A session handoff tool that saves the current work state in files so another session can continue later. A handoff records progress and next steps, while reusable knowledge is kept separately.

Use it before ending a session, switching work streams, or preserving progress for a fresh session.

It reduces the risk of losing context when a session ends, changes to another task, or runs out of context.

compress — Skill for Claude Code by ph3on1x: A session handoff tool that saves the current work…

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add ph3on1x/wisci

Claude Code

/plugin install wisci

Made for: Claude Code.

Or install wisci, the plugin that ships this one along with the rest of its 5 skills, 2 hooks.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/ph3on1x/wisci/compress.svg)](https://agentmods.dev/skills/ph3on1x/wisci/compress)

Your own site

<a href="https://agentmods.dev/skills/ph3on1x/wisci/compress"><img src="https://agentmods.dev/badge/skills/ph3on1x/wisci/compress.svg" alt="Measured on agentmods" height="20"></a>

Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,245 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00056	$0.01245
Opus 5	$0.00028	$0.00622
Sonnet 5	$0.00011	$0.00249
Haiku 4.5	$0.00006	$0.00125

Measured 5d ago against content hash ed1cdf444831, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

compress scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/wisci.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/compress/SKILL.md · 94 lines

How it starts

The opening of the file, as written. The whole thing — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/compress — Session Handoff Snapshots

Capture everything a fresh session needs to resume the current work. Each independent work stream gets its own file in .wisci/handoff/ — one writer per stream, so snapshots from different sessions never clobber each other. An index (.wisci/handoff.md) is regenerated by script, never written by hand.

Boundary: /compress stores work state (goal, progress, next steps). Reusable knowledge (research results, architecture notes, decisions worth keeping after the work ships) belongs in /write. If the session produced knowledge, tell the user to run /write <topic> — do not bury it in a handoff.

Current state

Timestamp: !date '+%Y-%m-%d %H:%M'

Existing handoff streams: !python3 "${CLAUDE_PLUGIN_ROOT}/scripts/wisci.py" index --list

If the streams listing above shows an error or an unexpanded variable, run the bundled script manually: it is at scripts/wisci.py relative to this skill's directory. Run python3 <that path> index --list with Bash.

Execution Flow

Identify work streams. Review the session and list the independent streams of work it contains (usually one). A stream is work that would be resumed as a unit.
Match streams to leaves. Compare each session stream against the existing streams listed above (slug + goal):
- Clear match — this session continued that stream: update its leaf.
- No match — new leaf. Derive a slug from the stream's goal (kebab-case, lowercase, max 4 words). Never derive slugs from dates or branch names.
- Ambiguous match — create a new leaf. A fragmented stream is cheap to merge later; a wrongly merged one loses state. When creating due to ambiguity, mention the similar existing stream in your report.
- If $ARGUMENTS names a stream, use it verbatim as the slug and skip matching.
Write each leaf to .wisci/handoff/<slug>.md (create directories as needed) using the leaf format below.
- Union snapshot within the stream: capture the stream's full current state — including still-open items carried from the existing leaf — not just this session's delta.
- Never touch leaves for streams this session did not work on.
- A stream that finished: set status: done. A stream waiting on something external: status: blocked and name the blocker.

Read the full file on GitHub · 94 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

scripts/wisci.py 25 B runs code

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

5d ago First seen · 94 lines · 56 tokens per session scan A ed1cdf444831

Subscribe to this mod's changes

compress is a skill published in the GitHub repository ph3on1x/wisci (1 stars, last pushed 2mo ago), licensed MIT. It adds 56 tokens to every session and 1,245 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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compress