deepseek-ai/deepseek-harness · error · Error

dsh-tools: no run_code schema flavor registered for runtime

Error message

dsh-tools: no run_code schema flavor registered for runtime language ${JSON.stringify(runtime.language)} (known: ${known})

What it means

Error "dsh-tools: no run_code schema flavor registered for runtime language ${JSON.stringify(runtime.language)} (known: ${known})" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/core/tools/src/code-mode.ts:129

 * `SDK_RENDERERS` is the compiler's job ({@link CodeSdkLanguage}); what this
 * guard owns is the runtime-supplied language neither table knows, which never
 * yields a wrong-language schema for a real runtime.
 */
function resolveFlavor(peekRuntime: () => CodeRuntime | undefined): RunCodeFlavor {
  const runtime = peekRuntime()
  if (runtime === undefined) {
    // No runtime mounted: reached by definition readers and `schemas()`, of
    // which the doc-catalog harvest is the only shipped one. None feeds a
    // model — `wireSchemas` calls `requireCodeRuntime` before projecting, so
    // the assembly path never arrives here. Degrade to the TS default.
    return TYPESCRIPT_FLAVOR
  }
  // Own-property read: a language like `toString`/`constructor` would otherwise
  // resolve an inherited Object.prototype member as a flavor.
  const flavor = RUN_CODE_FLAVORS[runtime.language]
  if (!Object.hasOwn(RUN_CODE_FLAVORS, runtime.language) || flavor === undefined) {
    const known = Object.keys(RUN_CODE_FLAVORS).map(name => JSON.stringify(name)).join(', ')
    throw new Error(`dsh-tools: no run_code schema flavor registered for runtime language ${JSON.stringify(runtime.language)} (known: ${known})`)
  }
  return flavor
}

/**
 * Thrown by `run_code` when the program run itself failed — a program
 * exception, a budget expiry, an abort, or substrate death. Extends
 * {@link HarnessError} (`code: 'CODE_RUN_FAILED'`); the registry's execution
 * pipeline converts it into a structured `isError` result whose text carries
 * the failure kind plus the captured logs, so the model can self-correct.
 */
export class CodeRunFailedError extends HarnessError {
  constructor(message: string) {
    super(message, 'CODE_RUN_FAILED')
    this.name = 'CodeRunFailedError'
  }
}

View on GitHub (pinned to b150a551b8)

When it happens

Trigger: Thrown at packages/core/tools/src/code-mode.ts:129 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/253ba902eb76c08d. Report an issue: GitHub.