Recorded changes to this MCP component: tools, parameters, capabilities, advisories and trust-score checks. Security-relevant changes by default; append ?materiality=all for everything.https://verifymcp.iohttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a18a5e-ca1e-78c1-8a8e-70c5c231b90ehttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a18a5e-ca1e-78c1-8a8e-70c5c231b90eHTTPS (unverified → fail). Compared against 2026-10-29.Fri, 30 Oct 2026 01:13:50 GMTsecurityregressioncheck.reverifiedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1648e-b8a1-7177-a584-6f393b4d65f3https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1648e-b8a1-7177-a584-6f393b4d65f3Tool “solve” rewrote its description, which is the text the model reads. Compared against 2026-10-22.Thu, 22 Oct 2026 17:00:37 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a16421-6fdd-783f-9f61-8ab9abb55befhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a16421-6fdd-783f-9f61-8ab9abb55befTool “cite” rewrote its description, which is the text the model reads. Compared against 2026-10-22.Thu, 22 Oct 2026 15:01:15 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a16421-6fe1-7185-8a41-5f6d3428b90chttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a16421-6fe1-7185-8a41-5f6d3428b90cThe server rewrote its instructions, which are the text every model session reads. Compared against 2026-10-22.Thu, 22 Oct 2026 15:01:15 GMTsecurityneutralserver.instructions_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-4575-749e-ab14-e9899a816acehttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-4575-749e-ab14-e9899a816aceTool “compute_step” rewrote its description, which is the text the model reads. Compared against 2026-10-19.Mon, 19 Oct 2026 21:00:30 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-4577-7261-93f2-1ae4aef70850https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-4577-7261-93f2-1ae4aef70850Tool “run_dataset” rewrote its description, which is the text the model reads. Compared against 2026-10-19.Mon, 19 Oct 2026 21:00:30 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-4578-7b64-87d7-14e0f9db339chttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-4578-7b64-87d7-14e0f9db339cTool “run_trajectory” rewrote its description, which is the text the model reads. Compared against 2026-10-19.Mon, 19 Oct 2026 21:00:30 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-457a-7424-9ffd-8ee10f6257f6https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-457a-7424-9ffd-8ee10f6257f6Tool “verify_dataset” rewrote its description, which is the text the model reads. Compared against 2026-10-19.Mon, 19 Oct 2026 21:00:30 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-457e-701f-be1f-60f307c22e77https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-457e-701f-be1f-60f307c22e77Tool “verify_receipt” rewrote its description, which is the text the model reads. Compared against 2026-10-19.Mon, 19 Oct 2026 21:00:30 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-4582-718f-82bf-7b8714522ba2https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a155f7-4582-718f-82bf-7b8714522ba2Tool “verify_tape” rewrote its description, which is the text the model reads. Compared against 2026-10-19.Mon, 19 Oct 2026 21:00:30 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a28-754a-acbd-375b2506b454https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a28-754a-acbd-375b2506b454Tool “describe_card” rewrote its description, which is the text the model reads. Compared against 2026-10-18.Mon, 19 Oct 2026 00:23:12 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a29-7131-bd87-c71f5db839dahttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a29-7131-bd87-c71f5db839daTool “describe_solver” rewrote its description, which is the text the model reads. Compared against 2026-10-18.Mon, 19 Oct 2026 00:23:12 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a29-7cdc-ab3b-ac529d5ba452https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a29-7cdc-ab3b-ac529d5ba452Tool “find_model” rewrote its description, which is the text the model reads. Compared against 2026-10-18.Mon, 19 Oct 2026 00:23:12 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a2a-73ae-864f-466af2114b7ahttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a2a-73ae-864f-466af2114b7aTool “list_cards” rewrote its description, which is the text the model reads. Compared against 2026-10-18.Mon, 19 Oct 2026 00:23:12 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a2a-7aba-b6a9-2b8deef6c77dhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a2a-7aba-b6a9-2b8deef6c77dTool “list_solvers” rewrote its description, which is the text the model reads. Compared against 