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feat(mcp): return logs as pre-formatted strings to reduce token usage #145

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Merged
AdrianLC merged 2 commits into from
Apr 13, 2026
+9 −15
Merged

feat(mcp): return logs as pre-formatted strings to reduce token usage #145

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9845fea
feat(mcp): return logs as pre-formatted strings to reduce token usage
AdrianLC Apr 9, 2026
31bad04
fix(logs): align timestamp format with PostgreSQL style
AdrianLC Apr 10, 2026
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3 changes: 2 additions & 1 deletion internal/tiger/cmd/service.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1595,7 +1595,8 @@ Examples:
for _, entry := range logs {
line := entry.Message
if !entry.Timestamp.IsZero() {
line = entry.Timestamp.UTC().Format("2006-01-02 15:04:05 UTC") + " " + line
// Local timezone for terminal output; MCP and public API use UTC.
line = entry.Timestamp.Local().Format("2006-01-02 15:04:05 MST") + " " + line
}
fmt.Fprintln(outputWriter, colorizeLogEntry(line, entry.Severity, shouldColorize))
}
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21 changes: 7 additions & 14 deletions internal/tiger/mcp/service_tools.go
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Original file line number Diff line number Diff line change
Expand Up @@ -395,14 +395,7 @@ func (ServiceLogsInput) Schema() *jsonschema.Schema {

// ServiceLogsOutput represents output for service_logs
type ServiceLogsOutput struct {
Entries []serviceLogEntryOutput `json:"entries" jsonschema:"Structured log entries with timestamp, message, and severity, ordered from oldest to newest"`
}

// serviceLogEntryOutput is the MCP output shape for a single log entry.
type serviceLogEntryOutput struct {
Timestamp time.Time `json:"timestamp"`
Message string `json:"message"`
Severity string `json:"severity"`
Logs []string `json:"logs" jsonschema:"Log lines ordered from oldest to newest. Each line is prefixed with an RFC3339 timestamp followed by the log message."`
}

func (ServiceLogsOutput) Schema() *jsonschema.Schema {
Expand Down Expand Up @@ -1184,14 +1177,14 @@ func (s *Server) handleServiceLogs(ctx context.Context, req *mcp.CallToolRequest
return nil, ServiceLogsOutput{}, err
}

structured := make([]serviceLogEntryOutput, len(entries))
logs := make([]string, len(entries))
for i, e := range entries {
structured[i] = serviceLogEntryOutput{
Timestamp: e.Timestamp,
Message: e.Message,
Severity: e.Severity,
if !e.Timestamp.IsZero() {
logs[i] = e.Timestamp.UTC().Format("2006-01-02 15:04:05 UTC") + " " + e.Message
} else {
logs[i] = e.Message
}
}

return nil, ServiceLogsOutput{Entries: structured}, nil
return nil, ServiceLogsOutput{Logs: logs}, nil
}
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