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Add experimental branch MCP tools - #271
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Behind the experimental gate, the branch_create, branch_list, branch_get, branch_delete, branch_start, branch_stop, branch_resize, branch_rename, and branch_update_password tools mirror the tiger branch commands. Like the other tools, they take IDs only.
Like service_get and service_create, the branch tools can include the branch's tsdbadmin password in their result and connection string. branch_get fails when no password is stored. branch_create falls back to the password from the create response, which it keeps aside since waiting replaces the branch with one that carries none.
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Adds MCP tools mirroring the
tiger branchcommands, registered only behindTIGER_EXPERIMENTAL:branch_create,branch_list,branch_get,branch_delete,branch_start,branch_stop,branch_resize,branch_rename, andbranch_update_password.branch_createandbranch_resizetake aniopsparameter. The branch tools return IOPS inresources, as the service tools do, andbranch_getalso returns the parent'sservice_name.branch_getandbranch_createtakewith_password, asservice_getandservice_createdo.branch_getfails if no password is stored, andbranch_createfalls back to the password from the create response.Follow-up: in the MCP test harness, an unexpected mock call inside a tool handler makes the test hang until the
go testtimeout instead of failing. gomock'sFatalfends the handler goroutine without a response.