| 1 | package tool |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "strings" |
| 7 | ) |
| 8 | |
| 9 | // ContextualAvailabilityReason optionally explains a failed ContextualTool |
| 10 | // check. Implementations must be observational and return no private data. |
| 11 | type ContextualAvailabilityReason interface { |
| 12 | UnavailableReason(context.Context) string |
| 13 | } |
| 14 | |
| 15 | // ContextualUnavailableReason is shared by discovery and the execution gate. |
| 16 | // It does not change registry membership or provider-visible tool schemas. |
| 17 | func ContextualUnavailableReason(ctx context.Context, target Tool) string { |
| 18 | contextual, ok := target.(ContextualTool) |
| 19 | if !ok || contextual.ProviderVisible(ctx) { |
| 20 | return "" |
| 21 | } |
| 22 | if diagnostic, ok := target.(ContextualAvailabilityReason); ok { |
| 23 | if reason := strings.TrimSpace(diagnostic.UnavailableReason(ctx)); reason != "" { |
| 24 | return strings.TrimPrefix(reason, "blocked: ") |
| 25 | } |
| 26 | } |
| 27 | return fmt.Sprintf("tool %q is unavailable in the current workflow context", target.Name()) |
| 28 | } |
| 29 |