ratatoskr/docs/contracts/issues/2.contract.md

---
contract_version: "2.1"
target_module: "ratatoskr.sessions"
scope: "Implement the Worldtree Conversation API session-lifecycle client for Ratatoskr. Two entry points: create_session (POST /sessions) and list_sessions (GET /sessions with cursor pagination), plus two shared frozen dataclasses (SessionInfo, SessionPage). Consumed by ratatoskr.cli for --send --new (single session create) and by ratatoskr.tui for the startup session picker (list). No core.* / worldtree.* imports; caller owns httpx.AsyncClient and Authorization header lifecycle. Convention-aligned with ratatoskr.sse_client (issue #1) — same posture, no shared types."
depends_on:
  - "httpx"
used_by:
  - "ratatoskr.cli"
  - "ratatoskr.tui"
language: "python"
complexity: "low"
estimated_loc: 150
confidence: 0.9
assumptions:
  - "Worldtree spec pin (`docs/conversation-api-spec.md` at v1.0, repo SHA `55101e909abcd2219833266b6f905c5bc956e0f0`) is the wire contract. POST /sessions response shape (§POST /sessions) and GET /sessions response shape (§GET /sessions) are read FROM the spec, not from any Worldtree source import."
  - "POST /sessions returns 201 Created with a body matching the documented shape (session_id, agent_id, message_count, created_at, last_active, metadata). The created_at/last_active fields are ISO 8601 strings with +HH:MM offsets."
  - "GET /sessions cursor pagination uses the `v1.<base64url>` envelope (§Pagination); the consumer treats cursors as opaque strings (does not parse or construct them)."
  - "Bifrost binding (Worldtree issue #160) is NOT used. create_session does not accept a `bifrost` parameter and never sends one in the request body."
open_questions:
  - "Should SessionInfo split into two dataclasses (CreatedSessionInfo with message_count vs ListedSessionInfo with archived/tags/name)? Draft uses one SessionInfo with origin-conditional fields whose defaults are codified in INV-001 (create) and INV-002 (list). Splitting would force callers to handle two types where they currently handle one; collapsing felt right for v1 but reconsider if presenters end up branching by origin."
  - "Should list_sessions transparently paginate (iterate all pages) or surface one page at a time? Draft surfaces one page (SessionPage with next_cursor). Caller decides whether to iterate. Matches Worldtree's pagination idiom and lets the TUI render lazily."
prd:
  issue: 2
  issue_url: "https://gitea.phasefinal.com/vh/ratatoskr/issues/2"
  body_sha256_16: "01fbbd52b6d90eb0"
  lock_in_comment_id: null
  lock_in_sha256_16: null
  lock_in_at: null
  pinned_at: "2026-05-21T04:45:06+00:00"
dependencies:
  - issue: 1
    path: "src/ratatoskr/sse_client.py"
    reason: "Convention dependency, not a code dependency. Issue #1 establishes the API-consumption posture (caller-owns httpx client, async-native, no Worldtree imports, response-parsing into frozen dataclasses, exception body truncation to [:1024]). sessions.py follows the same shape."
---

# Sessions — Worldtree Conversation API session lifecycle

## Context

`ratatoskr.sessions` is Ratatoskr's session-lifecycle client. Two entry points (`create_session`, `list_sessions`) plus two shared frozen dataclasses (`SessionInfo`, `SessionPage`). The module is the surface that `ratatoskr.cli` calls when `--send --new` mints a fresh session against Worldtree, and that `ratatoskr.tui` calls to populate the startup picker's `DataTable` of existing sessions.

The module deliberately does NOT cover per-turn operations (those live in `ratatoskr.sse_client`), session mutation (`PATCH /sessions/{id}` is out of scope per design-brief §4 negative clauses), or session deletion (`DELETE /sessions/{id}` is admin work via `sessions_cli.py`).

Convention-aligned with issue #1: caller owns the `httpx.AsyncClient` and Authorization header; the module never imports Worldtree source; responses are parsed into typed frozen dataclasses; exception `.body` payloads are truncated to `[:1024]` at construction.

