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Update traces to include cache tokens #248

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Sep 11, 2025
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Update traces to include cache tokens #248

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8 changes: 8 additions & 0 deletions docs/user-guide/observability-evaluation/traces.md
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,8 @@ Each trace consists of multiple spans that represent different operations in you
| - gen_ai.usage.completion_tokens: <number> |
| - gen_ai.usage.output_tokens: <number> |
| - gen_ai.usage.total_tokens: <number> |
| - gen_ai.usage.cache_read_input_tokens: <number> |
| - gen_ai.usage.cache_write_input_tokens: <number> |
| |
| +-------------------------------------------------------------------------------+ |
| | Cycle <cycle-id> | |
Expand All @@ -56,6 +58,8 @@ Each trace consists of multiple spans that represent different operations in you
| | | - gen_ai.usage.completion_tokens: <number> | | |
| | | - gen_ai.usage.output_tokens: <number> | | |
| | | - gen_ai.usage.total_tokens: <number> | | |
| | | - gen_ai.usage.cache_read_input_tokens: <number> | | |
| | | - gen_ai.usage.cache_write_input_tokens: <number> | | |
| | +-----------------------------------------------------------------------+ | |
| | | |
| | +-----------------------------------------------------------------------+ | |
Expand Down Expand Up @@ -179,6 +183,8 @@ Strands traces include rich attributes that provide context for each operation:
| `gen_ai.usage.completion_tokens` | Total tokens used for completions |
| `gen_ai.usage.output_tokens` | Total tokens used for completions (duplicate) |
| `gen_ai.usage.total_tokens` | Total token usage |
| `gen_ai.usage.cache_read_input_tokens` | Number of input tokens read from cache (Note: Not all model providers support cache tokens. This defaults to 0 in that case) |
| `gen_ai.usage.cache_write_input_tokens` | Number of input tokens written to cache (Note: Not all model providers support cache tokens. This defaults to 0 in that case) |

### Cycle-Level Attributes

Expand Down Expand Up @@ -209,6 +215,8 @@ Strands traces include rich attributes that provide context for each operation:
| `gen_ai.usage.completion_tokens` | Total tokens used for completions |
| `gen_ai.usage.output_tokens` | Total tokens used for completions (duplicate) |
| `gen_ai.usage.total_tokens` | Total token usage |
| `gen_ai.usage.cache_read_input_tokens` | Number of input tokens read from cache (Note: Not all model providers support cache tokens. This defaults to 0 in that case) |
| `gen_ai.usage.cache_write_input_tokens` | Number of input tokens written to cache (Note: Not all model providers support cache tokens. This defaults to 0 in that case) |

### Tool-Level Attributes

Expand Down