar in the response body or headers
+3. **Whether cost varies by endpoint/options** — some APIs charge more for certain features (e.g., Firecrawl charges 1 credit/page base but +4 for JSON format, +4 for enhanced mode)
+4. **The dollar-per-unit rate** — what each credit/token/unit costs in dollars on our plan
+
+### Rate Limits
+
+1. **What rate limits the API enforces** — requests per minute/second, tokens per minute, concurrent requests, etc.
+2. **Whether limits vary by plan tier** — free vs paid vs enterprise often have different ceilings
+3. **Whether limits are per-key or per-account** — determines whether adding more hosted keys actually increases total throughput
+4. **What the API returns when rate limited** — HTTP 429, `Retry-After` header, error body format, etc.
+5. **Whether there are multiple dimensions** — some APIs limit both requests/min AND tokens/min independently
+
+Search the API's docs/pricing page (use WebSearch/WebFetch). Capture the pricing model as a comment in `getCost` so future maintainers know the source of truth.
+
+### Setting Our Rate Limits
+
+Our rate limiter (`lib/core/rate-limiter/hosted-key/`) uses a token-bucket algorithm applied **per billing actor** (workspace). It supports two modes:
+
+- **`per_request`** — simple; just `requestsPerMinute`. Good when the API charges flat per-request or cost doesn't vary much.
+- **`custom`** — `requestsPerMinute` plus additional `dimensions` (e.g., `tokens`, `search_units`). Each dimension has its own `limitPerMinute` and an `extractUsage` function that reads actual usage from the response. Use when the API charges on a variable metric (tokens, credits) and you want to cap that metric too.
+
+When choosing values for `requestsPerMinute` and any dimension limits:
+
+- **Stay well below the API's per-key limit** — our keys are shared across all workspaces. If the API allows 60 RPM per key and we have 3 keys, the global ceiling is ~180 RPM. Set the per-workspace limit low enough (e.g., 20-60 RPM) that many workspaces can coexist without collectively hitting the API's ceiling.
+- **Account for key pooling** — our round-robin distributes requests across `N` hosted keys, so the effective API-side rate per key is `(total requests) / N`. But per-workspace limits are enforced *before* key selection, so they apply regardless of key count.
+- **Prefer conservative defaults** — it's easy to raise limits later but hard to claw back after users depend on high throughput.
+
+## Step 3: Add `hosting` Config to the Tool
+
+Add a `hosting` object to the tool's `ToolConfig`. This tells the execution layer how to acquire hosted keys, calculate cost, and rate-limit.
+
+```typescript
+hosting: {
+  envKeyPrefix: 'YOUR_SERVICE_API_KEY',
+  apiKeyParam: 'apiKey',
+  byokProviderId: 'your_service',
+  pricing: {
+    type: 'custom',
+    getCost: (_params, output) => {
+      if (output.creditsUsed == null) {
+        throw new Error('Response missing creditsUsed field')
+      }
+      const creditsUsed = output.creditsUsed as number
+      const cost = creditsUsed * 0.001 // dollars per credit
+      return { cost, metadata: { creditsUsed } }
+    },
+  },
+  rateLimit: {
+    mode: 'per_request',
+    requestsPerMinute: 100,
+  },
+},
+```
+
+### Hosted Key Env Var Convention
+
+Keys use a numbered naming pattern driven by a count env var:
+
+```
+YOUR_SERVICE_API_KEY_COUNT=3
+YOUR_SERVICE_API_KEY_1=sk-...
+YOUR_SERVICE_API_KEY_2=sk-...
+YOUR_SERVICE_API_KEY_3=sk-...
+```
+
+The `envKeyPrefix` value (`YOUR_SERVICE_API_KEY`) determines which env vars are read at runtime. Adding more keys only requires bumping the count and adding the new env var.
+
+### Pricing: Prefer API-Reported Cost
+
+Always prefer using cost data returned by the API (e.g., `creditsUsed`, `costDollars`). This is the most accurate because it accounts for variable pricing tiers, feature modifiers, and plan-level discounts.
+
+**When the API reports cost** — use it directly and throw if missing:
+
+```typescript
+pricing: {
+  type: 'custom',
+  getCost: (params, output) => {
+    if (output.creditsUsed == null) {
+      throw new Error('Response missing creditsUsed field')
+    }
+    // $0.001 per credit — from https://example.com/pricing
+    const cost = (output.creditsUsed as number) * 0.001
+    return { cost, metadata: { creditsUsed: output.creditsUsed } }
+  },
+},
+```
+
+**When the API does NOT report cost** — compute it from params/output based on the pricing docs, but still validate the data you depend on:
+
+```typescript
+pricing: {
+  type: 'custom',
+  getCost: (params, output) => {
+    if (!Array.isArray(output.searchResults)) {
+      throw new Error('Response missing searchResults, cannot determine cost')
+    }
+    // Serper: 1 credit for <=10 results, 2 credits for >10 — from https://serper.dev/pricing
+    const credits = Number(params.num) > 10 ? 2 : 1
+    return { cost: credits * 0.001, metadata: { credits } }
+  },
+},
+```
+
+**`getCost` must always throw** if it cannot determine cost. Never silently fall back to a default — this would hide billing inaccuracies.
+