## Data flow

**Input:**
- `httpx.AsyncClient` (caller-owned, base_url + bearer auth on the client).
- `agent_id: str` — for `create_session`.
- `include_archived: bool`, `limit: int`, `cursor: str | None` — for `list_sessions`.

**Output:**
- `create_session` → `SessionInfo`:
  - `session_id: str`
  - `agent_id: str`
  - `created_at: str` (ISO 8601 with offset)
  - `last_active: str`
  - `metadata: dict[str, Any]` (defaults to `{}` if the response omits the field — see INV-001)
  - `message_count: int | None` (present from POST response; `None` when SessionInfo was sourced from a list item per spec §GET /sessions)
  - `name: str | None` (always `None` when sourced from POST response; `None` if absent from list item; otherwise the list item's value)
  - `archived: bool` (always `False` when sourced from POST response; defaults to `False` if absent or null in a list item; otherwise the list item's value)
  - `tags: list[str]` (always `[]` when sourced from POST response; defaults to `[]` if absent or null in a list item; otherwise the list item's value)
- `list_sessions` → `SessionPage`:
  - `items: list[SessionInfo]`
  - `next_cursor: str | None` (None on the last page; opaque string otherwise)

**Side effects:** outbound HTTP only; no disk I/O, no global state.

## Invariants

- **INV-001 [hard]**: `create_session` returns a `SessionInfo` whose `session_id`, `agent_id`, `created_at`, `last_active`, and `metadata` are sourced from the 201 response body. `metadata` is taken from `body["metadata"]` when present and defaults to `{}` when absent (defensive against minor server-side spec drift; spec example always shows it present). `message_count` is taken from `body["message_count"]` (strict — bracket access, not `.get()`; the spec lists it as a response field and absent should surface as KeyError rather than silently default to None). List-only fields are fixed: `name=None`, `archived=False`, `tags=[]`.
- **INV-002 [hard]**: `list_sessions` returns a `SessionPage` where every `SessionInfo` has `session_id`, `agent_id`, `created_at`, `last_active`, and `metadata` from the response item (same defensive `metadata` default as INV-001). `name` is `item.get("name")` (may be `None`). `archived` is `item.get("archived") or False` — absent, explicit-null, or explicit-false all yield `False`; explicit-true passes through. (Note: `item.get(key, default)` only fires `default` for absent keys, NOT for explicit-null values, so the `or False` form is load-bearing here.) `tags` is `item.get("tags") or []` (absent, explicit-null, or empty list all yield `[]`; a populated list passes through). `message_count` is `None` (the list endpoint does not include it — spec §GET /sessions: "`message_count` is not included in list items").
- **INV-003 [hard]**: `list_sessions` treats cursors as opaque strings. The module never parses, base64-decodes, or constructs a cursor — it threads the server-provided `next_cursor` back verbatim on the next call. Per spec §Pagination ("Cursors are opaque to clients — do not parse or construct them.").
- **INV-004 [hard]**: Both functions truncate exception `.body` payloads to `[:1024]` at construction. Matches the issue #1 precedent (`SseConnectFailed`, `CancelFailed`).
- **INV-005 [hard]**: No `core.*` or `worldtree.*` imports. Boundary verified by `tests/test_no_worldtree_imports.py`.
- **INV-006 [hard]**: `list_sessions` rejects out-of-range `limit` values (`< 1` or `> 200`) client-side before issuing any HTTP request. Spec §GET /sessions specifies the server returns 422 on out-of-range; the client refuses to send an obviously-invalid request rather than depending on the server to reject it.

## Constraints

- **[compatibility]** Module must work against the spec pin (`55101e909abcd2219833266b6f905c5bc956e0f0`, Worldtree v0.19.0).
- **[security]** Module does not log full response bodies (they may carry user-readable session names + tags). Logging limited to status code + session_id when present.
- **[style]** Async-native. No sync entry points. Consistent with `sse_client`.

