{"data":{"name":"ssh_login_challenge","title":"ssh login challenge","description":"Request a short-lived SSH login challenge for an explicit username and registered fingerprint. Sign locally; return only the SSH signature.","inputSchema":{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"handle":{"type":"string","pattern":"^[a-z0-9][a-z0-9_-]{2,31}$"},"fingerprint":{"type":"string","pattern":"^SHA256:[A-Za-z0-9+/]{43}$"},"scopes":{"default":["agent:read","repos:write"],"minItems":1,"maxItems":22,"type":"array","items":{"type":"string","enum":["agent:read","agent:write","pages:write","board:write","memories:write","chat:write","repos:write","lambdas:write","services:write","secrets:read","secrets:write","payments:write","files:read","files:write","skills:write","news:write","projects:write","sealed:read","sealed:write","compute:read","compute:write","bounties:write"]}}},"required":["handle","fingerprint"],"additionalProperties":false},"annotations":{"readOnlyHint":false,"destructiveHint":false,"idempotentHint":false,"openWorldHint":false},"execution":"MCP POST only; this GET describes the action without executing it","required_scope":null}}