# Address ULID review: display, fetch-hint, docs, id-const, lazy mint

`c6fd45b`→[main](/content/gh/entireio/cli/commits/main/index.html)· Soph·1w ago·8 files·+136 added/-34 removed

Follow-ups from review of the git-refs ULID-emission PR (the id-kind read-routing item, #1, and the write-boundary kind guard, #2, are deferred — see below):

- id.CheckpointID.DisplayShort() (new): kind-aware trim — legacy hex shows its 12-char prefix, a ULID is shown in full (front-truncating a ULID drops its entropy tail and yields an ambiguous, unresolvable prefix).
- explain checkpoint-list view uses DisplayShort instead of a blind 12-char cut, so ULID checkpoints no longer collapse to near-identical timestamp prefixes.
- blame --long sizes the Checkpoint/Session column to its content (attributionCheckpointColumnWidth) so a 26-char ULID + session renders whole instead of being clipped to a session-less 21-char prefix.
- attach's fetch hint now resolves its target via resolveCheckpointFetchTarget — the same path FetchCheckpointRef uses — so the pasteable command matches the remote the fetch actually ran (fixes a bare "git fetch origin …" that fails in a token-only environment with an SSH origin).
- id.MaxIDLength ties to oklog/ulid's EncodedSize instead of a third hardcoded 26.
- eager-condense mints the checkpoint ID only after the skip checks, so a no-op session stop no longer pays the mint (and its checkpoints-config load).
- docs/architecture/sessions-and-checkpoints.md: checkpoint IDs are 12-hex OR ULID (not fixed-width), minted via checkpoint.GenerateCheckpointID.

Deferred to the id-kind read-routing follow-up (tracked separately):
- #1 attach routes presence/refresh/fetch-hint by current config, not by the trailer ID's kind — after a git-branch⇄git-refs flip attach looks in the wrong place and can suggest an unfixable fetch. This is the read-routing work the PR body already names; the two concrete attach dead-ends belong in that issue.
- #2 the ULID⇒refs invariant has no write-boundary guard. A naive "git-branch store saw a ULID → warn" misfires when git-branch is a *mirror* of a git-refs primary (a valid topology where ULIDs legitimately reach it), so the correct guard needs topology-role awareness and belongs with the routing work.

Tests: TestCheckpointID_DisplayShort, TestAttributionCheckpointColumnWidth.

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

## Sessions

14006b64f8d1View transcript

[?\ Build Checkpoints Store Based on DesignClaude Code·Opus 4.8[1m]·1 step](/content/gh/entireio/cli/session/6852b33a-0d22-4364-aa6c-8de706ecc215#timeline-14006b64f8d1/index.html)

## Changes

8

- cmd/entire/cli

- Mattach.go+6/-9

- Mattribution.go+24/-7

- Mattribution_test.go+28

- checkpoint/id

- Mid.go+22/-2

- Mid_test.go+27

- Mexplain.go+3/-6

- strategy

- Mmanual_commit_condensation.go+12/-8

- docs/architecture

- Msessions-and-checkpoints.md+14/-2

```go
return suggestFetchCommand(ctx, refName.String()+":"+refName.String())
```

// suggestFetchCommand builds a "git fetch <target> <refspec>" hint, preferring // the configured checkpoint remote URL when available and falling back to origin. // suggestFetchCommand builds a "git fetch <target> <refspec>" hint. It resolves // the target the same way attach's own fetch does (resolveCheckpointFetchTarget: // the checkpoint-remote/token URL if any, else origin) so the pasteable command // points at the remote the fetch actually used — not a bare "origin" that fails // in a token-only environment with an SSH origin.

func suggestFetchCommand(ctx context.Context, refspec string) string {
    if remote.Configured(ctx) {
        if url, err := remote.FetchURL(ctx); err == nil && url != "" {
            return fmt.Sprintf("git fetch %s %s", url, refspec)
        }
    }
    return "git fetch origin " + refspec
    return fmt.Sprintf("git fetch %s %s", resolveCheckpointFetchTarget(ctx), refspec)
}

func resolveCheckpointID(ctx context.Context, headCommit *object.Commit) (id.CheckpointID, bool) {
```

```go
func renderAttributionBlameLong(w io.Writer, result *fileAttributionResult, lineFlag string) {
    renderAttributionBlameTable(w, result, lineFlag, func(sty statusStyles) {
        lineWidth := attributionLineColumnWidth(result.Lines)
        const checkpointColumnWidth = 21
        fmt.Fprintf(w, "  %*s  Tag   %-12s  %-18s  %-16s  %-21s    Content\n",
            lineWidth, "Line", "Agent", "Model", "Author", "Checkpoint/Session")
        fmt.Fprintf(w, "  %s\n", sty.render(sty.dim, strings.Repeat("─", lineWidth+92)))
        // Size the Checkpoint/Session column to its content so a ULID checkpoint
        // (26 chars, vs a 12-hex ID) is not front-truncated into an unresolvable,
        // session-less prefix. The other columns sum to 71 alongside these two.
        cpWidth := attributionCheckpointColumnWidth(result.Lines)
        ruleWidth := lineWidth + cpWidth + 71
        fmt.Fprintf(w, "  %*s  Tag   %-12s  %-18s  %-16s  %-*s    Content\n",
            lineWidth, "Line", "Agent", "Model", "Author", cpWidth, "Checkpoint/Session")
        fmt.Fprintf(w, "  %s\n", sty.render(sty.dim, strings.Repeat("─", ruleWidth)));

for _, line := range result.Lines {
            fmt.Fprintf(w, "  %s  %s  %-12s  %-18s  %-16s  %-21s  %s %s\n",
            fmt.Fprintf(w, "  %s  %s  %-12s  %-18s  %-16s  %-*s  %s %s\n",
                sty.render(sty.dim, fmt.Sprintf("%*d", lineWidth, line.LineNumber)),
                renderAttributionTag(sty, line.Authorship),
                stringutil.TruncateRunes(line.Agent, 12, ""),
                stringutil.TruncateRunes(line.Model, 18, ""),
                stringutil.TruncateRunes(shortAuthorName(line.Author), 16, ""),
                stringutil.TruncateRunes(shortCheckpointSession(line), checkpointColumnWidth, ""),
                cpWidth, shortCheckpointSession(line),
                sty.render(sty.dim, attributionLineMarker(line)),
                renderAttributionContent(sty, line),
            )
        }

fmt.Fprintf(w, "  %s\n", sty.render(sty.dim, strings.Repeat("─", lineWidth+92)))
        fmt.Fprintf(w, "  %s\n", sty.render(sty.dim, strings.Repeat("─", ruleWidth)))
    })
}

// attributionCheckpointColumnWidth sizes the Checkpoint/Session column to the
// widest value it must show (header label or any rendered checkpoint/session),
// so ULID checkpoints render in full rather than being clipped to a 12-hex width.
func attributionCheckpointColumnWidth(lines []attributionLine) int {
    w := len("Checkpoint/Session")
    for i := range lines {
        if n := len(shortCheckpointSession(lines[i])); n > w {
            w = n
        }
    }
    return w
}

func renderAttributionSummary(w io.Writer, sty statusStyles, summary attributionSummary, lineFlag string) {
    parts := []string{
        sty.render(sty.green, fmt.Sprintf("AI: %d (%d%%)", summary.AILines, summary.AIPercentage)),
    }