# Hermes Hub UI state contract

- Contract version: **1.2**
- Published against: **`9ffc815ed59f7fd364e176ffef20bf29d545bc46`**
- Contract owner: `antigravity/release-readiness`
- Consumer: `codex/ui-redesign`

This document describes the backend state that the native UI may render. It is
descriptive of the code at the published commit. Fields marked **real** are
backed by persisted configuration, authentication metadata, runtime health or
provider responses. Fields marked **derived** are computed from real fields.
Fields marked **estimated** or **placeholder** must be labelled as such or
hidden by the UI.

---

## 1. Snapshot boundary

### `HubSnapshot`

Defined in `router/state_store.py` as a frozen dataclass.

| Field | Type | Reality and meaning |
|---|---|---|
| `generation` | `int` | **Real local sequence.** Monotonically increases for every accepted rebuild within one process. Starts at 1; an empty bootstrap snapshot uses 0. |
| `seq` | `int` | **Real request sequence token.** Monotonically increasing counter of the latest completed refresh request. Guaranteed to equal or exceed `generation`. |
| `timestamp` | `float` | **Real local time** (`time.time()`) when the snapshot was built. |
| `profiles_by_provider` | `dict[str, list[ProfileViewModel]]` | **Derived** normalized profiles grouped by provider. |
| `all_profiles` | `dict[str, ProfileViewModel]` | **Derived** map keyed by `profile_id`. Profile IDs are unique by this map. |
| `readiness` | `SystemReadiness` | **Derived** readiness summary. |
| `agents` | `list[AgentViewModel]` | **Derived** current role assignments with active quota and session tracking. |
| `providers` | `list[ProviderSummary]` | **Derived** provider summaries. |
| `routing` | `dict[str, RolePipeline]` | **Derived** routing pipelines keyed by role ID. |
| `quotas` | `dict[str, QuotaSnapshot]` | Keyed by `profile_id`; see provider truth matrix below. |
| `metrics` | `dict[str, Any]` | **Real local diagnostics:** generation, sequence, build duration, profile counts and refresh counters. |
| `is_stale` | `bool` | `True` for uninitialized bootstrap snapshots or when background refresh is overdue (> 300s). |

Consistency guarantees:

- The store publishes one snapshot reference after building it under an `RLock`; readers never observe a partially-built snapshot.
- `generation` and `seq` are public comparison keys for the UI.
- Stale background worker responses (`seq < _latest_applied_seq`) are strictly rejected and discarded.
- `get_snapshot()` returns the cached snapshot without blocking disk scans.

---

## 2. Account and health models

### `ProfileViewModel`

| Field | Type | Optional | Reality and meaning |
|---|---|---:|---|
| `profile_id` | `str` | no | **Real configuration slot/profile ID.** |
| `display_name` | `str` | no | **Real configured name** when present; otherwise localized slot fallback. |
| `account_identity` | `str` | no | Best available identifier: email → display name → provider account ID → profile ID. |
| `provider` | `str` | no | **Real normalized provider ID.** |
| `provider_display_name` | `str` | no | **Derived localized/display label.** |
| `assigned_roles` | `list[str]` | no | **Derived from router config.** |
| `primary_role` | `str` | yes | **Derived/configured.** May be absent for spare slots. |
| `is_main_account` | `bool` | no | **Real local profile preference.** |
| `is_main_orchestrator` | `bool` | no | **Derived from orchestrator chain.** |
| `auth_state` | `str` | no | Normalized auth state (`AUTHENTICATED`, `AUTH_REQUIRED`, `AUTH_EXPIRED`, `NOT_CONFIGURED`). |
| `health_state` | `str` | no | Normalized health state (`healthy`, `quota_exhausted`, `rate_limited`, `cooldown`, `disabled`, `cold_spare`, `not_configured`, `unhealthy`). |
| `health_label_ru` | `str` | no | **Derived presentation label.** |
| `model_states` | `dict[str, ModelFamilyHealth]` | no | **Derived from local health tracker/runtime observations.** |
| `cooldown_remaining_sec` | `int` | no | **Derived local runtime state.** Zero when healthy. |
| `last_checked_at` | `str` | yes | **Real local check time string** (`%H:%M:%S`). |
| `enabled` | `bool` | no | **Real config state.** |
| `is_cold_spare` | `bool` | no | **Derived/configured.** |
| `is_empty_slot` | `bool` | no | **Derived** placeholder slot with no configured auth. |
| `email` | `str` | no | Extracted from saved auth/JWT claims; empty string if unavailable. |
| `plan` | `str` | no | Display text (e.g. `"Тариф: MAX"`, `"Тариф: PRO"`). |
| `plan_code` | `str` | no | Normalized code (`PRO`, `PLUS`, `MAX`, `SUPERGROK`, `UNKNOWN`). |
| `plan_source` | `str` | no | **Real provenance:** `"provider_api"`, `"jwt_claim"`, `"provider_auth"`, `"inferred"`, `"unknown"`. UI uses this to display `PlanBadge` only when trustworthy (`!= "unknown"`). |
| `quota_snapshot` | `QuotaSnapshot` | yes | Associated quota snapshot object. |
| `preferred_models` | `list[str]` | no | **Real config/model-discovery values.** |

