> ## Documentation Index
> Fetch the complete documentation index at: https://docs.app.useharmonia.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Models, cost, and evaluation

> Native Bedrock role policies, explicit deployment pricing, reservations, and evidence requirements.

Harmonia chooses a model for each bounded cognitive task. The deterministic coordinator selects the task; a model cannot select its own authority or bypass a stage prerequisite.

## Role policy

| Registered task family                  | Default model      | Evaluation focus                                                    |
| --------------------------------------- | ------------------ | ------------------------------------------------------------------- |
| Intent routing and context assembly     | Claude Haiku 4.5   | Small strict contracts and faithful operator intent                 |
| Nimi analysis                           | Amazon Nova 2 Lite | Authoritative source references and quote/time grounding            |
| Ryan strategy and Temi planning         | Claude Sonnet 4.6  | Evidence-linked strategy and approved-strategy fidelity             |
| Noni writing/production and Dara review | Claude Sonnet 4.6  | Complete output coverage, grounded content and issue-bound revision |
| Maya presentation                       | Claude Haiku 4.5   | Bounded component and entity references                             |
| Nova liaison and contextual answers     | Claude Haiku 4.5   | Scoped read-only answers and explicit missing evidence              |
| Resident Dream synthesis                | Claude Sonnet 4.6  | Sanitized verified observations and bounded experiment proposals    |

Exact defaults are `us.anthropic.claude-haiku-4-5-20251001-v1:0`, `us.amazon.nova-2-lite-v1:0`, and `us.anthropic.claude-sonnet-4-6`. `agent/harmonia_agent/role_models.py` defines per-role sampling and token limits. Configured targets fail visibly when unavailable; no provider fallback exists.

## Reservation and usage lifecycle

The host estimates the operation's maximum cost, reserves its budget atomically, calls the provider, and records usage or an unresolved outcome. Stable operation identities connect reservations, model usage, execution receipts and verification. A retry may reuse durable accounting but does not automatically authorize another provider call. Unknown external outcomes require reconciliation.

Text pricing comes from `BEDROCK_TEXT_PRICING_JSON`, keyed by exact model ID with positive `input` and `output` USD-per-million-token rates. The version is `aws-configured-2026-09-10`. Missing prices fail admission; they are not zero-cost operations. Operators must supply rates applicable to their model, region and account. Configured estimates are not a claim about actual billed charges.

| Provider operation         | Admission input                                                                |
| -------------------------- | ------------------------------------------------------------------------------ |
| Amazon Transcribe          | `TRANSCRIBE_COST_PER_SECOND_USD`, including the host's minimum billed duration |
| Nova Canvas                | `IMAGE_MAX_COST_USD` ceiling                                                   |
| Nova Reel                  | `NOVA_REEL_COST_PER_SECOND_USD` and approved duration                          |
| ElevenLabs Music           | `ELEVENLABS_MUSIC_COST_PER_SECOND_USD` and approved duration                   |
| Direct production planning | `PRODUCTION_PLANNER_MAX_COST_USD` plus text prices                             |
| Dream synthesis            | `DREAM_MAX_COST_USD` plus text prices and resident policy                      |

`HARMONIA_ALLOW_PAID_AWS` defaults false. Media generation additionally requires `GENERATIVE_MEDIA_ENABLED`; music needs a server-side ElevenLabs key. Neither enabling flag proves provider readiness or grants approval for an output operation.

## Evaluation and evidence

Local tests exercise typed output, tool admission before dispatch, source lineage, cost accounting, claim recovery and independent byte verification. Test doubles isolate transport contracts; they are not authenticated provider evidence. A build proves compilation, not model quality.

A candidate model must be evaluated against the same trusted inputs and role constraints, with exact model identity, request policy, usage, latency and retained output evidence. Grounding and authority failures disqualify a result even when the prose is persuasive. No quality, latency or cost ranking is established for this AWS edition until a real authorized evaluation is captured.

Authenticated Bedrock, AgentCore, Transcribe, generated-media and billing reconciliation remain pending-live. See [Runtime inventory](/reference/agent-runtime-inventory), [Evaluation](/evaluation) and [Configuration](/configuration).