Yadnesh Salvi

Topic · 142 stories

Harnesses & tools

The code around the model: tool access, context handling, subagent orchestration, and the harness-level features that increasingly decide what an agent can finish.

Stories

Issues that covered it

  1. Daily

    Most of a harness-evolution gain is overfitting and extra compute

    Plus: Monzo's 1,800 agent tasks a day, and a credential the agent thought was yours. 5 min.

    Oct 22, 2026 · 5 min

    A wide bar feeds into a three-way chute that splits it into three trays below. The left tray is heaped nearly full, the middle a quarter full, the right holds one small cube with calipers resting against it.
  2. Daily

    Claude Code's Bash tool changed 12% of calls carrying code or escapes

    Plus: UndoBench, a Copilot CLI secret leak, and what Codemode is for. 5 min.

    Oct 07, 2026 · 5 min

    A row of relay stations along a conveyor belt. An instruction card enters clean at one end, gets nudged by a small arm inside each station, and drops out altered at the other end. A dashed line above traces the unchanged card the sender believes was delivered.
  3. Daily

    Branch steering breaks the Dual-LLM guarantee for computer-use agents

    Plus: swarms borrowing public URL scanners, pipelines that go wrong under replay. 5 min.

    Oct 06, 2026 · 5 min

    A rail line splits into two already-laid branches. A long scroll of printed page content leans against the switching lever at the junction and pushes it toward the lower branch, which ends at a strongbox with its lid ajar.
  4. Daily

    VS Code rebuilt its release process around agents and now ships weekly

    Plus: an agent that writes its own tools, and a support bot at 80%. 5 min.

    Oct 05, 2026 · 5 min

    A conveyor belt crosses the frame carrying four stamped crates under three inspection arches, each with a jointed arm reaching down. One crate sits alone on a side spur beside the first arch. Above, a row of twenty small robots each feeds an arrow into the belt's left end.
  5. Daily

    Six ways an agent harness can run something other than what you approved

    Plus: elaborate harnesses lose to a plain coding agent. 5 min.

    Oct 02, 2026 · 5 min

    A desk from above. A stamped sheet sits in a tray lettered APPROVED and travels through a sealed cabinet. A different sheet emerges into a tray lettered EXECUTED, carrying the same stamp but different text, with a carbon copy of the first sheet beside it.
  6. Daily

    A forged chat-template marker loses most of its authority as ordinary subwords

    Plus: 5 papers, 3 builder posts, 9 quick links. 5 min.

    Oct 01, 2026 · 5 min

    Two parallel tracks cross the frame toward a tall box on the right. The upper track carries one large tile through a wide arrow. The lower track carries the same text split across eight small tiles through a narrow arrow. A switch lever sits between the tracks beside a server rack.
  7. Daily

    Agent context compression can cut tokens by two thirds and still run slower

    Plus: a rescored injection benchmark, Letta's self-written workflows. 5 min.

    Sep 30, 2026 · 5 min

    Two arrangements side by side on a table. On the left, a tall loose stack of paper next to a small clock whose hand has moved a short way round the dial. On the right, the same paper pressed into one flat dense block, next to an identical clock whose hand has travelled much further.
  8. Daily

    AISI finds GPT-6 Astra attacking out of scope during a cyber evaluation

    Plus: five papers, METR's per-action monitor, and nine quick links. 5 min.

    Sep 29, 2026 · 5 min

    A low square fence encloses a workbench with one card on it. A line of footprints leaves the bench, passes through a gap in the fence, and branches into three trails that each end at a small closed parcel outside.
  9. Daily

    Agent-written pull requests match human ones on revert rates, and fail differently

    Plus: two papers pricing what agent context costs to serve and to keep. 5 min.

    Sep 28, 2026 · 5 min

    Two chutes drop equal stacks of paperwork into one central review tray. Below the tray, three labelled bins catch different contents: identical small tags, almost nothing, and a heap of long curling ribbons.
  10. Daily

    Forged control tokens blank an agent's reasoning while the tool call still fires

    Plus: a completion gate you can prove, and 8 tools where 83 were. 5 min.

    Sep 25, 2026 · 5 min

    A cross-section of a pipeline. An envelope enters a rendering box on the left and splits into two tracks. The upper track, marked REASONING, carries a blank scroll watched by two lenses on stands. The lower track, marked TOOL CALL, carries a sealed packet through an open valve and out of the arrangement.

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