## Out of scope

- **Bifrost binding** (Worldtree issue #160). `create_session` does not accept or send a `bifrost` field. Ratatoskr is not a Bifrost consumer; consumer-side tool injection is an advanced feature outside the dev TUI's purpose.
- **Ephemeral / Saga sessions.** Separate session class with TTL semantics; not needed for hands-on dev probing.
- **`GET /sessions/{id}` (single fetch), `PATCH /sessions/{id}` (mutation), `DELETE /sessions/{id}` (deletion).** Per design-brief §4 negative clauses; admin operations live outside Ratatoskr.
- **`GET /sessions/{id}/messages` (history pagination).** Deferred until the TUI needs scrollback replay; `--send` doesn't need history.
- **Transparent multi-page iteration.** `list_sessions` returns one page; caller threads `next_cursor` for the next call. Don't add an `iter_all_sessions()` until the TUI proves it needs that shape.
- **Server retry / backoff.** Caller's policy. The module does not retry on 5xx; it surfaces failure once and returns control.

---

```contract
FN create_session(client: httpx.AsyncClient, agent_id: str, *, end_user_id: str | None = None) -> SessionInfo
BRIEF: POST /sessions with {"agent_id": agent_id} (and {"end_user_id": end_user_id} when non-None) to create a new conversation session. Returns SessionInfo populated from the 201 response. Per issue #5: keyword-only `end_user_id` for per-end-user agents (lofn etc.); default-None preserves the pre-#5 baseline.
PRE: [PRE-001 hard] client is not None -- assert client is not None
PRE: [PRE-002 hard] agent_id is a non-empty string -- assert agent_id and isinstance(agent_id, str)
PRE: [PRE-003 hard, issue #5] end_user_id is None OR a non-empty string -- assert end_user_id is None or (isinstance(end_user_id, str) and end_user_id)
POST: [POST-001 side_effect] exactly one POST to /sessions was issued; body is {"agent_id": agent_id} when end_user_id is None, OR {"agent_id": agent_id, "end_user_id": end_user_id} when non-None (issue #5 INV-002: omitting the field when None is NOT the same as sending empty)
POST: [POST-002 return_value] returns SessionInfo with session_id, agent_id, created_at, last_active, metadata populated from response -- assert all 5 fields non-None
POST: [POST-003 return_value] returns SessionInfo where message_count == response["message_count"] (typically 0 for a fresh session) and list-only fields carry the create-origin fixed defaults per INV-001 -- assert info.message_count is not None and info.name is None and info.archived is False and info.tags == []
ERROR_ROUTING:
  HTTP 404 unknown_agent_id:
    local_handling: raise AgentNotFound(agent_id=agent_id)
    flow_control: abort
    state_recovery: none (caller passed an unknown agent_id; that's a user error)
  HTTP 422 validation_failed:
    local_handling: raise SessionApiFailed(status=422, body=resp.content[:1024])
    flow_control: abort
    state_recovery: none (typically client bug; surface for debugging. Issue #5: a `end_user_id_required` 422 indicates the agent requires --end-user-id; raw label is honest, hint translation deferred.)
  httpx.HTTPStatusError (other status):
    local_handling: raise SessionApiFailed(status=resp.status_code, body=resp.content[:1024])
    flow_control: abort
    state_recovery: none
STEPS:
  1. [setup, flexibility=prescriptive] Validate inputs per PRE-001, PRE-002, PRE-003
  2. [sequential, flexibility=prescriptive] Build body = {"agent_id": agent_id}; IF end_user_id is not None: body["end_user_id"] = end_user_id
  3. [sequential, flexibility=prescriptive] CALL client.post("/sessions", json=body)
     tool: { destructive: false, idempotent: false, read_only: false, open_world: false }
