Individual skill
context-sweet-spot
Investigates the context economics of your own coding-agent sessions in LangWatch. Reads real sessions to find where carrying a fat context stops paying for itself, measured in cache rebuilds, compactions and cost per turn, and delivers a report with the context size your sessions should stay under, with example sessions behind every claim. Use when coding-agent sessions feel expensive or degrade as they grow.
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# Find the Context Size Where Your Sessions Stop Paying
This skill answers one question with the user's own data: at what context size do their coding-agent sessions become a bad deal? Long context is not free even when it fits the window: every cache rebuild re-bills the whole context at write rates, compactions burn turns, and models degrade before their window ends. The sweet spot is where those costs start outrunning the value of the carried context. It is read-only on the platform. Locally it writes a trace export while it works and deletes it again, and leaves one report file behind.
## Step 1: Set up the LangWatch CLI
Use the `langwatch` CLI for everything: documentation (`langwatch docs ...`, `langwatch scenario-docs ...`) and platform operations (prompts, scenarios, evaluators, datasets, monitors, traces, analytics). Install it once with `npm install -g langwatch`, then run the `langwatch` binary directly; an unpinned `npx langwatch` re-resolves the package from the registry on every run.
Coding-agent sessions live in the user's personal LangWatch workspace by default. On a laptop `langwatch login --device` signs this machine in. A project key in `LANGWATCH_API_KEY` stands in for that login only for its own project: it refuses `--project` for any other, so reaching a team project still needs `langwatch login --device`. Add `--project <slug>` on the read commands when the sessions live in a team project instead.
## Step 2: Collect the Sessions
Pick one window and use it everywhere, because `trace export` defaults to the last 7 days. Compute a start and an end date once (30 days back to now is a good default) and pass both:
