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ccusage-adapter-grok

The Grok Build CLI adapter: it turns session updates.jsonl files under ~/.grok into the usage entries the reports render.

Owns

loader.rs — reading sessions, progress, global dedupe, has_data
parser.rs — turn_completed admission, token split, pricing candidates
paths.rs — root resolution and sessions/**/updates.jsonl discovery
report.rs — daily / monthly / session summary shapes

Anything that is not specific to this source belongs in ccusage-core or ccusage-adapter-common instead.

Data source

Only completed turns:

$GROK_HOME/   # or ~/.grok
└── sessions/
    └── <url-encoded-cwd>/
        └── <session-uuid>/
            ├── updates.jsonl  # PRIMARY (turn_completed + usage)
            └── summary.json   # optional metadata

Runtime root priority: a non-empty GROK_HOME → ~/.grok. Path discovery stays inside the adapter, matching Grok Build CLI's official environment variable and default home.

In-progress turns are not counted until turn_completed is written. A session killed mid-turn never gets that row, so its usage is invisible here even though logs/unified.jsonl recorded the underlying requests. That log is not used as a source: it carries no per-request model id, so its tokens cannot be priced or attributed.

Token mapping

Grok records OpenAI-style usage where inputTokens includes cache:

Grok field	ccusage field	Rule
`inputTokens − cachedReadTokens`	`input_tokens`	cache clamped ≤ input
`cachedReadTokens`	`cache_read_input_tokens`
`outputTokens`	`output_tokens`	as recorded
`reasoningTokens`	dropped	already inside `outputTokens`; counting it again would inflate the total
`cacheCreationTokens`	`cache_creation_input_tokens`	carved out of the uncached remainder
`costUsdTicks`	`cost_usd`	fixed-point USD, one tick is 1e-10 USD

costUsdTicks is the invoice cost, so display and the default auto report what Grok billed. calculate, and auto for turns that recorded no ticks, fall back to token × LiteLLM pricing. That fallback only approximates the invoice: a turn_completed row aggregates several API requests, so it cannot reproduce Grok's per-request long-context tiering.

Model display and pricing

Display label: raw modelUsage key (e.g. grok-4.5-build)
Pricing candidates strip trailing -build and try xai/ / x-ai/ forms

Public surface

loader::load_entries
loader::has_data
report::summarize_entries
run

Depends on

ccusage-adapter-common
ccusage-core
jiff
serde
serde_json

Testing

Unit tests synthesize updates.jsonl fixtures (via ccusage-test-support) rather than committing real session trees, which would embed absolute paths and user prompts. Coverage spans path discovery, token split / pricing candidates, in-file and cross-session dedupe, timestamp resolution, summary metadata, and session report activity bounds.

# Requires CCUSAGE_PRICING_JSON_PATH (or Nix) for the embedded LiteLLM snapshot.
cargo test -p ccusage-adapter-grok

Live smoke

cargo test -p ccusage-adapter-grok smoke_real_grok_home_loads_without_error -- --ignored --nocapture

csusage-adapter-grok 0.0.2