Providers key prompt caches per model, so a mid-session /model switch makes
the next reply re-read the entire conversation at full input price. deepagents
gates user-initiated switches behind a confirmation once the active thread
exceeds a configurable token threshold; this ports the same protection into
Hermes' unified selection-guard registry so it renders on every surface at
once (CLI/TUI picker, gateway /model, Telegram/Discord pickers, dashboard).
- hermes_cli/model_selection_guards.py: new context_cache guard +
SelectionContext carrier + selection_context_for_agent() helper;
registry threads live-session facts to guards (6-arg signature with a
TypeError fallback for externally patched 5-arg guards).
- config: model.switch_context_confirm_tokens (default 100000, 0 disables).
- cli.py / gateway/slash_commands.py / tui_gateway/server.py: thread the
live agent's measured context into the guard call.
- docs: configuring-models.md mid-session switch section.
- tests: tests/hermes_cli/test_context_cache_switch_guard.py (13 cases).
The Desktop composer got a reasoning-effort pill this morning; every other place a
model is picked still left the effort to a separate command (`/reasoning`) or a
hand edit of config.yaml. `hermes model` had one effort step for Copilot only, and
its auxiliary-model menu had none at all even though every aux block already reads
`auxiliary.<task>.reasoning_effort`.
One request now carries a model pick AND its effort on every surface:
- `hermes_cli/model_switch.py`: the single `/model` parser accepts `--reasoning
<level>` (validated against `parse_reasoning_effort`; unknown level ->
`MODEL_SWITCH_ERR_BAD_REASONING`; Unicode-dash normalized like the other flags).
`ModelSwitchRequest.reasoning_effort` rides with the pick.
- Classic CLI (`cli_model_switch_mixin`, `cli_tui_mixin`): `/model X --reasoning
high` applies the effort AFTER the agent swap (`switch_model` re-resolves
`reasoning_config` from config.yaml, so an earlier write is clobbered) with the
pick's scope (session; config on `--global`; `--once` snapshots and restores it).
The `/model` picker gains a third stage, "Reasoning effort for <model>", built
from `VALID_REASONING_EFFORTS` + none + "Keep current effort"; hidden when the
inventory capability map says the route has no reasoning control.
- TUI gateway (`tui_gateway/model_switch.py`, serves Ink TUI + Desktop):
`config.set model "X --reasoning high"` applies after the swap; session pin
(`create_reasoning_override`) by default, `agent.reasoning_effort` on --global,
one-turn restore carries `reasoning_config`; re-emits `session_info` so the
status bar shows the new effort.
- Ink TUI `ModelPicker`: step 3/3 (same rows, same capability gate) emitting
`<model> --provider <slug> --reasoning <level> <scope>`; the new-session draft
label strips the flag like `--provider`.
- Messaging gateway `/model`: `--reasoning` goes through the existing
`_apply_reasoning_selection` (the `/reasoning` applier) with the pick's scope.
- `hermes model`: one shared post-pick effort step for the MAIN model (replaces
the Copilot-only inline prompt; Copilot keeps its per-model level set via
`github_model_reasoning_efforts`, other routes get the ladder, catalog
`supports_reasoning=False` skips it) plus a "Reasoning effort for the current
model..." row. The auxiliary menu's provider->model and custom-endpoint flows end
with the same step (+ "Provider default"), stored as
`auxiliary.<task>.reasoning_effort` / `delegation.reasoning_effort`, shown in
the task list ("openrouter · model · high"), cleared by "Reset all to auto";
tasks whose block omits the key by design (MoA slots, memory_query_rewrite) skip
it.
Live (temp HERMES_HOME, stub key, no model call):
- `hermes model` -> aux -> Vision -> OpenRouter -> model: before ends at
"Vision: openrouter · <m>", no key written; after adds "Select reasoning effort"
and saves `reasoning_effort: high`.
- `hermes model` -> DeepSeek -> model: before no effort step; after the step
writes `agent.reasoning_effort: xhigh`.
- tui_gateway stdio: `config.set model "... --reasoning high --session"` before
errors "Model names cannot contain spaces"; after switches and `config.get
reasoning` returns high; bad level -> the canonical error text.
- classic CLI `process_command`: before the same spaces error; after "Reasoning
effort: high" under the switch summary, `--global` writes config.
- `hermes --tui` PTY: /model -> step 1/3 -> 2/3 -> 3/3 -> high; transcript
"reasoning: high", status bar "fable 5.1 high".
One `/model --global` produced four config.yaml shapes. CLI wrote
default/provider/base_url/api_mode and cleared the context pin on a route
change; the gateway rewrote the whole `model:` block (whole-file save_config)
and only set api_mode for `custom`; the TUI wrote three keys and never
touched api_mode, so a switch off an Anthropic-wire endpoint left a stale
`api_mode: anthropic_messages` in config; the dashboard main slot had its own
switched-provider logic, wrote `base_url: ""` and always dropped
context_length. ACP `session/set_model` and `POST /api/model/set` accepted
any model string (parse_model_input + detect_provider_for_model) so a model
no catalog knows, or a provider with no credentials, was handed to the
session / persisted and only failed at inference time.
