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Add new functionality in Codex by mapping existing architecture first, then implementing the smallest compatible change and verifying behavior with focused checks.
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| name | add-feature |
| description | Add new functionality in Codex by mapping existing architecture first, then implementing the smallest compatible change and verifying behavior with focused checks. |
| compatibility | Codex CLI with terminal access, Node.js >=18, git, tokenlean CLI (npm i -g tokenlean) |
Add functionality by understanding existing code paths before editing.
Locate -> Understand -> Implement -> Integrate -> Verify
tl parallel "tl structure" "tl entry"
Find where similar behavior already exists and which files most likely own the feature.
tl parallel \
"symbols=tl symbols <target-file>" \
"deps=tl deps <target-file>" \
"exports=tl exports <target-file>"
tl snippet <function> <file> # Read specific functions, not whole files
bin/tl-*.mjs.tl parallel "impact=tl impact <changed-file>" "guard=tl guard"
Check:
tl parallel "test=tl run 'npm test'" "help=tl run 'node bin/<changed-tool>.mjs --help'"
Use narrower checks first when possible (single test file or targeted command), then broader checks.
Find duplicate functions and eliminate them so they stay gone. Triage tl dupes output by tier, apply the right consolidation pattern, and lock the win with a duplication-ratchet test. Use when asked to dedupe, remove duplication, consolidate copy-paste, clean up repeated helpers, or act on tl dupes output.
Find duplicate functions in Codex and remove them so they stay gone — triage tl dupes by tier, consolidate the second home (not both copies), and add a duplication-ratchet test to block regressions. Use when deduping, removing copy-paste, consolidating repeated helpers, or acting on tl dupes output.
Git commits, pushes, and GitHub operations using tokenlean. Covers tl push (with multi-file safety guard), tl commit-prep, tl gh (bulk issue/PR/release operations), and when to use tl gh vs gh CLI vs GitHub MCP. Use when committing, pushing, creating/closing/viewing issues, managing PRs, creating releases, or any git/GitHub workflow.
Git commits, pushes, and GitHub operations using tokenlean. Covers tl push (with multi-file safety guard), tl commit-prep, tl gh (bulk issue/PR/release operations). Use when committing, pushing, creating/closing/viewing issues, managing PRs, creating releases, or any git/GitHub workflow.
Add new functionality by understanding existing patterns and dependencies before writing code. Locates where the feature belongs, studies conventions, implements following precedent, then verifies integration. Use when asked to add a feature, flag, endpoint, component, or module.
Thorough code review using token-efficient context gathering. Analyzes PRs, diffs, or staged changes by checking blast radius, complexity, and dependencies before reviewing the actual code. Use when asked to review a PR, review changes, or do a code review.