---

## 3. Quota models

### `QuotaSnapshot`

| Field | Type | Reality and meaning |
|---|---|---|
| `account_id` | `str` | Real local profile/account key. |
| `provider` | `str` | Real normalized provider ID. |
| `buckets` | `list[QuotaBucket]` | Separate capacity pools; never combine them into one percent. |
| `fetched_at` | timezone-aware `datetime` | Real local collection time. |
| `stale_after_seconds` | `int` | Local cache TTL, default 300 seconds. |
| `source` | `str` | Provenance: `"runtime_event"`, `"jwt_claim"`, `"provider_auth"`, `"baseline"`, `"unconfigured"`. |
| `unavailable_reason` | `Optional[str]` | Human-readable reason when data cannot be collected. |
| `is_estimated` | property | `True` for baseline/unconfigured; `False` for verified runtime events and provider claims. |

### `QuotaBucket`

| Field | Type | Notes |
|---|---|---|
| `id` | `str` | Stable bucket key (`antigravity.claude.5h`, `antigravity.gemini.5h`, `codex.primary.weekly`, `claude.session.5h`, `grok.frequent_tasks`). |
| `display_name` | `str` | User-facing label (`"Claude 5h"`, `"Gemini 5h"`, `"Codex Weekly"`). |
| `model_family` | `Optional[str]` | Family selector (`"claude"`, `"gemini"`, `"gpt"`, `"grok"`, `"opencode"`). |
| `used_percent` | `Optional[float]` | 0.0–100.0 or `None` if unmeasured. |
| `remaining_percent` | `Optional[float]` | 0.0–100.0 or `None` if unmeasured. |
| `used_absolute` | `Optional[int]` | Absolute units used if reported. |
| `remaining_absolute` | `Optional[int]` | Absolute units remaining. |
| `limit_absolute` | `Optional[int]` | Absolute maximum limit. |
| `reset_at` | `Optional[datetime]` | UTC reset timestamp. |
| `reset_in_seconds` | `Optional[int]` | Seconds until quota reset. |
| `period` | `Optional[str]` | `"5h"`, `"7d"`, `"30d"`, `"sliding"`. |
| `status` | `str` | `"healthy"`, `"warning"`, `"exhausted"`, `"unknown"`. |