  4. [branch, flexibility=prescriptive] IF resp.status_code == 404: RAISE AgentNotFound
     ELIF resp.status_code != 201: RAISE SessionApiFailed
  5. [sequential] Parse resp.json() → body
  6. [cleanup] RETURN SessionInfo(
        session_id=body["session_id"],
        agent_id=body["agent_id"],
        created_at=body["created_at"],
        last_active=body["last_active"],
        metadata=body.get("metadata", {}),     # INV-001 defensive default
        message_count=body["message_count"],   # INV-001/POST-003: required, never defaulted
        name=None,                             # INV-001 fixed for create-origin
        archived=False,                        # INV-001 fixed for create-origin
        tags=[],                               # INV-001 fixed for create-origin
     )
TESTS:
  happy_create [happy,tracer]: mock returns 201 with full body → returns SessionInfo with all create-side fields populated; list-only fields are at create-origin defaults (name=None, archived=False, tags=[])
  happy_create_with_metadata [happy]: response includes metadata={"model": "glm5-turbo"} → SessionInfo.metadata == {"model": "glm5-turbo"}
  request_body_shape [trace]: outbound JSON body is exactly {"agent_id": <arg>} when end_user_id omitted — no Bifrost field, no extra keys
  unknown_agent_id [error]: mock returns 404 → raises AgentNotFound(agent_id="mimir")
  validation_failed [error]: mock returns 422 → raises SessionApiFailed(status=422); body truncated to ≤1024 bytes
  unexpected_status_truncates [error]: mock returns 500 with 5000-byte body → SessionApiFailed; .body is exactly the first 1024 bytes
  empty_agent_id [adversarial]: agent_id="" → AssertionError; no HTTP issued
  happy_create_with_end_user_id [happy, issue #5]: end_user_id="alice" → outbound JSON body == {"agent_id": "mimir", "end_user_id": "alice"} byte-for-byte; SessionInfo populated as today
  default_omits_end_user_id [trace, issue #5]: omit end_user_id kwarg → outbound JSON body == {"agent_id": "mimir"} (no end_user_id key); preserves the pre-#5 baseline
  empty_end_user_id [adversarial, issue #5]: end_user_id="" → AssertionError before HTTP (PRE-003)
```

```contract
FN list_sessions(client: httpx.AsyncClient, *, include_archived: bool = False, limit: int = 50, cursor: str | None = None) -> SessionPage
BRIEF: GET /sessions with cursor pagination. Returns one SessionPage. Caller threads next_cursor for subsequent pages.
PRE: [PRE-001 hard] client is not None -- assert client is not None
PRE: [PRE-002 hard] limit is in [1, 200] -- assert 1 <= limit <= 200 (INV-006: refuse out-of-range client-side; do not depend on server 422)
PRE: [PRE-003 hard] cursor is None or a non-empty string -- assert cursor is None or (isinstance(cursor, str) and cursor)
POST: [POST-001 side_effect] exactly one GET to /sessions was issued -- assert mock_router.calls.call_count == 1
POST: [POST-002 side_effect] query string carries `limit=<limit>` always; `include_archived=true` iff caller passed include_archived=True; `cursor=<cursor>` iff caller passed a cursor -- assert URL params match
POST: [POST-003 return_value] returns SessionPage(items=[SessionInfo, ...], next_cursor=str|None) per response -- assert isinstance(result.items, list) and (result.next_cursor is None or isinstance(result.next_cursor, str))
POST: [POST-004 return_value] each SessionInfo in items has list-side fields (name, archived, tags) populated and message_count=None per INV-002 -- assert all(info.message_count is None for info in result.items)
ERROR_ROUTING:
  HTTP 422 (cursor_invalid):
    local_handling: parse body for error_code; raise InvalidCursor(raw=cursor) if error_code == "cursor_invalid"; else raise SessionApiFailed
