@cloudflare/codemode@0.5.2

dmtrKovalenko/fff@cloudflare/codemode@0.5.2Sep 11, 2026by github-actions[bot]

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AI Summary

This patch release improves how structured results are truncated to prevent the model from receiving invalid JSON. It introduces a projection layer to limit sandbox logs sent to the model and applies response budgets to MCP servers.

Key Highlights

  • Structured truncation shrinks strings, arrays, and objects in place instead of slicing JSON.
  • New `toModelOutput` projection bounds sandbox logs sent to the model.
  • MCP servers now apply response budgets to text they emit.
  • Fixes issues related to oversized objects and model context assembly.

New Features

  • Structural truncation logic for oversized results
  • Projection layer for limiting sandbox logs
  • Response budget enforcement for MCP servers

Full Release Notes

### Patch Changes

-   [#2224](https://github.com/cloudflare/agents/pull/2224) [`dcca089`](https://github.com/cloudflare/agents/commit/dcca0896cc829e4a602a1feb47466ac79d1ca096) Thanks [@mattzcarey](https://github.com/mattzcarey)! - Truncate structured results structurally instead of slicing their JSON.

    `truncateResult` (the default `transformResult` in Think's execute tool and the browser tools) and the `codeMcpServer` / `openApiMcpServer` response path used to pretty-print an oversized object and cut it at a character count, leaving the model with half a JSON document. Oversized values are now shrunk in place, largest values first: strings are clipped with a `--- TRUNCATED --- <n> chars` suffix, arrays keep their leading items and end with a `--- TRUNCATED --- <n> more items` element, and an object only loses entries (largest first, named in a `"--- TRUNCATED ---"` entry) when its values cannot share the budget. The output is always valid JSON of the original shape and small values pass through untouched.

    The Code Mode tool now carries a `toModelOutput` that projects `calls` out of what the model sees and bounds the sandbox `logs` the same way a result is bounded. The durable call log — every connector call's args and result — stays on the persisted tool part for UIs and audit, but no longer rides into the model's context uncapped alongside the transformed `result`. The projection never throws: a BigInt or cyclic value is rendered rather than failing a completed run at model assembly.

    The MCP servers apply the response budget to the text they emit, pretty-printing only while that still fits.

    Fixes [#2009](https://github.com/cloudflare/agents/issues/2009), [#2143](https://github.com/cloudflare/agents/issues/2143) and [#2182](https://github.com/cloudflare/agents/issues/2182).

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