diff --git a/README.md b/README.md
index 963dbc824..07ba3cf55 100644
--- a/README.md
+++ b/README.md
@@ -164,7 +164,7 @@ All commands support `--json` for machine-readable output.
 
 Press <kbd>⌘</kbd><kbd>J</kbd> to open the AI assistant. It has 100+ tools that can create shapes, set fills and strokes, manage auto-layout, work with components and variables, run boolean operations, analyze design tokens, and export assets. Bring your own API key for OpenRouter, Anthropic, OpenAI, Google AI, Z.ai, MiniMax, or compatible endpoints. No backend, no account.
 
-Not every provider works in the browser, and not every model streams tool calls correctly. See [BYOK provider & model compatibility](docs/byok-providers.md) for measured results — contributions welcome.
+Not every provider works in the browser, and not every model streams tool calls correctly. See [BYOK provider & model compatibility](packages/docs/programmable/byok-provider-compatibility.md) for measured results — contributions welcome.
 
 ### Coding agents (desktop)
 
diff --git a/packages/docs/programmable/byok-provider-compatibility.md b/packages/docs/programmable/byok-provider-compatibility.md
index 9ee04e631..5143bc7ab 100644
--- a/packages/docs/programmable/byok-provider-compatibility.md
+++ b/packages/docs/programmable/byok-provider-compatibility.md
@@ -85,24 +85,24 @@ The `Tools` cells use `prompts, bad ID deltas, valid arguments`: for example,
 call; ID counts cover inspected streamed tool-call deltas; argument counts cover completed calls
 whose concatenated argument fragments parse as JSON.
 
