{"repo":"NousResearch/hermes-agent","public_id":"125299","display_label":"Multimodal sentinel encoding breaks alternation repair","summary":"A bug where alternation repair mishandles sentinel-encoded multimodal turns, causing raw base64 image data to be incorrectly merged into text. Two related fixes address decoding and structural merging of these encoded turns before repair runs.","subsystem":null,"counts":{"members":4,"open_issues":0,"open_issues_distinct":0,"open_prs":0,"closed_issues":1,"merged_prs":1,"attempt_prs":2},"landed_fix":{"status":"merged_to_main","basis":"structural","pr":130549,"merged_at":"2026-10-03T11:00:10+00:00"},"resolution":{"state":"resolved","by":"pr-130549"},"freshness":{"state":"verified","last_verified_at":"2026-10-03T11:00:10+00:00","is_stale":false},"grouping":{"backbone":"STRUCTURAL_SPANNING","link_density":0.5},"fix_edges":[{"issue_number":125299,"pr_number":130549,"tier":"verified","basis":"closing_ref","confidence":0.95,"recoverable_from_timeline":true,"pr_merged_at":"2026-10-03T11:00:10+00:00"}],"members":[{"kind":"issue","number":125299,"title":"[Bug]: alternation repair merges a \\x00json:-encoded image message into text after proactive prune: 426K-char base64 sent to the model, undecodable row","url":null,"state":"closed"},{"kind":"pr","number":125331,"title":"fix(agent): decode sentinel-encoded multimodal turns before the alternation repair (#125299)","url":null,"state":"closed","close_reason":{"refs":[{"kind":"commit","value":"9d7b78f0c6","number":0},{"kind":"commit","value":"790d6eaf39","number":0}],"category":"implemented_elsewhere","implication":"superseded"},"merged":false},{"kind":"pr","number":125335,"title":"fix(agent): merge sentinel-encoded multimodal user rows structurally in alternation repair","url":null,"state":"closed","close_reason":{"refs":[{"kind":"commit","value":"9d7b78f0c6","number":0},{"kind":"commit","value":"d4ca0af996","number":0},{"kind":"pr","value":"#125299","number":125299},{"kind":"pr","value":"#125331","number":125331}],"category":"implemented_elsewhere","implication":"superseded"},"merged":false},{"kind":"pr","number":130549,"title":"fix(agent): image turns restored from history are no longer sent to the model as raw base64 text (#125299, salvage #125331)","url":null,"state":"merged","close_reason":{"category":"merged"},"merged":true,"is_fix_pr":true,"fix_tier":"verified","files_changed":["agent/agent_runtime_helpers.py","contributors/emails/[redacted:email]","tests/agent/test_message_sequence_repair.py"]}],"trust":{"default_tier":"verified","includes_suggested":false}}