generated: '2026-08-05'
method: searched
source:
- https://syllable.ai/pricing
- https://github.com/asksyllable/syllable-cli
- openapi/syllable-sdk-openapi-original.yml
summary: >-
  Syllable has no separate sandbox host and publishes no magic test values (no test card
  numbers, test phone-number ranges, or test-mode key prefixes). Testing happens against
  the real platform, on a free-trial account with a limited minute allowance, using the
  auto-generated per-agent test channel and the CLI's dry-run mode. Multiple named
  environments per org are supported by the CLI config, but only "prod" is built in — any
  other environment (for example a staging base URL) comes from a customer-specific
  provisioning step, not from a public sandbox.
test_account:
  free_trial: true
  signup: https://syllable.cloud/sign-up
  credit_card_required: false
  allowance: limited-minute allowance, max 3 minutes per call
  credit_expiry: credits remain active as long as the account is open
  paid_entry: metered pay-as-you-go, $150 initial prepayment with $100 auto-recharge below $50
test_vs_live_separation:
  key_prefixes: null
  modes: null
  note: >-
    No test-mode/live-mode key distinction is documented. One API token per organization;
    isolation is achieved by using a separate organization or sub-organization rather than
    a test key. The CLI config supports several orgs and several environments per org.
in_platform_testing:
- name: Auto-generated agent test channel
  description: >-
    A test channel is auto-generated for every agent so it can be exercised before going
    live. Documented in the syllable-cli README's platform overview.
- name: Agent test message endpoint
  description: Send a message to an agent under test.
  operation_id: send_test_message
  tag: agents.test
- name: Voice testing
  description: >-
    Voice testing capabilities in the console, expanded in release v26.7.28; a Responsive
    Dialogue testing toggle for voice-mode agents shipped in v26.6.27.
  source: https://syllable.ai/release-notes/
- name: Session debug
  description: Session debug operations for inspecting a completed session.
  tag: session_debug
cli_simulation:
- flag: --dry-run
  description: >-
    Prints the exact request that would be sent (method, url, body) and, since CLI v2.0.0,
    any missing_required_fields — without sending it.
- flag: --debug
  description: Prints the full HTTP request/response to stderr with credentials redacted.
- flag: --output json
  description: Returns the full raw API response and machine-readable errors for assertions.
environments:
  builtin:
  - prod
  configurable: true
  config_file: ~/.syllable/config.yaml
  note: >-
    Non-prod environments are declared per customer in the CLI config with their own
    base_url and API key; they are provisioned via `syllable setup`, not published.
magic_values:
  test_cards: null
  test_phone_numbers: null
  test_identifiers: null
  note: >-
    None published. Deliberately recorded as absent rather than invented.
x-evidence:
- url: https://syllable.ai/pricing
  http_status: 200
- url: https://syllable.cloud/sign-up
  http_status: 200
- url: https://api.github.com/repos/asksyllable/syllable-cli
  http_status: 200