[Codex CLI] `browser_screenshot` causes `Your input exceeds the context window`

`browsermcp.browser_screenshot`

```
codex
Grabbing a screenshot of the active browser tab now.

tool running...
browsermcp.browser_screenshot({})

tool result (image output omitted)
⚠  stream error: stream disconnected before completion: Your input exceeds the context window of
this model. Please adjust your input and try again.; retrying 1/5 in 197ms…

...
```