# NousResearch/hermes-agent · browser_cdp check_fn network I/O causes schema instability

## Open now

- Nothing open on GitHub.

A bug was identified where the browser_cdp check_fn performs network I/O during tool schema evaluation, causing instability. Related fixes address keeping configured CDP endpoints schema-eligible without triggering discovery I/O.

## TL;DR

- 4 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 2 PR(s) closed without merging.
- A fix was merged to main in PR #72415. Verify it addresses your case.
- **Recommended:** read PR #72415 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `unresolved`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.50`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #70811: \[Bug\]: browser_cdp check_fn performs network I/O and makes the tool schema unstable

## Prior & competing PRs

- **#72415: fix(browser): stale browser.cdp_url stalls every CLI/Desktop startup by 10+ seconds**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `hermes_cli/doctor.py`, `tests/tools/test_browser_cdp_tool.py`, `tests/tools/test_browser_hybrid_routing.py`, `tests/tools/test_browser_lightpanda.py`, `tools/browser_cdp_tool.py`, `tools/browser_tool.py`
- **#70904: fix(browser): prevent network I/O in browser_cdp check_fn from destabilizing tool schema (#70811)**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `731aa0ccc9`, `#70811`, `#72415`, `#42059`
- **#70940: fix(browser): keep configured CDP endpoints schema-eligible without discovery I/O**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `731aa0ccc9`, `#72415`, `#42059`

## Fix status

- Merged to main in PR #72415 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-07-27`.