Context Packer | Nixfred AI Systems Workbench

Budget

Total tokens available for this context window.

Budget preset

Optional shortcut. Sets the budget field above.

Packing strategy

Awaiting input

No context blocks yet

Add a labeled block for each piece of context an agent would receive, mark the ones that must never be dropped, and choose a budget. Or load the sample to see a realistic agent task packed for you.

Context blocks

Pack status

Whether this pack is feasible at all, before anything else is decided.

Idle

Stale Inputs changed after this result was produced. Run it again to see numbers that match what is on screen.

Packed order

What made it in, in final order, and why each block landed where it did.

Idle

Stale Inputs changed after this result was produced. Run it again to see numbers that match what is on screen.

Excluded blocks

What did not fit under the chosen strategy, and how short it was.

Idle

Stale Inputs changed after this result was produced. Run it again to see numbers that match what is on screen.

Suggested summarization targets

A starting point for how much a block would need to shrink to fit. A suggestion, not a rewrite.

Idle

Stale Inputs changed after this result was produced. Run it again to see numbers that match what is on screen.

Fixed rules this pack leans on

Every value below is stated, not hidden.

Manual token estimates: Taken exactly as entered from your input fixed
Pasted content token estimate: 1 token per 4 characters from heuristic, not a tokenizer fixed
Value density priority weight: Highest priority block scores N, lowest scores 1 from fixed rule fixed
High truncation risk threshold: Under 2% of budget left unused from fixed rule fixed
Medium truncation risk threshold: Under 10% of budget left unused from fixed rule fixed

Export

Note Why not just find the optimal pack?

Packing blocks into a budget is a knapsack problem, and solving it exactly gets expensive fast as the number of blocks grows. Every strategy here is a deterministic greedy rule instead: it states what it is optimizing for, tries blocks in that order, and takes the first ones that fit. That is not the best possible pack. It is an honest, explainable one, and the reason attached to every block says exactly which rule put it there or left it out.

The one rule that is never greedy is required content. It is reserved first, unconditionally, before any strategy runs. If it does not fit, nothing gets packed at all, and the tool says so instead of quietly leaving a required block behind.