-| Model                                 | Provider | /1M in–out     | Ctx¹ | Tools                                              | Vision | Verdict                                                                                               | Tested     |
-| ------------------------------------- | -------- | -------------- | ---- | -------------------------------------------------- | ------ | ----------------------------------------------------------------------------------------------------- | ---------- |
-| `mistral-small-3.2-24b-instruct-2506` | Scaleway | €0.15 – €0.35  | 128k | ✅ 3/3 prompts · 0/238 bad IDs · 6/6 valid args    | ✅     | **Recommended** — cheapest with vision, fully clean                                                   | 2026-07-31 |
-| `gemma-4-26b-a4b-it`                  | Scaleway | €0.25 – €0.50  | 256k | ✅ 3/3 prompts · 0/77 bad IDs · 8/8 valid args     | ✅     | Same but 2× the context — pick this for large documents                                               | 2026-07-31 |
-| `gpt-oss-120b`                        | Scaleway | €0.15 – €0.60  | 128k | ✅ 3/3 prompts · 0/118 bad IDs · 3/3 valid args    | ❌     | Cheap and clean, but text-only                                                                        | 2026-07-31 |
-| `qwen3.6-35b-a3b`                     | Scaleway | €0.25 – €1.50  | 128k | ✅ 3/3 prompts · 0/106 bad IDs · 9/9 valid args    | ✅     | Clean; heavy reasoner, needs the larger budget                                                        | 2026-07-31 |
-| `qwen3.5-397b-a17b`                   | Scaleway | €0.60 – €3.60  | 256k | ✅ 3/3 prompts · 0/92 bad IDs · 10/10 valid args   | ✅     | Most calls per turn; strongest but priciest here                                                      | 2026-07-31 |
-| `mistral-medium-3.5-128b`             | Scaleway | €1.50 – €7.50  | 256k | — not tested                                       | ✅     | Vision confirmed; tool calling unverified                                                             | 2026-07-31 |
-| `glm-5.2`                             | Scaleway | €1.80 – €5.50  | 256k | — not tested                                       | ❌     | API rejects images: "not a multimodal model"                                                          | 2026-07-31 |
-| `moonshotai/Kimi-K2.7-Code`           | Nebius   | $0.95 – $4.00  | 262k | ✅ 3/3 prompts · 0/114 bad IDs · 4/4 valid args²   | ❌     | Clean, but pricier than the Scaleway set                                                              | 2026-07-30 |
-| `moonshotai/Kimi-K3`                  | Nebius   | $3.00 – $15.00 | 1M   | ✅ 3/3 prompts · 0 bad IDs³ · 8/8 valid args²      | ❌     | Flawless, but ~20× the cost of `gpt-oss-120b`                                                         | 2026-07-30 |
-| `moonshotai/kimi-k3`                  | TensorX  | —              | —    | ⚠️ 2/3 prompts · 0 bad IDs³ · 7/7 valid args²      | —      | One prompt did not emit a call                                                                        | 2026-07-30 |
-| `openai/gpt-oss-120b`                 | Nebius   | $0.15 – $0.60  | 128k | ❌ final argument chunk routed to the wrong index² | ❌     | Broken on Nebius only — same model is fine on Scaleway                                                | 2026-07-30 |
-| `moonshotai/Kimi-K2.6`                | Nebius   | —              | —    | ⚠️ 1/3 prompts²                                    | —      | Finished on `stop`, not `length` — likely a real failure, but re-test at 16k before trusting this row | 2026-07-30 |
+| Model                                 | Provider | /1M in–out     | Ctx¹ | Tools                                                       | Vision | Verdict                                                                                               | Tested     |
+| ------------------------------------- | -------- | -------------- | ---- | ----------------------------------------------------------- | ------ | ----------------------------------------------------------------------------------------------------- | ---------- |
+| `mistral-small-3.2-24b-instruct-2506` | Scaleway | €0.15 – €0.35  | 128k | ✅ 3/3 prompts · 0/238 bad IDs · 6/6 valid args             | ✅     | **Recommended** — cheapest with vision, fully clean                                                   | 2026-07-31 |
+| `gemma-4-26b-a4b-it`                  | Scaleway | €0.25 – €0.50  | 256k | ✅ 3/3 prompts · 0/77 bad IDs · 8/8 valid args              | ✅     | Same but 2× the context — pick this for large documents                                               | 2026-07-31 |
+| `gpt-oss-120b`                        | Scaleway | €0.15 – €0.60  | 128k | ✅ 3/3 prompts · 0/118 bad IDs · 3/3 valid args             | ❌     | Cheap and clean, but text-only                                                                        | 2026-07-31 |
+| `qwen3.6-35b-a3b`                     | Scaleway | €0.25 – €1.50  | 128k | ✅ 3/3 prompts · 0/106 bad IDs · 9/9 valid args             | ✅     | Clean; heavy reasoner, needs the larger budget                                                        | 2026-07-31 |
+| `qwen3.5-397b-a17b`                   | Scaleway | €0.60 – €3.60  | 256k | ✅ 3/3 prompts · 0/92 bad IDs · 10/10 valid args            | ✅     | Most calls per turn; strongest but priciest here                                                      | 2026-07-31 |
+| `mistral-medium-3.5-128b`             | Scaleway | €1.50 – €7.50  | 256k | — not tested                                                | ✅     | Vision confirmed; tool calling unverified                                                             | 2026-07-31 |
+| `glm-5.2`                             | Scaleway | €1.80 – €5.50  | 256k | — not tested                                                | ❌     | API rejects images: "not a multimodal model"                                                          | 2026-07-31 |
+| `moonshotai/Kimi-K2.7-Code`           | Nebius   | $0.95 – $4.00  | 262k | ✅ 3/3 prompts · 0/114 bad IDs · 4/4 valid args²            | ❌     | Clean, but pricier than the Scaleway set                                                              | 2026-07-30 |
+| `moonshotai/Kimi-K3`                  | Nebius   | $3.00 – $15.00 | 1M   | ✅ 3/3 prompts · ID coverage unavailable³ · 8/8 valid args² | ❌     | Flawless, but ~20× the cost of `gpt-oss-120b`                                                         | 2026-07-30 |
+| `moonshotai/kimi-k3`                  | TensorX  | —              | —    | ⚠️ 2/3 prompts · ID coverage unavailable³ · 7/7 valid args² | —      | One prompt did not emit a call                                                                        | 2026-07-30 |
+| `openai/gpt-oss-120b`                 | Nebius   | $0.15 – $0.60  | 128k | ❌ final argument chunk routed to the wrong index²          | ❌     | Broken on Nebius only — same model is fine on Scaleway                                                | 2026-07-30 |
+| `moonshotai/Kimi-K2.6`                | Nebius   | —              | —    | ⚠️ 1/3 prompts²                                             | —      | Finished on `stop`, not `length` — likely a real failure, but re-test at 16k before trusting this row | 2026-07-30 |
 
 ¹ Nominal catalog context limit from models.dev, retrieved 2026-07-31; not measured here.  
 ² Measured with `max_tokens: 2000`; re-test failures at 16384 or the highest supported budget.  
-³ The original notes recorded no malformed IDs but not the total inspected delta count.
+³ The original notes did not preserve the inspected ID-delta count, so ID coverage is unavailable.
 