### Provider Truth Matrix at v1.2

| Provider | Buckets emitted | Values | Reset | Source / UI treatment |
|---|---|---|---|---|
| **Antigravity** | `antigravity.claude.5h`, `antigravity.gemini.5h` | Baseline: values `None`. On runtime 429: exact 0% remaining. | On 429: extracted from server response. Baseline: `None`. | Baseline: `baseline`, `is_estimated=True`. 429 event: `runtime_event`, `is_estimated=False`. |
| **OpenAI Codex** | `codex.primary.weekly` | Baseline: values `None`. On 429: 0% remaining. | On 429: derived. Baseline: `None`. | Baseline: `baseline`, `is_estimated=True`. |
| **Claude** | `claude.session.5h` | Baseline: values `None`. On 429: 0% remaining. | On 429: derived. Baseline: `None`. | Baseline: `baseline`, `is_estimated=True`. |
| **Grok** | `grok.frequent_tasks` | Baseline: values `None`. On 429: 0% remaining. | On 429: derived. Baseline: `None`. | Baseline: `baseline`, `is_estimated=True`. |
| **OpenCode Go** | `opencode.tasks` | Baseline: values `None`. | `None`. | Baseline: `baseline`, `is_estimated=True`. |

---

## 4. Team and routing models

### `AgentViewModel`

| Field | Type | Description |
|---|---|---|
| `role_id` | `str` | Logical role (`"orchestrator"`, `"coder-primary"`, `"reviewer"`, etc.). |
| `role_name_ru` | `str` | Localized role title (`"Главный оркестратор"`, `"Кодер 1"`). |
| `role_description_ru` | `str` | Localized role description. |
| `assigned_profile_id` | `Optional[str]` | Active profile ID assigned to this role. |
| `assigned_display_name` | `Optional[str]` | Display name of assigned profile. |
| `provider` | `str` | Active provider ID. |
| `provider_display_name` | `str` | Localized provider name. |
| `model` | `str` | Selected active model. |
| `account_identity` | `str` | Masked identity of the active account. |
| `routing_position` | `str` | `"Primary"`, `"Fallback 1"`, `"Fallback 2"`. |
| `status` | `str` | `"healthy"`, `"quota_exhausted"`, `"auth_required"`, etc. |
| `status_label_ru` | `str` | Localized status text (`"Работает"`, `"Исчерпан"`). |
| `is_active` | `bool` | True if healthy and receiving requests. |
| `is_main_orchestrator` | `bool` | True if role is orchestrator. |
| `cooldown_remaining_sec` | `int` | Active cooldown in seconds. |
| `session_id` | `Optional[str]` | Active affinity session bound to this agent. |
| `active_quota_status` | `str` | Status of governing quota bucket (`"healthy"`, `"warning"`, `"exhausted"`). |
| `active_quota_label` | `str` | Human-readable quota state (e.g. `"Осталось 85%"`, `"Доступна"`). |

### `PipelineNode` & `RolePipeline`

Each `PipelineNode` represents one failover step in a role's route:

| Field | Type | Description |
|---|---|---|
| `profile_id` | `str` | Profile ID for this step. |
| `display_name` | `str` | Slot display name. |
| `provider` | `str` | Localized provider name. |
| `model` | `str` | Model configured for this step. |
| `account_identity` | `str` | Masked account identity for this node. |
| `status` | `str` | Health status of this node (`"healthy"`, `"quota_exhausted"`). |
| `status_label_ru` | `str` | Localized status text. |
| `quota_status` | `str` | Quota health status (`"healthy"`, `"exhausted"`). |
| `is_active` | `bool` | True if this node is currently handling traffic. |
| `cooldown_remaining_sec` | `int` | Cooldown in seconds. |
| `failover_reason` | `Optional[str]` | Real reason why traffic switched from this node (e.g. `"Primary исчерпал квоту (429)"`, `"Требуется авторизация"`). `None` for active node or standby reserve. |

`RolePipeline`: `role_id`, `role_name_ru`, `default_model`, `max_failover`, `session_affinity`, `active_profile_id`, `nodes: List[PipelineNode]`.

