Cairn
NousResearch/hermes-agent

xAI grok-4.3 drops optional multiline string MCP args

Cluster 58345 · agent. Data as of

3 open items. Fix attempted, not merged.

The short answer

1open issue
2open PRs
3items grouped
Known?
Yes. 3 related items grouped here, 0 issues already closed.
Fix event
No fix has been merged to main. see the attempts below.
Tracker
The maintainers' tracker marks this unresolved. That is separate from the fix event.
Still open
1 issue and 2 PRs.

A bug where xAI grok-4.3 omits optional multiline string arguments in MCP tool calls, causing issues like blank emails. Addressed via a schema fix promoting optional string params to required and documentation warnings.

Open issues1

  • Issue#58345[Bug]: xAI grok-4.3 drops optional multiline string args from MCP tool calls — AgentMail sends blank emails (docs recommend the affected combo)

Open PRs2

  • PR#58351docs(xai): warn grok-4.3 drops optional multiline string args from MCP tool calls
  • PR#58352fix(schema): promote optional string params to required for xAI (#58345)
How this cluster was grouped
  • Link evidence (structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
  • Pairwise link density 0.67: the share of item 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.

Pick up a Lab task

Check whether a fix covers the open issues here, with your own agent. Bring back evidence for maintainers.

Open the Lab

At a glance

Subsystem
agent
Closed issues
0
Attempts
0 PRs closed without merging

For your agent

The same facts, typed.

cluster/58345.json
cluster/58345.md