+### Capturing Cost Data from the API
+
+If the API returns cost info, capture it in `transformResponse` so `getCost` can read it from the output:
+
+```typescript
+transformResponse: async (response: Response) => {
+  const data = await response.json()
+  return {
+    success: true,
+    output: {
+      results: data.results,
+      creditsUsed: data.creditsUsed,  // pass through for getCost
+    },
+  }
+},
+```
+
+For async/polling tools, capture it in `postProcess` when the job completes:
+
+```typescript
+if (jobData.status === 'completed') {
+  result.output = {
+    data: jobData.data,
+    creditsUsed: jobData.creditsUsed,
+  }
+}
+```
+
+## Step 4: Hide the API Key Field When Hosted
+
+In the block config (`blocks/blocks/{service}.ts`), add `hideWhenHosted: true` to the API key subblock. This hides the field on hosted Sim since the platform provides the key:
+
+```typescript
+{
+  id: 'apiKey',
+  title: 'API Key',
+  type: 'short-input',
+  placeholder: 'Enter your API key',
+  password: true,
+  required: true,
+  hideWhenHosted: true,
+},
+```
+
+The visibility is controlled by `isSubBlockHiddenByHostedKey()` in `lib/workflows/subblocks/visibility.ts`, which checks the `isHosted` feature flag.
+
+## Step 5: Add to the BYOK Settings UI
+
+Add an entry to the `PROVIDERS` array in the BYOK settings component so users can bring their own key. You need the service icon from `components/icons.tsx`:
+
+```typescript
+{
+  id: 'your_service',
+  name: 'Your Service',
+  icon: YourServiceIcon,
+  description: 'What this service does',
+  placeholder: 'Enter your API key',
+},
+```
+
+## Step 6: Summarize Pricing and Throttling Comparison
+
+After all code changes are complete, output a detailed summary to the user covering:
+
+### What to include
+
+1. **API's pricing model** — how the service charges (per token, per credit, per request, etc.), the specific rates found in docs, and whether the API reports cost in responses.
+2. **Our `getCost` approach** — how we calculate cost, what fields we depend on, and any assumptions or estimates (especially when the API doesn't report exact dollar cost).
+3. **API's rate limits** — the documented limits (RPM, TPM, concurrent, etc.), which plan tier they apply to, and whether they're per-key or per-account.
+4. **Our `rateLimit` config** — what we set for `requestsPerMinute` (and dimensions if custom mode), why we chose those values, and how they compare to the API's limits.
+5. **Key pooling impact** — how many hosted keys we expect, and how round-robin distribution affects the effective per-key rate at the API.
+6. **Gaps or risks** — anything the API charges for that we don't meter, rate limit dimensions we chose not to enforce, or pricing that may be inaccurate due to variable model/tier costs.
+
+### Format
+
+Present this as a structured summary with clear headings. Example:
+
+```
+### Pricing
+- **API charges**: $X per 1M tokens (input), $Y per 1M tokens (output) — varies by model
+- **Response reports cost?**: No — only token counts in `usage` field
+- **Our getCost**: Estimates cost at $Z per 1M total tokens based on median model pricing
+- **Risk**: Actual cost varies by model; our estimate may over/undercharge for cheap/expensive models
+
+### Throttling
+- **API limits**: 300 RPM per key (paid tier), 60 RPM (free tier)
+- **Per-key or per-account**: Per key — more keys = more throughput
+- **Our config**: 60 RPM per workspace (per_request mode)
+- **With N keys**: Effective per-key rate is (total RPM across workspaces) / N
+- **Headroom**: Comfortable — even 10 active workspaces at full rate = 600 RPM / 3 keys = 200 RPM per key, under the 300 RPM API limit
+```
+
+This summary helps reviewers verify that the pricing and rate limiting are well-calibrated and surfaces any risks that need monitoring.
+
+## Checklist
+
+- [ ] Provider added to `BYOKProviderId` in `tools/types.ts`
+- [ ] Provider added to `VALID_PROVIDERS` in the BYOK keys API route
+- [ ] API pricing docs researched — understand per-unit cost and whether the API reports cost in responses
+- [ ] API rate limits researched — understand RPM/TPM limits, per-key vs per-account, and plan tiers
+- [ ] `hosting` config added to the tool with `envKeyPrefix`, `apiKeyParam`, `byokProviderId`, `pricing`, and `rateLimit`
+- [ ] `getCost` throws if required cost data is missing from the response
+- [ ] Cost data captured in `transformResponse` or `postProcess` if API provides it
+- [ ] `hideWhenHosted: true` added to the API key subblock in the block config
+- [ ] Provider entry added to the BYOK settings UI with icon and description
+- [ ] Env vars documented: `{PREFIX}_COUNT` and `{PREFIX}_1..N`
+- [ ] Pricing and throttling summary provided to reviewer
@@ -1,5 +1,5 @@
 import { existsSync } from 'fs'
-import { join, resolve, sep } from 'path'
+import path from 'path'
 import { createLogger } from '@sim/logger'
 import { NextResponse } from 'next/server'
 import { UPLOAD_DIR } from '@/lib/uploads/config'
@@ -156,7 +156,7 @@ function sanitizeFilename(filename: string): string {
     return sanitized
   })
 
