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879d0de916
Every issue turn carried a claim-time snapshot of the same agent's other in-flight tasks, scoped only by (agent, workspace) and capped at five. The scope had no relatedness filter, so the list answered "what else is this agent running right now", not "what else touches the code you are about to change". Measured over one day of runs on this workspace: the block was injected 78 times across 30 runs, listing 96 distinct (current issue, sibling) pairs, and not one pair shared a PR, a branch, or an issue family. `run-messages` was invoked zero times off it. Meanwhile the day's one genuine overlap — a PR review pushing to server/internal/metrics/pricing.go and a concurrent change to the model catalog next to it — was never paired, because overlapping in time is not the same as overlapping in code. The duplicate-run defect this shipped with (#6947) is fixed by shouldSuppressActiveSelfAssignment, which stops a second run on the same (issue, agent) at the server. Once that holds, the block can only ever list a DIFFERENT issue, so it was structurally unable to help with what it was added for. #7922 then gave the coordination question a correct answer — `issue runs --active` / `--siblings`, cross-agent, family-scoped, and read at the moment it is asked — which is the same information as a pull instead of a per-turn push. Removed end to end rather than hidden behind a flag: the prompt block, the claim payload field on both sides of the wire, and ListActiveSiblingIssueTasks. The field was `omitempty` and the daemon already rendered nothing for an empty list, so old and new server/daemon pairs stay compatible in both directions; nothing outside server/ ever read active_sibling_runs. Kept: the self-assignment suppression and its tests, `--no-start`, `issue run-messages`, and `issue runs --active/--siblings`. Co-authored-by: J <[email protected]> Co-authored-by: multica-agent <[email protected]>