Throughline

Throughline

Keep the thread — Task Track within a session, Handoff across them.

> For any AI agent reading this file. The frontmatter uses Claude's skill format; the > body is plain markdown. It works the same for Claude, OpenAI, Gemini, Cursor, Cline, Aider, > or a local model — paste the body in as a prompt if your platform has no skill system. > Assume nothing about your host's capabilities; everything here degrades gracefully > (see "Capability-agnostic by design" below).

What this is

Long or multi-agent work fails in two predictable ways, and this skill is two habits that each kill one of them:

• Within a session, reasoning drifts off the goal. You solve a small problem, which

surfaces another, which pulls you somewhere adjacent to what you started on. Every step is locally reasonable; together they bend the trajectory. Task Track makes that drift visible by keeping one ⭐️ MAIN goal anchor in front of you.

• Across sessions, the thread is dropped. A fresh run (or a different agent) starts cold,

re-derives what was already known, or trusts a stale summary. Handoff carries the thread forward as a plain-text artifact any agent can pick up.

The correlation — the load-bearing point. The ⭐️ MAIN tag is the shared goal anchor. Task Track holds it within a run; Handoff carries it (plus state) across runs. One sentence: don't lose the thread — within a session or between them. The same anti-drift purpose runs through both, which is why they ship together.

When to use

• A long or many-step task at real risk of losing the thread → set up Task Track. (For a

short, self-contained task that finishes in one pass, skip it — the overhead isn't worth it.)

• You notice the work has wandered → re-read the ⭐️ MAIN and decide if you've drifted.
• Wrapping up, running low on context, or switching agents → write a Handoff.
• Beginning a session that has a prior handoff → run the Resume flow.

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Part 1 — Task Track (the within-session half)

Keep a task list where exactly one task is the ⭐️ MAIN — the goal anchor — and every other task carries a leading emoji marking where it came from, so drift reads at a glance:

| Tag | Meaning | |---|---| | ⭐️ MAIN | The session's primary task / goal anchor. Exactly one at a time. Re-read it before any load-bearing step: "am I still solving the MAIN, or something it slid into?" | | 🌶️ Critical | A critical bug or big-impact task in service of the MAIN. | | 🍏 Temp this session | Surfaced mid-session, not in any plan. A transient. If it balloons past the MAIN's scope → stop and re-confirm with the human, don't let it silently become the main line. | | 🍋 Logged + recurred / pulled-in | A previously-logged task that came back, OR a logged task not planned for this session but worth doing now. |

Put the emoji in the task's title (the always-visible spot), not just in a description field — if your task UI renders badges, use those too, but the title is the reliable channel.

The discipline, not the decoration: the value isn't the emoji, it's that the trajectory becomes legible. At any moment you can scan the list and see whether the work is still on the main line or chasing transients. When a 🍏 keeps growing, that's the signal to stop and check it against the ⭐️ MAIN.

Full rationale, examples, and how it pairs with Handoff: references/task-track.md.

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Part 2 — Handoff (the across-session half)

When wrapping up, write a plain-markdown handoff the next agent can pick up cold. The doc — not a file, not a tool, not your platform — is the universal interface: any agent and any human can read plain markdown.

Writing a handoff (the handoff operation — see commands/handoff.md):

1. Fill the shared template templates/handoff.template.md. It is the single source of truth

for a handoff's structure; do not invent your own sections. The core sections:

• ⭐️ Goal — the one thing the next session is for (carry the MAIN forward).
• State — where things stand now; mark anything unverified.
• Done — what got completed (briefly).
• Open / Next — open threads + recommended next move, in priority order.
• Re-derive on pickup — what the next agent must reconcile against ground truth before

trusting this doc.

• Suggested next steps / tools / skills — concrete next actions and capabilities to reach for.
• References — point to plans, specs, issues, commits, diffs, docs by path/URL.

1. Reference, don't duplicate. If a fact already lives in a plan, issue, commit, or diff,

link it — don't copy it. Copies go stale; references stay single-source.

1. Redact secrets. No API keys, tokens, passwords, or personal data. Sweep before saving.
2. Keep it bounded. A handoff is the latest state plus pointers — not a running log of

every session. If the project keeps a longer history, link to it; don't grow the handoff into a second log.

1. Save it where the next agent will look — if you can write files, the OS temp dir or an

agreed handoff path; if you can't, just emit the doc inline in your reply.

Resuming from a handoff (the resume operation — see commands/resume.md):

1. Read the handoff and restate the ⭐️ Goal back, so the human sees you've oriented.
2. Re-derive before trusting. Follow the doc's "Re-derive on pickup" section: re-read the

named artifacts, re-run the named check, re-confirm cited facts are still current. A snapshot trusted blindly is exactly how stale state causes drift.

1. Set up Task Track with the carried-forward ⭐️ MAIN, then confirm the plan before executing.

Full protocol, the five anti-drift mechanisms, and why each exists: references/handoff.md.

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Capability-agnostic by design

The next agent may be on any platform, so assume no specific function exists. Each capability has a graceful fallback:

| If you have… | use it for… | If you don't… | |---|---|---| | File-system write | saving the handoff to a known path | emit the handoff inline in your reply — the doc is the deliverable, not the file | | Live access (web, repo, tools) | re-deriving state against ground truth | re-derive from the artifacts you were handed; flag what you couldn't verify | | Code execution | the optional tools/handoff.py validator | skip it — the prompt does the whole job without it | | A skill / slash-command system | invoking handoff / resume as commands | paste the relevant section in as a plain prompt |

The two reasoning disciplines — the ⭐️ MAIN goal anchor and re-derive-don't-trust — have zero capability dependency, so they hold at the lowest common denominator.

Optional helper (code-capable environments only)

tools/handoff.py is a single-file, zero-dependency (Python stdlib) helper that does only the mechanizable half — it never summarizes:

python3 tools/handoff.py new                 # scaffold a blank handoff from the template
python3 tools/handoff.py check HANDOFF.md    # validate: sections present, one ⭐️ MAIN,
                                             # re-derive note present, secret-pattern sweep

It reads the required sections from the shared template at runtime, so the validator and the prompt can never drift on structure. It's optional — if you can't run code, the skill is complete without it.

Files in this skill

| File | Purpose | |---|---| | SKILL.md | This file — the two habits and how they connect. | | commands/handoff.md | The write operation (drop-in slash command + paste-in prompt). | | commands/resume.md | The read / pick-up operation. | | templates/handoff.template.md | Single source of truth for handoff structure. | | references/task-track.md | The within-session discipline, in depth. | | references/handoff.md | The across-session protocol (the five anti-drift mechanisms), in depth. | | examples/example-handoff.md | A filled-in handoff to copy the shape from. | | tools/handoff.py | Optional stdlib scaffold/validate helper. | | assets/logic-flow.svg | Diagram of how the two halves connect. |

License

MIT. Free to use, modify, embed, redistribute. Attribution appreciated.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: jovesun-lab
• Source: jovesun-lab/whetstone
• License: MIT

Install and usage instructions live in the source repository linked above.