# Update CheckpointID/trailer doc comments to mention ULIDs

`8a72620`→[main](/content/gh/entireio/cli/commits/main/index.html)·

Soph·2w ago·2 files·+5 added/-3 removed

Doc-only follow-up to the ULID understanding layer: the CheckpointID type comment
and the CheckpointTrailerKey comment still described the ID as "12 hex
characters." Note both supported formats (legacy 12-hex and 26-char ULID) and
point at the canonical id.CheckpointPattern / Kind.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

## Sessions

da0a3dbefa5eView transcript

## Changes

2

- cmd/entire/cli  
  
  - checkpoint/id  
  
    - Mid.go+3/-2  
  
  - trailers  
  
    - Mtrailers.go+2/-1

```
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"regexp"
// CheckpointID is a 12-character hex identifier for checkpoints.
// It's used to link code commits to metadata on the entire/checkpoints/v1 branch.
// CheckpointID identifies a checkpoint. It comes in two formats: a legacy
// 12-character lowercase hex ID and a 26-character Crockford base32 ULID (see
// Kind / CheckpointPattern). It links code commits to their checkpoint metadata.
//
//nolint:recvcheck // UnmarshalJSON requires pointer receiver, others use value receiver - standard pattern

type CheckpointID string
```

Mcmd/entire/cli/checkpoint/id/id.go+3/-2

```
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SourceRefTrailerKey = "Entire-Source-Ref"

// CheckpointTrailerKey links commits to their checkpoint metadata on entire/checkpoints/v1.
	// Format: 12 hex characters e.g. "a3b2c4d5e6f7"
	// Format: a checkpoint ID — either a legacy 12-hex ID (e.g. "a3b2c4d5e6f7")
	// or a 26-char ULID (see checkpoint/id.CheckpointPattern).
	// This trailer survives git amend and rebase operations.
	CheckpointTrailerKey = "Entire-Checkpoint"
```

Mcmd/entire/cli/trailers/trailers.go+2/-1