402Signal · mcp-v0-3-1 · changes | VerifyMCPRecorded 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.io[SECURITY] mcp-v0-3-1: Stability (0.23 → fail)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64ef-7085-9eef-e0123e1e2153https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64ef-7085-9eef-e0123e1e2153Stability (0.23 → fail). Compared against 2026-09-13.Mon, 14 Sep 2026 04:08:44 GMTsecurityregressioncheck.verdict[SECURITY] mcp-v0-3-1: Authorization (unverified → partial)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64ef-7e18-b434-aecfff896de7https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64ef-7e18-b434-aecfff896de7Authorization (unverified → partial). Compared against 2026-09-13.Mon, 14 Sep 2026 04:08:44 GMTsecurityimprovementcheck.reverified[SECURITY] mcp-v0-3-1: Tool “preview” rewrote its description, which is the text the model readshttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f0-79b9-a416-0db6f739f893https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f0-79b9-a416-0db6f739f893Tool “preview” rewrote its description, which is the text the model reads. Compared against 2026-09-13.Mon, 14 Sep 2026 04:08:44 GMTsecurityneutraltool.description_changed[SECURITY] mcp-v0-3-1: Tool “route” was removedhttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f1-7573-85e4-d50352d4f97fhttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f1-7573-85e4-d50352d4f97fTool “route” was removed. Compared against 2026-09-13.Mon, 14 Sep 2026 04:08:44 GMTsecurityregressiontool.removed[SECURITY] mcp-v0-3-1: Tool “validate” rewrote its description, which is the text the model readshttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f1-7b48-9ff4-bbdabb6a254ehttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f1-7b48-9ff4-bbdabb6a254eTool “validate” rewrote its description, which is the text the model reads. Compared against 2026-09-13.Mon, 14 Sep 2026 04:08:44 GMTsecurityneutraltool.description_changed[SECURITY] mcp-v0-3-1: A breaking change shipped without a version bump (still 0.5.0)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f2-75e9-b581-ed36ec232e1fhttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a09e1a-64f2-75e9-b581-ed36ec232e1fA breaking change shipped without a version bump (still 0.5.0). Compared against 2026-09-13.Mon, 14 Sep 2026 04:08:44 GMTsecurityregressionserver.breaking_without_version_bump[SECURITY] mcp-v0-3-1: Injection markers (unverified → pass)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c38-7dca-9b68-2ecf338db4b6https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c38-7dca-9b68-2ecf338db4b6Injection markers (unverified → pass). Compared against 2026-09-12.Sun, 13 Sep 2026 04:08:00 GMTsecurityimprovementcheck.reverified[SECURITY] mcp-v0-3-1: Authorization (Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c3a-758b-8c0d-374fa146f74ahttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c3a-758b-8c0d-374fa146f74aAuthorization (Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.). Compared against 2026-09-12.Sun, 13 Sep 2026 04:08:00 GMTsecurityneutralcheck.reason[SECURITY] mcp-v0-3-1: Tool “preview” rewrote its description, which is the text the model readshttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c3f-780d-9f67-141d448e69f4https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c3f-780d-9f67-141d448e69f4Tool “preview” rewrote its description, which is the text the model reads. Compared against 2026-09-09.Sun, 13 Sep 2026 04:08:00 GMTsecurityneutraltool.description_changed[SECURITY] mcp-v0-3-1: Tool “route” rewrote its description, which is the text the model readshttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c40-7963-b48b-a860deb346cehttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c40-7963-b48b-a860deb346ceTool “route” rewrote its description, which is the text the model reads. Compared against 2026-09-09.Sun, 13 Sep 2026 04:08:00 GMTsecurityneutraltool.description_changed[SECURITY] mcp-v0-3-1: Tool “validate” rewrote its description, which is the text the model readshttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c42-705a-91e2-ea969ab0ca88https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a098f3-5c42-705a-91e2-ea969ab0ca88Tool “validate” rewrote its description, which is the text the model reads. Compared against 2026-09-09.Sun, 13 Sep 2026 04:08:00 GMTsecurityneutraltool.description_changed[SECURITY] mcp-v0-3-1: