Codex Implement Skill

Delegate complex implementation tasks to the Codex agent for high-quality code.

When to Use

• Complex multi-file implementations
• Algorithms requiring careful design
• User explicitly wants Codex to implement

Steps

Before any file operations, resolve the

.agent-collab

directory so commands work outside the project root:

AGENT_COLLAB_DIR="${AGENT_COLLAB_DIR:-}"
if [ -n "$AGENT_COLLAB_DIR" ]; then
  if [ -d "$AGENT_COLLAB_DIR/.agent-collab" ]; then
    AGENT_COLLAB_DIR="$AGENT_COLLAB_DIR/.agent-collab"
  elif [ ! -d "$AGENT_COLLAB_DIR" ]; then
    AGENT_COLLAB_DIR=""
  fi
fi

if [ -z "$AGENT_COLLAB_DIR" ]; then
  AGENT_COLLAB_DIR="$(pwd)"
  while [ "$AGENT_COLLAB_DIR" != "/" ] && [ ! -d "$AGENT_COLLAB_DIR/.agent-collab" ]; do
    AGENT_COLLAB_DIR="$(dirname "$AGENT_COLLAB_DIR")"
  done
  AGENT_COLLAB_DIR="$AGENT_COLLAB_DIR/.agent-collab"
fi

If

$AGENT_COLLAB_DIR

does not exist, stop and ask for the project root.

1. Gather Requirements

From user, collect:

• What needs implementing
• Target file paths
• Constraints and patterns to follow
• Dependencies and interfaces

2. Create Implementation Spec

Write to

$AGENT_COLLAB_DIR/requests/task.md

:

# Task Request for Codex

## Task Type: IMPLEMENT

## Timestamp
[Current timestamp]

## Implementation Request
[Detailed description]

## Target Files
- Primary: [main file path]
- Secondary: [supporting files]

## Requirements
1. [Requirement 1]
2. [Requirement 2]
...

## Interfaces & Contracts
[Interfaces the code must satisfy]

## Existing Code Context
[Relevant existing code to integrate with]

## Patterns to Follow
[Reference existing patterns]

## Constraints
- [List constraints]

3. Update Status

Write

pending

to

$AGENT_COLLAB_DIR/status

4. Trigger Codex

tmux send-keys -t 1 '$read-task' && sleep 0.5 && tmux send-keys -t 1 Enter Enter

5. Notify User

Tell user briefly that implementation was delegated to Codex.

6. Wait for Codex (Background Polling)

Start a background polling loop to wait for Codex to complete. Run this EXACT bash command (with

$AGENT_COLLAB_DIR/status

) using the Bash tool with

run_in_background: true

:

while [ "$(cat "$AGENT_COLLAB_DIR/status")" != "done" ]; do sleep 5; done; echo "CODEX_COMPLETE"

Note: Use 5 second intervals since implementations take longer.

CRITICAL: Use the resolved

$AGENT_COLLAB_DIR/status

path so polling works outside the project root. Use background execution so you can continue helping the user while waiting.

7. Auto-Read Response

When poll completes, automatically:

1. Read

   $AGENT_COLLAB_DIR/responses/response.md

2. Present the implementation to user
3. Ask if user wants to integrate the code
4. Reset

   $AGENT_COLLAB_DIR/status

   to

   idle