---

## 5. Event bus contract

Callbacks receive `(event_name: str, payload: Any)`. All events carry active `generation` and `seq` tokens.

| Event Constant | Name String | Payload Contract (v1.2) | Canonical Publisher Site |
|---|---|---|---|
| `EVENT_ACCOUNT_UPDATED` | `"ACCOUNT_UPDATED"` | `{"profile_id": str, "profile": ProfileViewModel, "generation": int, "seq": int}` | `HubStateStore.apply_delta_account_updated` |
| `EVENT_ACCOUNT_ADDED` | `"ACCOUNT_ADDED"` | `{"provider": str, "profile_id": str, "profile": ProfileViewModel, "generation": int, "seq": int}` | `HubStateStore.apply_delta_account_added` |
| `EVENT_ACCOUNT_REMOVED` | `"ACCOUNT_REMOVED"` | `{"provider": str, "profile_id": str, "generation": int, "seq": int}` | `HubStateStore.apply_delta_account_removed` |
| `EVENT_ACCOUNT_AUTH_CHANGED` | `"ACCOUNT_AUTH_CHANGED"` | `{"provider": str, "profile_id": str, "auth_state": str, "generation": int, "seq": int}` | `HubStateStore.publish_auth_changed` |
| `EVENT_QUOTA_UPDATED` | `"QUOTA_UPDATED"` | `{"provider": str, "profile_id": str, "snapshot": QuotaSnapshot, "quota_snapshot": QuotaSnapshot, "generation": int, "seq": int}` | `HubStateStore.apply_delta_quota_updated` |
| `EVENT_ROUTING_UPDATED` | `"ROUTING_UPDATED"` | `{"role_id": str, "active_profile_id": str, "pipeline": RolePipeline, "generation": int, "seq": int}` | `HubStateStore.apply_delta_route_changed`, `RouterEngine.route_request` |
| `EVENT_AGENT_UPDATED` | `"AGENT_UPDATED"` | `{"role_id": str, "agent": AgentViewModel, "generation": int, "seq": int}` | `HubStateStore.apply_delta_route_changed` |
| `EVENT_SYSTEM_READINESS_CHANGED`| `"SYSTEM_READINESS_CHANGED"`| `{"readiness": SystemReadiness, "generation": int, "seq": int}` | `HubStateStore.refresh` |
| `EVENT_REFRESH_STARTED` | `"REFRESH_STARTED"` | `{"key": str, "seq": int}` | `HermesRefreshScheduler._execute_task` |
| `EVENT_REFRESH_COMPLETED` | `"REFRESH_COMPLETED"` | `{"generation": int, "seq": int, "duration_ms": float}` | `HubStateStore.refresh` |
| `EVENT_REFRESH_FAILED` | `"REFRESH_FAILED"` | `{"key": str, "error": str, "seq": int}` | `HermesRefreshScheduler._execute_task` |

---

## 6. Closed Gaps & Audit Status

| Gap ID | Description | Status | Implementation Details / Commit |
|---|---|---|---|
| **Gap 1 & 2** | Antigravity Claude vs Gemini bucket isolation & truthful 429 reset parsing | **Closed** | Multi-bucket model-family isolation in `quota_collector.py` with exact reset timestamps parsed on runtime 429 events (`2035c14`). |
| **Gap 3** | Public `seq` in `HubSnapshot` | **Closed** | `HubSnapshot.seq` exposed to UI; matches accepted refresh token (`2035c14`). |
| **Gap 5** | Stale state policy (`is_stale`) | **Closed** | Explicit policy: `is_stale=True` for uninitialized bootstrap snapshots or when age exceeds 300 seconds (`state_store.py`). |
| **Gap 6** | Plan provenance for `PlanBadge` | **Closed** | `ProfileViewModel.plan_source` added (`"provider_api"`, `"jwt_claim"`, `"provider_auth"`, `"inferred"`, `"unknown"`). UI displays badge only when trustworthy (`2035c14`). |
| **Gap 7** | `AgentViewModel` active session and quota | **Closed** | `session_id`, `active_quota_status`, and `active_quota_label` added (`2035c14`). |
| **Gap 8** | `PipelineNode` identity, quota, and failover reason | **Closed** | `account_identity`, `quota_status`, and real `failover_reason` added (`2035c14`). |
| **Gap 9** | Canonical publishers for all declared events | **Closed** | Every declared event constant has a dedicated, verified publisher in `state_store.py` / `router_engine.py`. Dead event constants removed (`2035c14`). |
| **Gap 10** | Scheduler async quota race | **Closed** | Scheduler triggers complete quota collection before invoking snapshot rebuild (`2035c14`). |
| **Gap 11** | Stale response protection verification | **Closed** | `seq` recorded only on completion; late responses strictly dropped with test proof (`2035c14`). |
| **Gap 12** | Empirical Call Telemetry & Metrics | **Closed (Self-Measured)** | `TelemetryService` captures real call latency, exact token usage reported in provider `usage`, failover events, and USD cost (when user pricing is defined). All metrics carry `source: "own_measurement"`. When no calls exist in the query window, values are `None` (`has_data=False`), never fake zeros (`antigravity/telemetry`). |

