# fix token diagnostics review feedback

## Sessions

a9f752ac37dfView transcript

## Changes

4

- cmd/entire/cli
  
  - Mcheckpoint_tokens.go+46/-14
  
  - Msession_tokens.go+19/-4
  
  - Msessions_test.go+50

- Dt1.txt-1

```
37 unmodified lines

```

Short: "Show token usage and optimization recommendations for a checkpoint",
        Long: `Show token usage and optimization recommendations for a checkpoint.

The report reads committed checkpoint metadata and is local and deterministic.
Checkpoint IDs may be abbreviated as long as the prefix is unambiguous.`,
        Args: cobra.ExactArgs(1),
        RunE: func(cmd *cobra.Command, args []string) error {
            return runCheckpointTokens(cmd.Context(), cmd, args[0], jsonFlag)

```

```go
func buildCheckpointTokensReport(cpID id.CheckpointID, summary *checkpoint.CheckpointSummary, metas []*checkpoint.CommittedMetadata) checkpointTokensReport {

usage := aggregateCheckpointTokenUsage(metas)

if metadataWarnings > 0 {
        report.Limitations = append(report.Limitations, fmt.Sprintf(
            "%d checkpoint session metadata file%s could not be read; used root token summary or readable session metadata where available.",
            metadataWarnings,
            tokenPluralSuffix(metadataWarnings),
        ))
    }
}
```

```go
func TestCheckpointTokensReport_UsesRootSummaryWhenSessionMetadataIncomplete(t *testing.T) {
    cpID := id.MustCheckpointID("abc123abc123")
    report := buildCheckpointTokensReport(
        cpID,
        &checkpoint.CheckpointSummary{
            CheckpointID: cpID,
            Sessions: []checkpoint.SessionFilePaths{
                {Metadata: "0/metadata.json"},
                {Metadata: "1/metadata.json"},
            },
            TokenUsage: &agent.TokenUsage{
                InputTokens:  1000,
                OutputTokens: 500,
                APICallCount: 7,
            },
        },
        []*checkpoint.CommittedMetadata{
            {
                SessionID: "readable-session",
                TokenUsage: &agent.TokenUsage{
                    InputTokens: 100,
                },
            },
        },
        1,
    )

if report.Tokens == nil {
        t.Fatalf("expected token data, got nil")
    }
}
```