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Blue detects supported agents from PATH. It keeps the configured default agent reconciled and configures another allowed, installed agent just in time when you launch it through Blue.

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Direct and governed launches

Installing shims makes the familiar agent command resolve through blue. Remove the shims to restore direct resolution.

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Managed Codex policy

The example policy pins Codex to gpt-5.6-sol, sets reasoning effort to low, and disables Fast mode. When Fast mode is disabled, the overlay also selects the default service tier.

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MCP reconciliation

Remote MCP entries are suggestions keyed by name. The CLI adds a missing enabled entry but preserves all local entries. A local name collision wins, even when its command or URL differs from the remote suggestion.

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Session hooks

Each selected compatibility interval receives a session-upload hook when the global policy contains session_upload and that interval supports the required lifecycle event. Unsupported historical intervals still reconcile other policy and report that capture is inactive. Removing the top-level block removes Blue’s managed hooks without touching unrelated hooks.