@cloudflare/codemode@0.5.2

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

Upgrading?

AI Summary

Improved JSON truncation logic to handle oversized objects structurally, preventing invalid JSON output. Added `toModelOutput` projection and updated MCP servers to apply response budgets.

Key Highlights

  • Structural truncation replaces slicing to ensure valid JSON output for oversized results.
  • Added `toModelOutput` to project calls and bound sandbox logs.
  • MCP servers now apply response budgets to emitted text.

New Features

  • Structural truncation for strings, arrays, and objects with specific suffixes (e.g., '--- TRUNCATED ---').
  • Projection of `calls` out of model context.
  • Bounded sandbox logs to prevent context overflow.

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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