Update a cost model
Changes the name, the overrides, the status, and for a custom cost model the kind, declared units and dimensions. Sending overrides replaces the whole list. Provider, model, source and catalog model can’t change. Archiving a cost model stops new rate cards and price rules from using it; costs already recorded keep the version that priced them. In live mode an agent’s write is refused with 403 and proposal_required: put the same object in a config proposal. People change live configuration in the dashboard.
Authentication
A secret key (rl_sk_test_..., rl_sk_live_...) or a restricted key with limited scopes (rl_rk_test_..., rl_rk_live_...). A restricted key can carry agent: true and an expires_at, and is what a coding agent should hold. Keys end in a checksum so secret scanners can recognize them. People create, roll and revoke keys in the dashboard; GET /v1/api_keys lists them, masked.
Path parameters
The cost model ID (cm_...) or its key.
Headers
Send true to see what the write would do without doing it. The response is the normal body with dry_run: true, changes (path, before, after), warnings and errors added, and nothing is stored. Validation runs as it would for a real write. The request is kept in request logs, tagged Dry run. When the same change is then made for real, its audit event has dry_run_preceded: true.
Request
What the model produces. Open: new values may be added.
Response
Where a cost model’s rates come from. catalog: the provider price catalog that Runledger maintains, with your overrides on top. custom: rate cards you enter yourself.
For source: catalog. The catalog model this cost model follows (catm_...).
What the model produces. Open: new values may be added.
The rate card in force now (rc_...). Left out until one is active.
Who made a change. Runledger fills it in from the credential, so a client can’t claim to be someone else: an API key always acts as itself, the dashboard calls the API as the signed-in person, and the MCP server passes the client’s name and the person it acts for. A request that sends a Runledger-Actor header is refused with 400 parameter_unknown.