2026-10-18.Mon, 19 Oct 2026 00:23:12 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a2b-7612-8a7c-eb0135e89630https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a2b-7612-8a7c-eb0135e89630Tool “validate_series” rewrote its description, which is the text the model reads. Compared against 2026-10-18.Mon, 19 Oct 2026 00:23:12 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a2b-7d3c-be0f-26267d455423https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a2b-7d3c-be0f-26267d455423Tool “verify_solution” rewrote its description, which is the text the model reads. Compared against 2026-10-18.Mon, 19 Oct 2026 00:23:12 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a30-75ad-ab74-701d5063173ahttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a1518a-7a30-75ad-ab74-701d5063173aThe server rewrote its instructions, which are the text every model session reads. Compared against 2026-10-18.Mon, 19 Oct 2026 00:23:12 GMTsecurityneutralserver.instructions_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14dab-cb19-78ee-ac4e-345ce9dd5319https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14dab-cb19-78ee-ac4e-345ce9dd5319The server rewrote its instructions, which are the text every model session reads. Compared against 2026-10-18.Sun, 18 Oct 2026 06:21:05 GMTsecurityneutralserver.instructions_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14b73-79a2-73b3-a890-0a6d392756fdhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14b73-79a2-73b3-a890-0a6d392756fdTool “find_flip” rewrote its description, which is the text the model reads. Compared against 2026-10-17.Sat, 17 Oct 2026 20:00:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14b73-79a3-75e4-9066-ae61150036d8https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14b73-79a3-75e4-9066-ae61150036d8Tool “run_dataset” rewrote its description, which is the text the model reads. Compared against 2026-10-17.Sat, 17 Oct 2026 20:00:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14b73-79a4-757d-b87b-5758a5aa66a5https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14b73-79a4-757d-b87b-5758a5aa66a5Tool “verify_dataset” rewrote its description, which is the text the model reads. Compared against 2026-10-17.Sat, 17 Oct 2026 20:00:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14b73-79a4-795a-89ea-3bbf2fe1a6bbhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14b73-79a4-795a-89ea-3bbf2fe1a6bbTool “verify_tape” rewrote its description, which is the text the model reads. Compared against 2026-10-17.Sat, 17 Oct 2026 20:00:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14b73-79a9-77ba-9622-8e0228c8500fhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14b73-79a9-77ba-9622-8e0228c8500fThe server rewrote its instructions, which are the text every model session reads. Compared against 2026-10-17.Sat, 17 Oct 2026 20:00:21 GMTsecurityneutralserver.instructions_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14768-10b1-7ae3-b07c-e2ac377f3b4ahttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14768-10b1-7ae3-b07c-e2ac377f3b4aTool “find_model” rewrote its description, which is the text the model reads. Compared against 2026-10-16.Sat, 17 Oct 2026 01:09:24 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14768-10b4-7c72-9bd2-ba9102e8307ehttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14768-10b4-7c72-9bd2-ba9102e8307eTool “list_cards” rewrote its description, which is the text the model reads. Compared against 2026-10-16.Sat, 17 Oct 2026 01:09:24 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14768-10b5-73b5-a581-bbb2f807df0ahttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14768-10b5-73b5-a581-bbb2f807df0aTool “list_solvers” rewrote its description, which is the text the model reads. Compared against 2026-10-16.Sat, 17 Oct 2026 01:09:24 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14768-10b5-7956-9d38-c22d52036894https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14768-10b5-7956-9d38-c22d52036894Tool “validate_series” rewrote its description, which is the text the model reads. Compared against 2026-10-16.Sat, 17 Oct 2026 01:09:24 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14768-10b6-780a-b642-b7cebdd53b72https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14768-10b6-780a-b642-b7cebdd53b72Tool “verify_receipt” rewrote its description, which is the text the model reads. Compared against 2026-10-16.Sat, 17 Oct 2026 01:09:24 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9837-782f-9d87-40b63385b705https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9837-782f-9d87-40b63385b705Tool “find_flip” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-983d-71c3-8919-ed10e5d8d760https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-983d-71c3-8919-ed10e5d8d760Tool “find_model” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-984b-7eed-94c9-a9a32fc2cb6chttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-984b-7eed-94c9-a9a32fc2cb6cTool “list_cards” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-98a3-70c5-93bd-1bee1552197chttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-98a3-70c5-93bd-1bee1552197cTool “list_solvers” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-98a3-779c-ace7-5a7f47d447a5https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-98a3-779c-ace7-5a7f47d447a5Tool “run_dataset” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9907-73fc-9b67-9bc91e6222a7https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9907-73fc-9b67-9bc91e6222a7Tool “run_trajectory” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-996f-7e5e-82b9-7eda2c9f301chttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-996f-7e5e-82b9-7eda2c9f301cTool “solve” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9973-7bc4-94c8-330cf5095cd9https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9973-7bc4-94c8-330cf5095cd9Tool “validate_series” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-99de-7edd-a0e1-98d4ad4dbdc0https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-99de-7edd-a0e1-98d4ad4dbdc0Tool “verify_dataset” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9a3f-7854-a95d-e56ee42747b9https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9a3f-7854-a95d-e56ee42747b9Tool “verify_receipt” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9a41-74ff-b0ef-f4a6f9ab9f57https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9a41-74ff-b0ef-f4a6f9ab9f57Tool “verify_solution” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9aa0-7d7e-a998-c66a682bb739https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9aa0-7d7e-a998-c66a682bb739Tool “verify_step” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9af8-7551-ae4e-ad7d65999f20https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9af8-7551-ae4e-ad7d65999f20Tool “verify_tape” rewrote its description, which is the text the model reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9b6e-7e94-b15c-20ae143ac5e5https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a14242-9b6e-7e94-b15c-20ae143ac5e5The server rewrote its instructions, which are the text every model session reads. Compared against 2026-10-15.Fri, 16 Oct 2026 01:10:21 GMTsecurityneutralserver.instructions_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-6a14-7c28-aacf-677555aabbbfhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-6a14-7c28-aacf-677555aabbbfTool “cite” rewrote its description, which is the text the model reads. Compared against 2026-10-14.Thu, 15 Oct 2026 01:09:27 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-6c72-70fc-94ab-d355ab850278https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-6c72-70fc-94ab-d355ab850278Tool “describe_card” rewrote its description, which is the text the model reads. Compared against 2026-10-14.Thu, 15 Oct 2026 01:09:27 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-6d37-7cc1-ab6e-5cf90a19d58dhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-6d37-7cc1-ab6e-5cf90a19d58dTool “describe_solver” rewrote its description, which is the text the model reads. Compared against 2026-10-14.Thu, 15 Oct 2026 01:09:27 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-6f2c-73f2-84f3-5a01eef1dce1https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-6f2c-73f2-84f3-5a01eef1dce1Tool “find_flip” rewrote its description, which is the text the model reads. Compared against 2026-10-14.Thu, 15 Oct 2026 01:09:27 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-6fef-7d96-a7cc-261b836be9f9https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-6fef-7d96-a7cc-261b836be9f9Tool “find_model” rewrote its description, which is the text the model reads. Compared against 2026-10-14.Thu, 15 Oct 2026 01:09:27 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-705f-7559-8665-16dab2aa630ahttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-705f-7559-8665-16dab2aa630aTool “list_cards” rewrote its description, which is the text the model reads. Compared against 2026-10-14.Thu, 15 Oct 2026 01:09:27 GMTsecurityneutraltool.description_changedhttps://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-718b-758a-8b97-605c1818e2b4https://verifymcp.io/servers/com-zerotrustphysics-verifier/mcp#chg-chg_01a13d1b-718b-758a-8b97-605c1818e2b4Tool “list_solvers” rewrote its description, which is the text the model reads. Compared against 2026-10-14.Thu, 15 Oct 2026 01:09:27 GMTsecurityneutraltool.description_changed