honey-ccr

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# Honey CCR

The cheapest token is the one not sent. A 500-row log read for one error line
costs 500 rows of context. CCR keeps the rows that carry signal and caches the
rest — recoverable by hash, so nothing is lost.

Borrowed from headroom's SmartCrusher. **Lossy by design** — only for data you
skim, never for payloads where every row matters (e.g. a code-review handoff
where the implementer needs all findings; use `eson encode` losslessly there).

## When to use

- A tool returns a **uniform JSON array** of many records (≥ ~5 items, redundant).
- You need to read it but mostly skim — logs, search hits, metrics, events.
- The full data stays reachable, so dropping the boring middle is safe.

## Don't use

- Small arrays (passes through untouched anyway) or non-array data.
- Any array where every element is load-bearing — encode it, don't crush it.

## How

```sh
tool-that-spews-json | eson crush          # → sampled view + sentinel; originals cached
eson retrieve <hash>                        # → the full original array, verbatim
```

`crush` prints the kept sample plus a sentinel
`{"_ccr":"<<ccr:HASH N_rows_offloaded>>"}`. When you need a dropped row, read the
hash from the sentinel and run `eson retrieve <hash>`.

- Cache dir: `.honey-ccr/` (override with `HONEY_CCR_DIR`).
- Below the size gate, `crush` returns the array unchanged with no sentinel — safe to pipe anything.

## Always-on hook (entry-time GC)

While Honey is active, a registered PostToolUse hook applies this automatically to
Bash output — no opt-in per call. Big uniform JSON arrays (≥20 items, ≥2k chars) are
crushed; repetitive text (≥25 lines) gets consecutive repeats collapsed to `⟨×N⟩`.
The original is always stashed first, and the rewritten result ends with the exact
`eson retrieve <hash>` command that restores it. `/honey off` disables the hook;
history already in context is immutable — this fires at entry, the only place a
hook can act.

Caveat: Claude Code builds affected by anthropics/claude-code#68951 ignore the
hook's Bash rewrite, making it inert (a session-start warning tells you when this
applies). Manual `some-tool | eson crush` piping is unaffected — prefer it there.

From sudo-tiz/opencode, MIT.

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