    flow_control: abort
    state_recovery: caller policy — restart from page 1 (cursor=None)
  HTTP 422 (other validation_failed):
    local_handling: raise SessionApiFailed(status=422, body=resp.content[:1024])
    flow_control: abort
    state_recovery: none (PRE-002/003 should have caught client-side issues; server-side 422 means spec mismatch)
  httpx.HTTPStatusError (other status):
    local_handling: raise SessionApiFailed(status=resp.status_code, body=resp.content[:1024])
    flow_control: abort
    state_recovery: none
STEPS:
  1. [setup, flexibility=prescriptive] Validate inputs per PRE-001..PRE-003
  2. [sequential, flexibility=prescriptive] Build params dict: {"limit": limit}; ADD "include_archived": "true" iff include_archived; ADD "cursor": cursor iff cursor is not None
  3. [sequential, flexibility=prescriptive] CALL client.get("/sessions", params=params)
     tool: { destructive: false, idempotent: true, read_only: true, open_world: false }
  4. [branch, flexibility=prescriptive] IF resp.status_code == 422:
       Parse body; IF body.get("error_code") == "cursor_invalid": RAISE InvalidCursor(raw=cursor)
       ELSE: RAISE SessionApiFailed(status=422, body=resp.content[:1024])
     ELIF resp.status_code != 200: RAISE SessionApiFailed
  5. [sequential] Parse resp.json() → body
  6. [loop] FOR EACH item in body["items"]: CONSTRUCT SessionInfo(
        session_id=item["session_id"],
        agent_id=item["agent_id"],
        created_at=item["created_at"],
        last_active=item["last_active"],
        metadata=item.get("metadata", {}),       # INV-002 defensive default
        message_count=None,                      # not in list response per spec
        name=item.get("name"),                   # INV-002: may be None
        archived=item.get("archived") or False,  # INV-002: absent/null/false → False (the `or` form is load-bearing — .get(k, default) does not fire default on explicit null)
        tags=item.get("tags") or [],             # INV-002: absent/null/[] → []
     )
  7. [cleanup] RETURN SessionPage(items=infos, next_cursor=body.get("next_cursor"))
TESTS:
  happy_first_page [happy,tracer]: GET /sessions, mock returns {items: [one full session shape], next_cursor: "v1.abc..."} → SessionPage(items=[1], next_cursor="v1.abc...")
  happy_last_page [happy]: mock returns {items: [...], next_cursor: null} → SessionPage with next_cursor=None
  empty_results [happy]: mock returns {items: [], next_cursor: null} → SessionPage([], None)
  include_archived_query [trace]: include_archived=True → URL has include_archived=true; default (include_archived=False) → URL has NO include_archived param at all (STEP 2 prescribes "ADD include_archived='true' iff include_archived" — the test asserts absence on default, not an explicit false)
  cursor_threaded [trace]: cursor="opaque-from-prev-page" → URL has cursor=opaque-from-prev-page
  limit_query [trace]: limit=10 → URL has limit=10
  invalid_cursor_server [error]: mock returns 422 with body {"error_code":"cursor_invalid","message":"..."} → raises InvalidCursor(raw=<the cursor passed in>)
  other_validation_failed [error]: mock returns 422 with body {"error_code":"validation_failed",...} → raises SessionApiFailed(status=422); body truncated
  unexpected_status_truncates [error]: mock returns 500 with 5000-byte body → SessionApiFailed; .body is exactly the first 1024 bytes
  limit_below_one [adversarial]: limit=0 → AssertionError; no HTTP issued
  limit_above_max [adversarial]: limit=300 → AssertionError; no HTTP issued
  empty_cursor [adversarial]: cursor="" → AssertionError; no HTTP issued
```

