deepseek-ai/deepseek-harness · error · Error

dynamic package `code.host` failed to parse: ${context} Note

Error message

dynamic package `code.host` failed to parse:
${context}
Note: it runs as the BODY of an async function (line numbers are offset by the 1-line wrapper). Check bracket balance — ending the returned plugin object with `});` closes a call that was never opened; a plain `return { … }` ends with `}` (an optional `;`), never `).

What it means

Error "dynamic package `code.host` failed to parse: ${context} Note: it runs as the BODY of an async function (line numbers are offset by the 1-line wrapper). Check bracket balance — ending the returned plugin object with `});` closes a call that was never opened; a plain `return { … }` ends with `}` (an optional `;`), never `)." thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/extensions/cordis-host-runner/src/sandbox.ts:263

 * bounds the SYNCHRONOUS portion; an async body escapes it — acceptable under the module's
 * trust stance. Parse errors include the offending line and a TypeScript-removal or bracket-
 * balance hint.
 * @param sandbox - the contextified object from {@link createSandbox}.
 * @param code - the model-written function body; must `return` a plugin.
 * @param id - the package id, used as the vm filename (`cordis-dyn-<id>.js`).
 * @param vmTimeoutMs - the synchronous evaluation bound in milliseconds.
 * @returns whatever the code returned, still un-narrowed (the run lifecycle checks plugin shape).
 */
export async function evaluateHostCode(sandbox: object, code: string, id: string, vmTimeoutMs: number): Promise<unknown> {
  try {
    return await runInContext(
      `(async () => {\n${code}\n})()`,
      sandbox,
      { filename: `cordis-dyn-${id}.js`, timeout: vmTimeoutMs },
    )
  } catch (error) {
    if (!isSyntaxError(error)) throw error
    throw new Error(parseErrorMessage('code.host', syntaxErrorContext(error)))
  }
}

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/extensions/cordis-host-runner/src/sandbox.ts:263 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/086c4ac6acdd546b. Report an issue: GitHub.