[Feature]: seeing what Codex is doing

[cardoso-neto]

Before submitting

• I searched existing issues and did not find a duplicate.
• I am describing a concrete problem or use case, not just a vague idea.

Area

apps/web

Problem or use case

Certain toolcalls don't have any info on them. I infer it was monitoring a task or an agent based on thread context. But without /ps or /agents, I can't tell for sure.

Proposed solution

Showing the exact toolcall Codex ran being displayed. Truncate, but click to expand. Show what subagents are doing in the sidebar instead of just that they're active.

Why this matters

Can't tell if the agent is hung (as in waiting for something that'll never finish).

Smallest useful scope

Exactly what Codex CLI currently has would be ok.

[cardoso-neto]

somewhat related: #538
If that were implemented, it'd supercede this one. But that's probably much more complex.