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Chord

Codex + LSP

Use this setup when you want:

  • OAuth with preset: codex
  • Go and Python LSP support
  • an extra read-only reviewer agent

~/.config/chord/config.yaml

providers:
  codex:
    preset: codex
    type: responses
    models:
      gpt-5.5:
        limit:
          context: 400000
          input: 272000
          output: 128000
        reasoning:
          summary: auto
        text:
          verbosity: medium
        variants:
          high:
            reasoning:
              effort: high
          xhigh:
            reasoning:
              effort: xhigh
        modalities:
          input: [text, image]


  fast:
    type: chat-completions
    api_url: https://api.openai.com/v1/chat/completions
    models:
      gpt-5.4-mini:
        limit:
          context: 200000
          input: 183616
          output: 128000


model_pools:
  thinking:
    - codex/gpt-5.5@high
    - codex/gpt-5.5
  fast:
    - fast/gpt-5.4-mini


lsp:
  gopls:
    command: gopls
    file_types: [".go"]
    root_markers: ["go.work", "go.mod", ".git"]
  pyright:
    command: pyright-langserver
    args: ["--stdio"]
    file_types: [".py", ".pyi"]
    options:
      python.analysis:
        typeCheckingMode: standard


context:
  compact_threshold: 0.8
  compaction:
    model_pool: fast
    reserved: 16000


desktop_notification: true
prevent_sleep: true
ime_switch_target: com.apple.keylayout.ABC
log_level: info

~/.config/chord/auth.yaml

Codex OAuth credentials are usually written by chord auth codex, so you do not normally hand-edit them. They are stored under the active provider name, so with the config above auth.yaml typically contains entries like:

codex:
  - refresh: "..."
    access: "..."
    expires: 1774009702606
    account_id: acc-1

~/.config/chord/agents/reviewer.md

---
name: "reviewer"
description: "Read-only code reviewer"
mode: "subagent"
model_pools:
  - thinking
permission:
  "*": deny
  Read: allow
  Grep: allow
  Glob: allow
  Shell:
    "*": allow
    "rm *": deny
    "mv *": deny
    "git add *": deny
    "git commit *": deny
    "git push *": deny
    "sudo *": deny
---
## Role


- Review recent code changes for correctness, risk, and missing verification.
- Stay read-only; do not modify project files.

Two practical points matter here:

  • Most models only need limit.context: keep total input + output within that window.
  • Some GPT models also have a separate input cap. Set limit.input for those models so Chord knows when to compact before the prompt is too large; otherwise it derives the input budget from limit.context minus effective requested output.
  • limit.output is the model’s own output capacity. Chord still defaults max_output_tokens to 32000, so actual requests use the smaller output limit; changing that request cap does not increase the provider’s 272k input cap.
  • Same-named models on different providers are still tried independently in the fallback chain; Chord does not skip them just because the model name matches.