Keep the measurement inspectable.

Know which ledger you mean

The context ledger tracks retained context pressure and supports eviction/pruning. The savings evidence records representation changes and associated measurement information.

They are related to different questions. Removing a context entry is not an accounting adjustment to a provider bill.

Inspect the local report

lean-ctx savings --format json

Read the fields and measurement scope in your installed runtime. A recorded token estimate is not a measured provider charge.

Verify what can be verified

Integrity checks establish properties of the retained evidence, such as consistency or tamper detection under the relevant format. They do not establish that a baseline was fair, that no context was missed or that a task succeeded.

Keep the original source and evaluation conditions alongside any report you intend to share.

Compare complete tasks

Include all relevant reads, recovery calls, retries and provider usage. Declare the tokenizer and any pricing model. Do not add read-side and request-side reductions without checking for overlap.

Use observability for an evidence workflow and token measurements for interpreting the numbers.

Sources & versions3 references · Reviewed 17 Sept 2026

• 16-signed-savings-ledger.mddocs/reference/16-signed-savings-ledger.mdGitHub
• ledger_cmd.rsrust/src/cli/ledger_cmd.rsGitHub
• 11-analytics-and-insights.mddocs/reference/11-analytics-and-insights.mdReviewed checkout

Core checkout

0ce2207ee4

Installed runtime

3.10.2

SDK release

1.1.0

Separate baselines for source, CLI/configuration and SDK contracts. Review does not certify every platform or integration.

Versions & compatibility