 ### Auto-lookup via models.dev
 
@@ -126,8 +126,7 @@ it was wrong on two of seven:
 
 It also lists `nebius/openai/gpt-oss-120b` as vision `false` while marking the Scaleway copy
 `true` — the same model, contradicting itself — and reports `tool_call: true` for every model
-here, including `qwen3.6-35b-a3b` (silent on 2/3 prompts) and Nebius's `gpt-oss-120b` (broken by
-the deployment bug below).
+here, including `qwen3.6-35b-a3b` (silent on 2/3 prompts at `max_tokens: 2000`, but 3/3 at 16384) and Nebius's `gpt-oss-120b` (broken by the deployment bug below).
 
 That's the general shape of it: models.dev describes a model's **nominal** capabilities, while
 what breaks in practice is a property of the **deployment**. Catalog prices and context windows
@@ -217,9 +216,15 @@ reasoning models will fail it spuriously.
 
 Add a row, keep it dated, and say how you tested. Negative results are as useful as positive ones.
 
-### 1. Test CORS
+### 1. Test CORS for an OpenAI-compatible endpoint
 
-Run these checks from a shell. Curl is not subject to CORS, so this inspects the headers a browser
+The following recipes use the OpenAI-compatible `/chat/completions` contract, Bearer
+authentication, and request body. Do not use them unchanged for a provider's native API: adapt the
+endpoint, authentication, version headers, and body first. For example, Anthropic's native API uses
+`/v1/messages`, `x-api-key`, `anthropic-version`, and
+`anthropic-dangerous-direct-browser-access: true`.
+
+Run these checks from a Bash-compatible shell. Curl is not subject to CORS, so this inspects the headers a browser
 would enforce. A provider must pass both checks: the preflight must allow the origin, `POST` method,
 and requested headers, and a successful POST must include `Access-Control-Allow-Origin`.
 
@@ -227,31 +232,50 @@ Read the key without placing it in shell history or the curl process arguments.
 configuration is owner-readable only and is removed on exit.
 
 ```bash
+set -euo pipefail
 BASE="https://api.example.com/v1"
 MODEL="MODEL"
 ORIGIN="https://openpencil.dev"
 read -rsp "API key: " API_KEY; printf '\n'
 CURL_CONFIG="$(mktemp)"
+PREFLIGHT_HEADERS="$(mktemp)"
+POST_HEADERS="$(mktemp)"
 chmod 600 "$CURL_CONFIG"
-trap 'rm -f "$CURL_CONFIG"' EXIT
+trap 'rm -f "$CURL_CONFIG" "$PREFLIGHT_HEADERS" "$POST_HEADERS"' EXIT
 printf 'header = "Authorization: Bearer %s"\n' "$API_KEY" > "$CURL_CONFIG"
 unset API_KEY
 
+origin_allowed() {
+  local file="$1"
+  local value
+  value="$(awk 'BEGIN { IGNORECASE=1 } /^access-control-allow-origin:/ { sub(/^[^:]+:[[:space:]]*/, ""); sub(/\r$/, ""); print; exit }' "$file")"
+  [[ "$value" == "*" || "$value" == "$ORIGIN" ]]
+}
+
 # Browser preflight: verify the origin, POST method, and both requested headers.
-curl -sD - -o /dev/null -X OPTIONS "$BASE/chat/completions" \
+preflight_status="$(curl -sS -D "$PREFLIGHT_HEADERS" -o /dev/null -w '%{http_code}' \
+  -X OPTIONS "$BASE/chat/completions" \
   -H "Origin: $ORIGIN" \
   -H "Access-Control-Request-Method: POST" \
-  -H "Access-Control-Request-Headers: authorization,content-type" \
-  | grep -iE '^HTTP|^access-control-allow-(origin|methods|headers):'
+  -H "Access-Control-Request-Headers: authorization,content-type")"
+[[ "$preflight_status" =~ ^2[0-9][0-9]$ ]]
+origin_allowed "$PREFLIGHT_HEADERS"
+grep -iqE '^access-control-allow-methods:.*(^|[,[:space:]])POST([,[:space:]]|$)' "$PREFLIGHT_HEADERS"
+grep -iqE '^access-control-allow-headers:.*(^|[,[:space:]])authorization([,[:space:]]|$)' "$PREFLIGHT_HEADERS"
+grep -iqE '^access-control-allow-headers:.*(^|[,[:space:]])content-type([,[:space:]]|$)' "$PREFLIGHT_HEADERS"
 
 # Successful response: use a valid key and model, then verify the origin header again.
-curl --config "$CURL_CONFIG" -sD - -o /dev/null -X POST "$BASE/chat/completions" \
+post_status="$(curl --config "$CURL_CONFIG" -sS -D "$POST_HEADERS" -o /dev/null -w '%{http_code}' \
+  -X POST "$BASE/chat/completions" \
   -H "Origin: $ORIGIN" \
   -H "content-type: application/json" \
-  -d "{\"model\":\"$MODEL\",\"max_tokens\":5,\"messages\":[{\"role\":\"user\",\"content\":\"hi\"}]}" \
-  | grep -iE '^HTTP|^access-control-allow-origin:'
+  -d "{\"model\":\"$MODEL\",\"max_tokens\":5,\"messages\":[{\"role\":\"user\",\"content\":\"hi\"}]}")"
+[[ "$post_status" =~ ^2[0-9][0-9]$ ]]
+origin_allowed "$POST_HEADERS"
 ```
 