## Amendment 2026-06-30 — boot-time introspection reads (v1 coverage-audit: capabilities+me)

The v1 coverage-audit added two read-only server-introspection endpoints as
cheap debug primitives (surfaced via a new `ratatoskr --whoami` one-shot). Both
mirror `get_persona_state`: GET, 200 → parsed dict verbatim, any non-200 →
`SessionApiFailed`. The frozen OpenAPI types both responses as freeform objects,
so the wrappers return `dict[str, Any]` (not a typed dataclass).

```contract
FN get_me(client: httpx.AsyncClient) -> dict[str, Any]
BRIEF: GET /me — the authenticated principal's identity + key metadata (spec §GET /me). Boot-time whoami: verify the key without agent-config side effects. Returns parsed JSON verbatim; spec documents {user_id, scopes, tier, display_name?, key_id?, key_label?, ...} with optional fields OMITTED (not null). Read-only, rate-exempt, no audit emission.
PRE: [PRE-001 hard] client is not None -- assert client is not None
POST: [POST-001 return_value] on 200 returns resp.json() unmodified -- assert result == resp.json()
ERROR_ROUTING:
  HTTP non-200 (incl. 401 bad/absent key when auth enabled):
    local_handling: raise SessionApiFailed(status=resp.status_code, body=resp.content)
    flow_control: abort
    state_recovery: none (caller decides: bad key → re-key; degraded tier="unknown" is still a 200)
STEPS:
  1. [setup, prescriptive] assert client is not None
  2. [sequential, prescriptive] resp = await client.get("/me")
  3. [branch, prescriptive] IF resp.status_code == 200: RETURN resp.json(); ELSE RAISE SessionApiFailed
TESTS:
  happy_authenticated [happy,tracer]: 200 {user_id, scopes, tier, key_id} → dict returned verbatim
  anonymous_dev_mode: 200 {user_id:"anonymous", tier:"anonymous"} → dict; no key_* fields (omitted)
  401_raises [error]: 401 → SessionApiFailed(status=401)

FN get_capabilities(client: httpx.AsyncClient) -> dict[str, Any]
BRIEF: GET /capabilities — server capability discovery (spec §Ephemeral Templates). Returns {ephemeral_templates: {echo: {allowed_models, default_model, system_prompt_max_bytes}}}. Any authenticated caller may read it (no instantiate scope). Parsed dict verbatim; any non-200 → SessionApiFailed.
PRE: [PRE-001 hard] client is not None -- assert client is not None
POST: [POST-001 return_value] on 200 returns resp.json() unmodified -- assert result == resp.json()
ERROR_ROUTING:
  HTTP non-200:
    local_handling: raise SessionApiFailed(status=resp.status_code, body=resp.content)
    flow_control: abort
    state_recovery: none
STEPS:
  1. [setup, prescriptive] assert client is not None
  2. [sequential, prescriptive] resp = await client.get("/capabilities")
  3. [branch, prescriptive] IF resp.status_code == 200: RETURN resp.json(); ELSE RAISE SessionApiFailed
TESTS:
  happy [happy]: 200 {ephemeral_templates:{echo:{...}}} → dict returned verbatim
  non_200_raises [error]: 500 → SessionApiFailed(status=500)
```

## Amendment 2026-07-01 — session tool introspection (v1 coverage-audit)

Owner-scoped tool-inventory read (spec #183, `GET /sessions/{id}/tools`),
surfaced in the TUI Tools pane on session-attach. Same shape as the other
introspection wrappers: GET, 200 → parsed dict verbatim, non-200 →
`SessionApiFailed`. Reachable with the consumer key (no admin scope), unlike the
admin variant `GET /admin/sessions/{id}/tools`.

```contract
FN get_session_tools(client: httpx.AsyncClient, session_id: str) -> dict[str, Any]
BRIEF: GET /sessions/{session_id}/tools — owner-scoped merged tool inventory (spec #183) the LLM saw at turn-fire: {agent_id, builtin_tools: [...], bifrost_tools: [{name, description, parameters}, ...]}. Owner gate (ctx.user_id == session.user_id); cross-owner → 404 session_not_found (existence-hiding), revoked → 401 auth_revoked. Parsed dict verbatim; any non-200 → SessionApiFailed.
PRE: [PRE-001 hard] client is not None -- assert client is not None
PRE: [PRE-002 hard] session_id is non-empty str -- assert session_id and isinstance(session_id, str)
POST: [POST-001 return_value] on 200 returns resp.json() unmodified -- assert result == resp.json()
ERROR_ROUTING:
  HTTP non-200 (incl. 404 session_not_found cross-owner/unknown, 401 auth_revoked):
    local_handling: raise SessionApiFailed(status=resp.status_code, body=resp.content)
    flow_control: abort
    state_recovery: none
STEPS:
  1. [setup, prescriptive] assert PRE-001, PRE-002
  2. [sequential, prescriptive] resp = await client.get(f"/sessions/{session_id}/tools")
  3. [branch, prescriptive] IF resp.status_code == 200: RETURN resp.json(); ELSE RAISE SessionApiFailed
TESTS:
  happy [happy,tracer]: 200 {agent_id, builtin_tools:[], bifrost_tools:[{name,...}]} → dict verbatim
  cross_owner_404 [error]: 404 session_not_found → SessionApiFailed(status=404)
  empty_session_id [adversarial]: "" → AssertionError; no HTTP issued
```