Canonical: `hermes_cli.model_switch.model_selection_config_updates` (the
shape) + `persist_model_selection(result, config_path=None)` (targeted
per-key `atomic_roundtrip_yaml_update` writes, so sibling
`model_slots`/`model_fallback` keys survive; explicit path for the
multiplexed gateway's profile config) + `apply_model_selection` (same shape
applied to an in-memory `model:` dict for callers that save a whole
document). `atomic_roundtrip_yaml_update(value=None)` now REMOVES the key
instead of writing `key: null`, so per-key and whole-document writers land
the same file. Shape = CLI/gateway semantics: default, provider, base_url
(cleared when the target has none), api_mode (cleared when unresolved),
context_length cleared only when `should_clear_context_pin` says the route
identity changed, inline api_key/api cleared for non-custom targets.
Sites -> canonical:
hermes_cli/cli_model_switch_mixin.py::_persist_global_switch -> deleted; _commit_model_switch calls persist_model_selection
hermes_cli/cli_model_switch_mixin.py::_clear_persisted_context_for_model_switch -> deleted (folded into the shape)
gateway/slash_commands_model.py::_persist_model_switch_to_config -> to_thread forwarder: persist_model_selection(result, ctx.config_path)
tui_gateway/model_switch.py::_persist_model_switch -> deleted; _apply_model_switch calls persist_model_selection
hermes_cli/web_server_config.py::_apply_main_model_assignment -> apply_model_selection(result) (+ explicit custom api_key)
hermes_cli/web_server_config.py::_validated_main_model_selection -> NEW: switch_model(--provider) gate; rejection -> HTTP 400
hermes_cli/web_routers/{models,profiles,config_env}.py main-slot paths -> through _validated_main_model_selection
acp_adapter/server.py::_resolve_model_selection -> deleted; _switch_model calls switch_model (provider:model -> --provider), rejection -> ValueError
Behavior changes: TUI --global now writes/clears model.api_mode and clears a
route-changed context pin; gateway --global no longer rewrites the whole
model block (sibling keys survive) and clears api_mode for every target;
dashboard main slot / profile-create model / custom-endpoint activate now
reject unknown/uncredentialed/unlisted models (HTTP 400) and persist the
resolved base_url/api_mode instead of `base_url: ""`; ACP rejects the same
(ValueError surfaced by the command/protocol handler). Gateway persist runs
on a worker thread against the routed profile's config_path (multiplex-safe).
Cleared keys are removed from config.yaml rather than left as `null`. ACP
still never persists.
Kept `_normalize_main_model_assignment`: switch_model rejects a vendor name
posing as a provider (`moonshotai` -> "Unknown provider"), so the
vendor->aggregator repair is not a duplicate; E2E verified both branches.
No config migration: readers already coalesce `base_url: ""` to absent
(`_config_base_url_for_provider`) and gate api_mode on provider match
(`_provider_supports_explicit_api_mode`), so no stale-shape reader bug.
Tests: tests/hermes_cli/test_model_persist_one_shape.py (four surfaces land
one block; same-route re-pick keeps the pin), tests/acp_adapter/
test_acp_dashboard_model_switch_validation.py (rejection + explicit
provider prefix). Replaces test_acp_set_model_explicit_provider.py and the
two TUI-only persist tests; tests that intercepted the old per-surface seams
(`cli.save_config_value`, `load_config_readonly`, `tui_gateway.server.
_persist_model_switch`) now intercept the canonical seam. Each fix
sabotage-verified red.
_sync_bot_capabilities (Bot Chat capability refresh, run at every turn start) and
_reset_session_agent (/new, tools.set) swap a fresh AIAgent into a LIVE session but
called _make_agent with neither the session's state.db handle nor its HERMES_HOME.
_make_agent resolves prompt/skills/toolsets through get_hermes_home() and defaults
session_db to the process-wide LAUNCH _get_db() handle, so a named-profile session
silently migrated onto the launch profile: every later turn appended to
~/.hermes/state.db under the same session id while the desktop replayed
profiles/<name>/state.db and showed a stale transcript.
Route both rebuilds through _rebuild_session_agent, which binds the session's
profile scopes and inherits the outgoing agent's handle (same session, same file)
so no second refcount is taken and teardown still releases it exactly once.
No runtime consumer read the proxy (terminal_tool/environments call is_interrupted()/set_interrupt()
directly); its only users were tests patching tools.interrupt._interrupt_event, which had no effect on
the code under test. tools/terminal_tool.py's own re-export of the name is owned by another worker.
For each issue anchor present in BASE 63279301bc non-test .py and absent on HEAD, the BASE comment/docstring block was re-attached at the HEAD location of the code it explained (matched by the distinctive code line / enclosing def). Sentences already covered by an existing HEAD comment were deduped; the issue number always survives. Insert-only: no code lines changed.
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