+These commands exit non-zero unless both responses satisfy the browser contract.
+
 Also repeat the POST with an invalid key and record error-response CORS separately. It does not
 prove whether successful requests work, but it determines whether users see useful authentication
 errors or only an opaque network failure.
@@ -263,9 +287,10 @@ tokens when supported; if the endpoint accepts less, record its highest supporte
 
 ```bash
 STREAM_FILE="$(mktemp)"
-trap 'rm -f "$CURL_CONFIG" "$STREAM_FILE"' EXIT
+HTTP_STATUS_FILE="$(mktemp)"
+trap 'rm -f "$CURL_CONFIG" "$PREFLIGHT_HEADERS" "$POST_HEADERS" "$STREAM_FILE" "$HTTP_STATUS_FILE"' EXIT
 
-curl --config "$CURL_CONFIG" -sN -X POST "$BASE/chat/completions" \
+curl --config "$CURL_CONFIG" -sS -N -X POST "$BASE/chat/completions" \
   -H "content-type: application/json" \
   -d "{\"model\":\"$MODEL\",\"stream\":true,\"max_tokens\":16384,
        \"messages\":[{\"role\":\"user\",\"content\":\"Draw a frog: green ellipse body, two white eye circles, a mouth line. Use create_node for each.\"}],
@@ -273,7 +298,8 @@ curl --config "$CURL_CONFIG" -sN -X POST "$BASE/chat/completions" \
          \"parameters\":{\"type\":\"object\",\"properties\":{\"type\":{\"type\":\"string\",\"enum\":[\"ELLIPSE\",\"RECTANGLE\",\"LINE\",\"TEXT\"]},
          \"x\":{\"type\":\"number\"},\"y\":{\"type\":\"number\"},\"width\":{\"type\":\"number\"},\"height\":{\"type\":\"number\"},
          \"fill\":{\"type\":\"string\"}},\"required\":[\"type\",\"x\",\"y\"]}}}]}" \
-  > "$STREAM_FILE"
+  -o "$STREAM_FILE" -w '%{http_code}' > "$HTTP_STATUS_FILE"
+[[ "$(cat "$HTTP_STATUS_FILE")" =~ ^2[0-9][0-9]$ ]]
 ```
 
 Parse each SSE event as JSON, group fragments by tool-call index, require an ID on the first delta
@@ -283,6 +309,7 @@ for each index, and validate the concatenated arguments:
 STREAM_FILE="$STREAM_FILE" node <<'JS'
 const fs = require('node:fs')
 const calls = new Map()
+const finishReasons = new Set()
 let malformedFirstDeltas = 0
 
 for (const line of fs.readFileSync(process.env.STREAM_FILE, 'utf8').split(/\r?\n/)) {
@@ -290,7 +317,9 @@ for (const line of fs.readFileSync(process.env.STREAM_FILE, 'utf8').split(/\r?\n
   const data = line.slice(5).trim()
   if (!data || data === '[DONE]') continue
   const event = JSON.parse(data)
-  for (const call of event.choices?.[0]?.delta?.tool_calls ?? []) {
+  const choice = event.choices?.[0]
+  if (choice?.finish_reason) finishReasons.add(choice.finish_reason)
+  for (const call of choice?.delta?.tool_calls ?? []) {
     const current = calls.get(call.index)
     if (!current) {
       if (typeof call.id !== 'string' || !call.id) malformedFirstDeltas++
@@ -310,7 +339,20 @@ for (const [index, call] of calls) {
     console.error(`tool call ${index}: invalid arguments`)
   }
 }
-console.log({ calls: calls.size, malformedFirstDeltas, invalidArguments })
+console.log({
+  calls: calls.size,
+  finishReasons: [...finishReasons],
+  malformedFirstDeltas,
+  invalidArguments
+})
+if (!calls.size) {
+  console.error(
+    finishReasons.has('length')
+      ? 'no tool calls: output budget exhausted; retry with a larger budget'
+      : 'no tool calls: model finished without calling a tool'
+  )
+  process.exitCode = 1
+}
 if (malformedFirstDeltas || invalidArguments) process.exitCode = 1
 JS
 ```