-  return sanitizedSegments.join(sep)
+  return sanitizedSegments.join(path.sep)
 }
 
 export function findLocalFile(filename: string): string | null {
@@ -169,17 +169,18 @@ export function findLocalFile(filename: string): string | null {
     }
 
     const possiblePaths = [
-      join(UPLOAD_DIR, sanitizedFilename),
-      join(process.cwd(), 'uploads', sanitizedFilename),
+      path.join(UPLOAD_DIR, sanitizedFilename),
+      path.join(process.cwd(), 'uploads', sanitizedFilename),
     ]
 
-    for (const path of possiblePaths) {
-      const resolvedPath = resolve(path)
-      const allowedDirs = [resolve(UPLOAD_DIR), resolve(process.cwd(), 'uploads')]
+    for (const filePath of possiblePaths) {
+      const resolvedPath = path.resolve(filePath)
+      const allowedDirs = [path.resolve(UPLOAD_DIR), path.resolve(process.cwd(), 'uploads')]
 
       // Must be within allowed directory but NOT the directory itself
       const isWithinAllowedDir = allowedDirs.some(
-        (allowedDir) => resolvedPath.startsWith(allowedDir + sep) && resolvedPath !== allowedDir
+        (allowedDir) =>
+          resolvedPath.startsWith(allowedDir + path.sep) && resolvedPath !== allowedDir
       )
 
       if (!isWithinAllowedDir) {
 
@@ -13,7 +13,23 @@ import { getUserEntityPermissions, getWorkspaceById } from '@/lib/workspaces/per
 
 const logger = createLogger('WorkspaceBYOKKeysAPI')
 
-const VALID_PROVIDERS = ['openai', 'anthropic', 'google', 'mistral', 'exa'] as const
+const VALID_PROVIDERS = [
+  'openai',
+  'anthropic',
+  'google',
+  'mistral',
+  'exa',
+  'browser_use',
+  'serper',
+  'firecrawl',
+  'linkup',
+  'perplexity',
+  'jina',
+  'google_cloud',
+  'elevenlabs',
+  'parallel_ai',
+  'brandfetch',
+] as const
 
 const UpsertKeySchema = z.object({
   providerId: z.enum(VALID_PROVIDERS),