/**
 * Reads token usage out of Hermes Agent's SQLite state store.
 *
 * Hermes Agent is Nous Research's official CLI agent (github.com/NousResearch/
 * hermes-agent), a Python program installed from its own install script — not
 * an npm package. An earlier note in this folder said the opposite ("no
 * official CLI, only an unofficial npm bridge"); it had searched npm for a
 * product that is not distributed there, and is retracted here.
 *
 * Store: `$HERMES_HOME/state.db`, defaulting to `~/.hermes/state.db`, plus one
 * `state.db` per profile under `profiles/<name>/`. SQLite, `schema_version`
 * table (26 when this was written; `PRAGMA user_version` stays 0, so it is
 * not the version to read). Confirmed on a real store produced by running the
 * CLI itself, not inferred from documentation.
 *
 * Two tables carry usage, and they are NOT additive:
 *
 *   sessions            one row per session, with cumulative token columns
 *                       for the PRIMARY task only.
 *   session_model_usage one row per (session, model, billing, task), each
 *                       with its own `api_call_count`, token columns and cost.
 *
 * Measured on the real store: a one-prompt session held a `sessions` row of
 * 10,568 input / 1 output / 1 call, and TWO usage rows — the primary task
 * (`task = ''`, identical numbers) and a `title_generation` task of 248 / 8 /
 * 1 call that the `sessions` aggregate does not include. The usage rows are
 * therefore the complete record of what Hermes actually sent to a provider,
 * and this reader sums them. The `sessions` aggregate is read only for a
 * session that has no usage rows at all (a store older than the migration
 * that introduced the table), and never in addition to them. A usage table
 * that exists but lacks a required column is a changed schema, and is reported
 * rather than read around.
 *
 * Cost: Hermes records `estimated_cost_usd` with a `cost_status` of
 * `estimated`, from its own pricing snapshot. That is a modeled figure and is
 * reported as such. `actual_cost_usd` is `NOT NULL DEFAULT 0` on usage rows,
 * so a zero there is a schema default, not evidence of a free call — it is
 * used only when `cost_status` explicitly says the figure is actual. A row
 * with no trustworthy cost is counted as unpriced and its model named.
 *
 * Cache and reasoning columns are reported as stored. Every real sample so far
 * has them at zero, so whether `cache_read_tokens` is a subset of
 * `input_tokens` (OpenAI convention) or disjoint from it (Anthropic
 * convention) has not been measured, and no subtraction or folding is applied
 * until it has. Reasoning tokens are not added to output for the same reason.
 *
 * The time window is a snapshot filter, not an attribution: every row is a
 * cumulative counter, so a session that spans the cutoff is either included
 * whole or excluded whole, keyed on its last activity. Timestamps are epoch
 * SECONDS stored as REAL.
 */
import type { LocalUsageReader } from "../types/index.js";
export declare function createHermesReader(): Promise<LocalUsageReader>;