Stability (0.07 → unverified)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7213-7b19-af38-a16ad8e0b5a1https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7213-7b19-af38-a16ad8e0b5a1Stability (0.07 → unverified). Compared against 2026-09-08.Wed, 09 Sep 2026 22:00:05 GMTsecurityregressioncheck.unverifiable[SECURITY] mcp-v0-3-1: Tool safety (pass → unverified)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7215-750c-af8a-378284209f81https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7215-750c-af8a-378284209f81Tool safety (pass → unverified). Compared against 2026-09-08.Wed, 09 Sep 2026 22:00:05 GMTsecurityregressioncheck.unverifiable[SECURITY] mcp-v0-3-1: Authorization (Authorisation not fully verified: no authorisation is required to connect, but we couldn't read the tool list to see what that exposes.)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7215-7c1b-b495-52298cb1a879https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7215-7c1b-b495-52298cb1a879Authorization (Authorisation not fully verified: no authorisation is required to connect, but we couldn't read the tool list to see what that exposes.). Compared against 2026-09-08.Wed, 09 Sep 2026 22:00:05 GMTsecurityneutralcheck.reason[SECURITY] mcp-v0-3-1: Endpoint reachability (reachable → not serving MCP)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7217-7a5f-a1ae-fe86c91d202ahttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a0882f-7217-7a5f-a1ae-fe86c91d202aEndpoint reachability (reachable → not serving MCP). Compared against 2026-09-08.Wed, 09 Sep 2026 22:00:05 GMTsecurityregressioncapture.status_changed[SECURITY] mcp-v0-3-1: Tool “preview” rewrote its description, which is the text the model readshttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a07f37-6b6a-7320-a5a7-b50834064a52https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a07f37-6b6a-7320-a5a7-b50834064a52Tool “preview” rewrote its description, which is the text the model reads. Compared against 2026-09-07.Tue, 08 Sep 2026 04:12:13 GMTsecurityneutraltool.description_changed[SECURITY] mcp-v0-3-1: Tool “route” rewrote its description, which is the text the model readshttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a07f37-6b6a-7e01-ae2a-00e48d9365f7https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a07f37-6b6a-7e01-ae2a-00e48d9365f7Tool “route” rewrote its description, which is the text the model reads. Compared against 2026-09-07.Tue, 08 Sep 2026 04:12:13 GMTsecurityneutraltool.description_changed[SECURITY] mcp-v0-3-1: Tool “validate” rewrote its description, which is the text the model readshttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a07f37-6b6b-76aa-8f74-dfb7f3c0d22dhttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a07f37-6b6b-76aa-8f74-dfb7f3c0d22dTool “validate” rewrote its description, which is the text the model reads. Compared against 2026-09-07.Tue, 08 Sep 2026 04:12:13 GMTsecurityneutraltool.description_changed[SECURITY] mcp-v0-3-1: Transport (fail → pass)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd7-7e44-b13c-ede8e0b35b8dhttps://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd7-7e44-b13c-ede8e0b35b8dTransport (fail → pass). Compared against 2026-09-05.Sun, 06 Sep 2026 04:09:45 GMTsecurityimprovementcheck.verdict[SECURITY] mcp-v0-3-1: Injection markers (unverified → pass)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd8-764d-b936-eb5c9dfdef37https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd8-764d-b936-eb5c9dfdef37Injection markers (unverified → pass). Compared against 2026-09-05.Sun, 06 Sep 2026 04:09:45 GMTsecurityimprovementcheck.reverified[SECURITY] mcp-v0-3-1: First check of Judged manipulation (pass)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd8-7a87-9219-144723bf7a77https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd8-7a87-9219-144723bf7a77First check of Judged manipulation (pass). Compared against 2026-09-05.Sun, 06 Sep 2026 04:09:45 GMTsecurityneutralcheck.appeared[SECURITY] mcp-v0-3-1: Authorization (Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.)https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd9-711f-a9cc-151151d03ce9https://verifymcp.io/servers/402signalhq-402signal/mcp-v0-3-1#chg-chg_01a074e8-6fd9-711f-a9cc-151151d03ce9Authorization (Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.). Compared against 2026-09-05.Sun, 06 Sep 2026 04:09:45 GMTsecurityneutralcheck.reason