Agent Deck session opener

This skill verifies an MCP connection; it does not create one. In Codex, the Agent Deck plugin's .mcp.json must already have launched agent-deck mcp-launch. The launcher reads the folder's v3 assignment and sends the deck/workspace headers before these tools exist.

When Agent Deck MCP is configured for the current session, or .agent-deck/use.json indicates that it is expected, this opener is a hard gate. The file is only one optional signal; the gate also includes launch-selected sessions that deliberately have no assignment file. Complete the opener before reading repository files, running task commands, or answering the task. Once per conversation (or after the selected deck changes):

1. get_session_context — one call returns the workspace, effective deck, display_summary, services, credential metadata, and playbook summaries
2. Show the session binding as exactly one transcript line rendering display_summary verbatim (e.g. ◆ dev · 2 MCP · 0 keys · 1 playbooks). display_summary is the one source string for this canonical session receipt: do not reconstruct the deck name, counts, badge, or the session (default …) override suffix — print the suffix exactly as returned when the session deck differs from the workspace default. This transcript receipt is the authoritative binding record for the session; workspace badges and terminal status lines are optional secondary context and never override it.
3. Match the task against the returned playbook triggers. For every match, use the agent-deck-playbooks skill and call get_playbook before taking task action.

If the Agent Deck tools are unavailable, disconnected, return GRANT_REQUIRED, or the required call fails, stop and report the connection problem. Do not inspect the repository, improvise from memory, or silently fall back to another route. Before the gate passes, checking for the optional assignment signal, checking whether Agent Deck is configured, and other read-only diagnostics needed to restore the connection are allowed.

Give the operator recovery for the failed layer:

• Transport unavailable: run agent-deck status. In Codex, verify the Agent Deck plugin is installed, enabled, and current, then reload or start a new task so its .mcp.json launches agent-deck mcp-launch. agent-deck setup --client codex installs or refreshes the AGENTS.md guidance only; it does not install or repair the plugin transport.
• Assignment missing or legacy: run agent-deck use <deck> in the IDE folder, then reload or retry the MCP connection.
• Unattended launch: fix x-agent-deck-deck-id / the launch configuration.

Do not repeat the receipt on later turns when the binding is unchanged. A confirmed binding change allows exactly one new receipt line.