## Amendment 2026-07-01 — admin BifrostState read (v1 coverage-audit)

Admin-scoped Bifrost dispatch-state read (spec #176, `GET /admin/sessions/{id}/bifrost`),
surfaced in the TUI BifrostState pane on session-attach. The first admin-key
consumer in ratatoskr: requires the `admin.sessions.read` scope, so the request
OVERRIDES the Authorization header with the caller-supplied `admin_key` (distinct
from the client's default consumer key). Same result-shape convention as the
other introspection wrappers: 200 → parsed dict verbatim, non-200 → `SessionApiFailed`.

```contract
FN get_session_bifrost(client: httpx.AsyncClient, session_id: str, *, admin_key: str) -> dict[str, Any]
BRIEF: GET /admin/sessions/{session_id}/bifrost — admin-scoped live Bifrost binding (spec #176): {endpoint_url, consumer_id, connected, capabilities_granted, tools:[{name, description}]}. Requires admin.sessions.read; the request sets Authorization: Bearer <admin_key> (override), NOT the client's default consumer bearer. Parsed dict verbatim; any non-200 → SessionApiFailed — notably 403 auth_scope_denied and 404 session_not_bifrost_bound.
PRE: [PRE-001 hard] client is not None -- assert client is not None
PRE: [PRE-002 hard] session_id is non-empty str -- assert session_id and isinstance(session_id, str)
PRE: [PRE-003 hard] admin_key is non-empty str -- assert admin_key and isinstance(admin_key, str)
POST: [POST-001 return_value] on 200 returns resp.json() unmodified -- assert result == resp.json()
POST: [POST-002 state_change] the outbound request Authorization header == f"Bearer {admin_key}" (override) -- assert request.headers["Authorization"] == "Bearer " + admin_key
ERROR_ROUTING:
  HTTP non-200 (incl. 403 auth_scope_denied, 404 session_not_found / session_not_bifrost_bound):
    local_handling: raise SessionApiFailed(status=resp.status_code, body=resp.content)
    flow_control: abort
    state_recovery: none (caller decides: 403 → key lacks scope; 404 not-bound → benign unbound session)
STEPS:
  1. [setup, prescriptive] assert PRE-001..PRE-003
  2. [sequential, prescriptive] resp = await client.get(f"/admin/sessions/{session_id}/bifrost", headers={"Authorization": f"Bearer {admin_key}"})
  3. [branch, prescriptive] IF resp.status_code == 200: RETURN resp.json(); ELSE RAISE SessionApiFailed
TESTS:
  happy_uses_admin_bearer [happy,tracer]: 200 {endpoint_url, connected, capabilities_granted, tools} → dict verbatim; request Authorization == "Bearer <admin_key>" (override)
  scope_denied_403 [error]: 403 → SessionApiFailed(status=403)
  not_bound_404 [error]: 404 session_not_bifrost_bound → SessionApiFailed(status=404)
  empty_admin_key [adversarial]: admin_key="" → AssertionError; no HTTP issued
```

