Know a prompt's price before you send it. Stop the agent without paying a turn. Find the right session among ten open. 23 utilities for the small moments that cost the most.
13 utilities on Basic FREE, 8 on Pro and 2 on Ultra.
Everything runs on your machine, with no login.
Paste a prompt, press Trim and watch the size drop. Then multiply by the turns: everything at the start of the conversation is re-read on every turn that follows.
Original in the sessionUS$ 0.00
Trimmed in the sessionUS$ 0.00
Kept in your pocketUS$ 0.00
Spend estimate: about 4 characters per token, with no cache discount.
Simplified demo. Here only the local rules of the Prompt Optimizer act; in the product, your account's official claude still tries a smaller version, and if it doesn't win, the original comes back unchanged. The real Token Calculator uses the model's billing tiers and shows, alongside, the spend measured in your sessions.
While the conversation is alive, coming back and typing keeps the discount for free. The trouble is a long pause, switching models mid-work and CLAUDE.md edited while the session is open. Three utilities watch those moments for you.
The warning dot in this preview is illustrative. Cache Lock holds the return above 55 minutes.
Typing “stop!” in the chat makes the model re-read the whole context just to hear the order. Here the command arrives at the next tool call, with no message and no paid turn.
Illustrative preview. No real session is touched.
Grouped by the moment they show up in your day. Filter by plan to see what already comes with Basic FREE.
Know the cost upfront, and don't lose the discount you already had.
Turns a text or a token count into a cost, in each billing tier of the model. Alongside, the spend measured in your sessions shows up, so you can forecast the price of a big prompt before you send it.
No mental math and no table to memorize.A system notification warns you when an idle conversation is about to lose its cache discount. Coming back and typing while it's still alive keeps the discount for free.
Warns you before an action that would drop the discount, like switching models or plugins mid-work. Also holds the return to a conversation idle for more than 55 minutes.
When the discount drops, it tells you why. Covers changes at the start of the conversation, like editing CLAUDE.md with the session open, so the same drop doesn't happen twice.
Spots a side question and suggests asking it with /btw, which answers without growing the conversation. The context doesn't grow with what isn't part of the task.
Write less, repeat less and fix the route without typing it out in the chat.
Rewrites the prompt shorter and more direct, cutting courtesy, detours and repeated sentences, and keeps the code in backticks intact. Local rules make the first cut, and your account's official claude tries an even smaller version.
You describe the idea in your own words and get a complete prompt, ready for another AI tool. 34 types in 7 groups, and the history keeps the last 30 creations.
Stores the prompts you repeat every day. One click copies them, and then you just paste them into the conversation with the agent.
Slips a line of yours into the running session, at the next tool use, without showing up as a message in the chat. Fixes the route without spending a whole turn.
Copies the master instructions file of one harness into the format of the others, with no model and no cost. The same rules apply to every agent you use.
Lots of tabs, lots of accounts. Find, mark, pause and stop the right session.
Gathers the sessions from every account and source on one screen: CLI, desktop app, IDE, SDK and Code Deck. Each session becomes a card with branch, worktree, account, model, turns and cost.
Filters by project, and flagged and important sessions.A short tag and a note for each open session, so you can tell which is which at a glance. Both also show up in the Session Panel.
Two timers in the corner of the screen: the time the agents worked and yours. Accepts up to 5 time zones and keeps the history by day.
Stops the chosen session at the next tool call, with no message in the chat. The model doesn't re-read the whole context just to receive the order to stop.
Pauses the session without ending it. The agent waits, spending no credits, until you resume with 1 click, and picks up where it left off.
Stops the agent from killing a process or port, so it can't take down the local server you left running. What it started itself, it can still stop.
Bundles the latest handoff from Renew Session and the one from Context Graph into a single image. In the new session, Ctrl+V and the context comes along.
Clear the mess out of the way, keep what matters and install only what has been vetted.
Finds the work leftovers scattered across the project, like .tmp, .bak, logs and forgotten drafts, and puts everything in quarantine. Nothing is erased for good: one click restores it.
Cleans up the leftovers agents leave on disk. First it shows the count and size of what goes and asks for your confirmation.
It's the only HarnessUp action that deletes without keeping a copy. That's why nothing goes without your yes.Takes pasted text or a screenshot, works out what it is (code, data, log, prompt or note) and saves the snippet to the right folder, with a name. The screenshot becomes text through Windows' own OCR, without leaving your machine.
A curated catalog of agents, skills, MCPs and vetted tools, installed with one click through the Secure Installer, instead of downloaded from anywhere.
A Snyk audit from Feb/2026 found 1,467 malicious payloads in 3,984 skills analyzed.Two phrases you'd type every week, turned into commands.
The model re-explains, in plain language and for non-experts, the part you didn't get. Useful when the answer comes out too technical.
Explains the agent's latest decision question: what it suggests, the pros and cons of each option and what changes for the person using the product. The choice stays with you, and it doesn't implement anything first.
Trash Killer moves the leftovers to quarantine and leaves the way back open. Temps Clean erases for good, so it shows the bill first and waits for your yes.
Sample project. None of your files are touched.
Install HarnessUp, open the panel and turn the utilities on with one click. Thirteen of them already come with Basic FREE, along with the measurement layer.
help@harnessup.devNo. Everything inside backticks stays intact. It cuts courtesy, detours and repetition from the surrounding text, and if no version comes out shorter, your original prompt comes back unchanged.
Both act at the next tool call, without sending a message in the chat, so there's no paid turn to give the order. During a Coffee Brake pause there's no credit spend.
Only Temps Clean, and only after it shows the count and size and gets your confirmation. Trash Killer moves things to quarantine, and everything comes back with one click.
You only change this page. Sessions, files, prices and times are examples. Nothing on your computer is changed and no data leaves the browser.