---

## 7. Active Limitations & Backend Constraints

The following constraints are active in the backend and must be strictly respected by the UI:

| Gap ID | Limitation | Constraint & UI Requirement |
|---|---|---|
| **Gap 4** | Shallow Immutability of Snapshot | `HubSnapshot` is defined with `dataclass(frozen=True)` which prevents attribute reassignments. However, contained lists and dictionaries remain standard mutable Python collections. **UI Constraint:** The UI must treat `HubSnapshot` and all nested view models as strictly read-only and must never mutate any collection or object in place. |
| **Gap 13** | Unmeasurable Provider Internals & Host Hardware | The backend cannot measure external provider server RPS, SLA uptime percentages, or system host hardware (CPU/RAM/Disk/Network) as they are irrelevant to router logic. **UI Constraint:** The UI must display `Н/Д` (Нет данных) or hide these metric cards entirely. The UI must never generate fictional numbers or render mock graphs. |

---

## 8. Telemetry & Empirical Metrics Contract

The backend exposes real empirical metrics via `TelemetryService.get().get_aggregates(...)` and `HubSnapshot.metrics["telemetry"]`:

| Field | Type | Provenance | Description / Absence Behavior |
|---|---|---|---|
| `source` | `str` | `"own_measurement"` | Always identifies measurements taken by Hermes Hub router itself. |
| `has_data` | `bool` | Empirical | `True` if at least 1 router call occurred in the window; `False` if no calls recorded. |
| `total_calls` | `int` | Empirical | Total number of invocation attempts in the window. |
| `successful_calls` | `int` | Empirical | Count of successful invocations (including successful failovers). |
| `failed_calls` | `int` | Empirical | Count of terminal failures. |
| `error_rate` | `Optional[float]` | Computed | Ratio of failed calls to total calls (`0.0` to `1.0`), or `None` if `has_data=False`. |
| `latency_p50_ms` | `Optional[float]` | Empirical | Median invocation latency in milliseconds, or `None` if `has_data=False`. |
| `latency_p95_ms` | `Optional[float]` | Empirical | 95th percentile invocation latency in milliseconds, or `None` if `has_data=False`. |
| `latency_max_ms` | `Optional[float]` | Empirical | Maximum invocation latency in milliseconds, or `None` if `has_data=False`. |
| `total_prompt_tokens` | `Optional[int]` | Provider `usage` | Sum of prompt tokens reported by providers, or `None` if no `usage` returned. |
| `total_completion_tokens` | `Optional[int]` | Provider `usage` | Sum of completion tokens reported by providers, or `None` if no `usage` returned. |
| `total_tokens` | `Optional[int]` | Provider `usage` | Sum of all tokens reported by providers, or `None` if no `usage` returned. |
| `total_cost_usd` | `Optional[float]` | User Pricing | Computed USD cost based on user-configured `pricing` in `router_profiles.yaml`, or `None` if no pricing configured. |
| `failovers_count` | `int` | Empirical | Number of failover switches from initial profile. |
| `failover_reasons` | `Dict[str, int]` | Empirical | Histogram of failover triggers (`"quota_exhausted"`, `"rate_limited"`, `"auth_required"`, etc.). |

