openai/codex · error · AmendError

prefix rule requires at least one token

Error message

prefix rule requires at least one token

What it means

Error "prefix rule requires at least one token" thrown in openai/codex.

Source

Thrown at codex-rs/execpolicy/src/amend.rs:16

use std::fs::OpenOptions;
use std::io::Read;
use std::io::Seek;
use std::io::SeekFrom;
use std::io::Write;
use std::path::Path;
use std::path::PathBuf;

use crate::decision::Decision;
use crate::rule::NetworkRuleProtocol;
use crate::rule::normalize_network_rule_host;
use thiserror::Error;

#[derive(Debug, Error)]
pub enum AmendError {
    #[error("prefix rule requires at least one token")]
    EmptyPrefix,
    #[error("invalid network rule: {0}")]
    InvalidNetworkRule(String),
    #[error("policy path has no parent: {path}")]
    MissingParent { path: PathBuf },
    #[error("failed to create policy directory {dir}: {source}")]
    CreatePolicyDir {
        dir: PathBuf,
        source: std::io::Error,
    },
    #[error("failed to format prefix tokens: {source}")]
    SerializePrefix { source: serde_json::Error },
    #[error("failed to serialize network rule field: {source}")]
    SerializeNetworkRule { source: serde_json::Error },
    #[error("failed to open policy file {path}: {source}")]
    OpenPolicyFile {
        path: PathBuf,
        source: std::io::Error,

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/execpolicy/src/amend.rs:16 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/c6e199c996f75d6e. Report an issue: GitHub.