Explain an unresolvable agent address in agents chat - #60
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`agents chat` speaks A2A straight to the agent, at the URL from its agent card, so a cluster-internal hostname fails with "no such host" even though the API server was reachable enough to serve the card. Report that on stderr and suggest --address, with an example built from the agent's own namespace and name. Matched on *net.DNSError with IsNotFound rather than the error text: the a2a client wraps the failure twice over, but the chain survives errors.As, and the type keeps a nonexistent name distinct from a resolver timeout or a refused connection. The hint is supplied by `agents chat` rather than built in the shared send path, so `a2a send` stays silent about an address its user typed. Assisted by Claude. Signed-off-by: Ed Snible <snible@us.ibm.com>
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Resolves #59
agents chatspeaks A2A directly to the agent, at the URL from its agent card, so a cluster-internal hostname fails withno such hosteven though the API server was reachable enough to serve the card. That failure now explains itself on stderr:It would be better if the API server gave a better URL for the agent card, but I chose to contain this as a hint within the CLI.
Assisted by Claude.
Signed-off-by: Ed Snible snible@us.ibm.com