nanocoai/nanoclaw · error · StdinJsonInputError

--stdin-json key "${key}" conflicts with argv key "${argvKey

Error message

--stdin-json key "${key}" conflicts with argv key "${argvKey}" after CLI key normalization

What it means

After CLI key normalization (the canonicalization crud.ts parsers apply, e.g. dashes/underscores or alias collapsing), a stdin key maps to the same canonical form as an argv key, so they would silently override each other.

Source

Thrown at src/cli/stdin-json.ts:122

  for (const key of Object.keys(argvArgs)) {
    const canonical = canonicalArgKey(key);
    if (!argvKeysByCanonical.has(canonical)) argvKeysByCanonical.set(canonical, key);
  }

  const stdinKeysByCanonical = new Map<string, string>();
  for (const key of Object.keys(stdinArgs)) {
    if (key === '__proto__') {
      throw new StdinJsonInputError('--stdin-json key "__proto__" is not allowed');
    }

    if (Object.prototype.hasOwnProperty.call(argvArgs, key)) {
      throw new StdinJsonInputError(`--stdin-json key "${key}" is also supplied on argv`);
    }

    const canonical = canonicalArgKey(key);
    const argvKey = argvKeysByCanonical.get(canonical);
    if (argvKey !== undefined) {
      throw new StdinJsonInputError(
        `--stdin-json key "${key}" conflicts with argv key "${argvKey}" after CLI key normalization`,
      );
    }

    const priorStdinKey = stdinKeysByCanonical.get(canonical);
    if (priorStdinKey !== undefined) {
      throw new StdinJsonInputError(
        `--stdin-json keys "${priorStdinKey}" and "${key}" conflict after CLI key normalization`,
      );
    }
    stdinKeysByCanonical.set(canonical, key);
  }
}

View on GitHub (pinned to 294ef2aee8)

Solutions

1. Pick one spelling and keep that option in only one of argv or stdin JSON

Example fix

# before
ncl wirings create --agent-group a1 --stdin-json <<< '{"agent_group": "a2"}'
# after
ncl wirings create --stdin-json <<< '{"agent_group": "a2"}'

const canon = (k: string) => k.replace(/-/g,'_');
if (argvCanon.has(canon(stdinKey))) throw new Error('normalized conflict');

When it happens

Trigger: `--agent-group x` on argv plus {"agent_group": ...} in stdin JSON — same canonical key, different spelling.

Common situations: Mixing snake_case JSON keys with kebab-case flags for the same option.

Related errors

• --stdin-json key "${key}" is also supplied on argv
• --stdin-json keys "${priorStdinKey}" and "${key}" conflict a
• --stdin-json input exceeds ${MAX_STDIN_JSON_BYTES} bytes
• --stdin-json input is empty
• --stdin-json input is not valid JSON

AI-assisted analysis of nanocoai/nanoclaw@294ef2aee8 (2026-08-28). Data as JSON: /api/errors/53e715d4797a42d1. Report an issue: GitHub.