## Amendment 2026-07-01 — Tier-2: transient characters + persona-state write (v1 coverage-audit)

The last in-scope client I/O points. Transient-character CRUD (#161) surfaced
via a `--characters` one-shot lifecycle probe; persona-state write surfaced via
`--set-persona-pad "p,a,d"` (requires `--session`). All mirror the existing
wrappers: parsed dict verbatim (or None on 204), any off-status → SessionApiFailed.
**Note:** `set_persona_state`'s request body is FREEFORM — the frozen OpenAPI 2.2.0
declares no request schema and the prose spec documents only the GET counterpart,
so the caller supplies the snapshot shape (`--set-persona-pad` sends `{pad:[…]}`).

```contract
FN list_character_models(client) -> dict[str, Any]
BRIEF: GET /models/available-for-characters (character.read). Returns {items:[{name, description, thinking}]}. Non-200 → SessionApiFailed.
PRE: [PRE-001 hard] client is not None
POST: [POST-001 return_value] on 200 returns resp.json() unmodified
STEPS:
  1. [sequential, prescriptive] resp = await client.get("/models/available-for-characters"); IF 200 RETURN resp.json(); ELSE RAISE SessionApiFailed
TESTS:
  list_models [happy,tracer]: 200 {items:[{name:"fast"}]} → dict verbatim

FN create_character(client, character: dict, *, state: dict | None = None) -> dict[str, Any]
BRIEF: POST /characters (character.write). Body {character, state}. Returns 201 {character_id, ttl_expires_at}; non-201 → SessionApiFailed.
PRE: [PRE-001 hard] client is not None; [PRE-002 hard] character is a non-empty dict
POST: [POST-001 return_value] on 201 returns resp.json(); [POST-002 side_effect] outbound body == {"character": <arg>, "state": <state|null>}
STEPS:
  1. [sequential, prescriptive] resp = await client.post("/characters", json={"character": character, "state": state}); IF 201 RETURN resp.json(); ELSE RAISE SessionApiFailed
TESTS:
  create [happy]: 201 → {character_id}; body is {character, state:null}
  create_403 [error]: 403 auth_scope_denied → SessionApiFailed(403)

FN get_character_state(client, character_id: str) -> dict[str, Any]
BRIEF: GET /characters/{id}/state (character.read). Live PAD/emotions snapshot; refreshes TTL. Non-200 → SessionApiFailed.
PRE: [PRE-001 hard] client not None; [PRE-002 hard] character_id non-empty str
POST: [POST-001 return_value] on 200 returns resp.json()
STEPS:
  1. [sequential, prescriptive] resp = await client.get(f"/characters/{character_id}/state"); IF 200 RETURN resp.json(); ELSE RAISE SessionApiFailed
TESTS:
  get_state [happy]: 200 {pad:[...]} → dict verbatim

FN delete_character(client, character_id: str) -> None
BRIEF: DELETE /characters/{id} (character.write). 200/204 → None; other → SessionApiFailed.
PRE: [PRE-001 hard] client not None; [PRE-002 hard] character_id non-empty str
POST: [POST-001 return_value] on 200/204 returns None
STEPS:
  1. [sequential, prescriptive] resp = await client.delete(f"/characters/{character_id}"); IF status in (200,204) RETURN None; ELSE RAISE SessionApiFailed
TESTS:
  delete [happy]: 204 → None

FN set_persona_state(client, session_id: str, snapshot: dict) -> None
BRIEF: POST /sessions/{session_id}/persona_state — set a session's persona state (affect injection). Request body is the FREEFORM snapshot (caller-supplied; unpinned in the frozen surface). 204 → None; other → SessionApiFailed.
PRE: [PRE-001 hard] client not None; [PRE-002 hard] session_id non-empty str; [PRE-003 hard] snapshot is a dict
POST: [POST-001 return_value] on 204 returns None; [POST-002 side_effect] outbound body == snapshot verbatim
STEPS:
  1. [sequential, prescriptive] resp = await client.post(f"/sessions/{session_id}/persona_state", json=snapshot); IF 204 RETURN None; ELSE RAISE SessionApiFailed
TESTS:
  happy [happy]: 204 → None; body == {"pad":[...]} verbatim
  non_204 [error]: 422 → SessionApiFailed(422)
```