Nothing to try yet Notable
No documentation found
Detailed prompt-cache-break diffing telemetry exists but is sampled at zero by default.
New telemetry can capture a detailed structural snapshot of the first request message, including block kinds, lengths, hashes, named sections like preamble, claudeMd, and workerToolsContext, and worker tool/MCP-server counts, diffing it on a cache break to report changed, added, and removed sections and blocks. This collection is sampled via the gate tengu_iridescent_gem, which defaults to a sample rate of 0, so none of this data is captured unless that rate is raised remotely.
Names in the bundletengu_iridescent_gem
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this build
New in this build: tengu_iridescent_gem