feat: TrueFoundry resilience pivot — three fault-injection demo scenarios

Makefile

@@ -1,7 +1,10 @@
-.PHONY: demo
+.PHONY: demo demo-resilience
 
 demo:
 	EVAL_COMPOSE_FILE=deploy/docker-compose.yml \
 	POSTGRES_DSN=postgres://gateway:gateway@127.0.0.1:15432/gateway?sslmode=disable \
 	AGENT_URL=http://127.0.0.1:18085 \
 	go run ./cmd/eval-runner evalsuite/default.yaml
+
+demo-resilience:
+	@bash scripts/demo-resilience.sh

cmd/eval-runner/main.go

@@ -44,8 +44,22 @@ type evalRunnerDeps struct {
 }
 
 func main() {
+	args := os.Args[1:]
+
+	if len(args) > 0 && args[0] == "--serve" {
+		suitePath := defaultSuitePath
+		if len(args) > 1 {
+			suitePath = args[1]
+		}
+		if err := serve(suitePath); err != nil {
+			_, _ = fmt.Fprintln(os.Stderr, err.Error())
+			os.Exit(1)
+		}
+		return
+	}
+
 	os.Exit(run(evalRunnerDeps{
-		args:       os.Args[1:],
+		args:       args,
 		stdout:     os.Stdout,
 		stderr:     os.Stderr,
 		lookPath:   exec.LookPath,

cmd/eval-runner/serve.go

@@ -0,0 +1,170 @@
+package main
+
+import (
+	"context"
+	_ "embed"
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"os"
+	"strings"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+//go:embed ui.html
+var uiHTML []byte
+
+type evalResponse struct {
+	Passed     bool         `json:"passed"`
+	PassCount  int          `json:"pass_count"`
+	TotalCount int          `json:"total_count"`
+	Cases      []CaseResult `json:"cases"`
+	Report     string       `json:"report"`
+}
+
+func serve(suitePath string) error {
+	cfg, err := LoadConfig()
+	if err != nil {
+		return err
+	}
+
+	suite, err := LoadSuite(suitePath)
+	if err != nil {
+		return fmt.Errorf("load suite: %w", err)
+	}
+
+	ctx := context.Background()
+	db, err := openPostgresPool(ctx, cfg.PostgresDSN)
+	if err != nil {
+		return fmt.Errorf("connect to postgres: %w", err)
+	}
+	defer db.Close()
+
+	pool, ok := db.(*pgxpool.Pool)
+	if !ok {
+		return fmt.Errorf("database connection is not a *pgxpool.Pool")
+	}
+	runner := NewCaseRunner(cfg.AgentURL, pool)
+
+	// AI agent runner — optional, only active when AI_AGENT_URL is set
+	aiAgentURL := os.Getenv("AI_AGENT_URL")
+	var aiRunner caseExecutor
+	var aiSuite *EvalSuite
+	if aiAgentURL != "" {
+		aiRunner = NewCaseRunner(aiAgentURL, pool)
+		aiSuitePath := os.Getenv("AI_SUITE_PATH")
+		if aiSuitePath == "" {
+			aiSuitePath = "evalsuite/ai-agent.yaml"
+		}
+		aiSuite, err = LoadSuite(aiSuitePath)
+		if err != nil {
+			return fmt.Errorf("load AI suite: %w", err)
+		}
+	}
+
+	port := os.Getenv("EVAL_SERVE_PORT")
+	if port == "" {
+		port = "8099"
+	}
+
+	http.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		_, _ = w.Write(uiHTML)
+	})
+
+	http.HandleFunc("POST /run-eval", makeEvalHandler(runner, suite, pool))
+
+	http.HandleFunc("POST /run-eval/ai", func(w http.ResponseWriter, r *http.Request) {
+		if aiRunner == nil {
+			http.Error(w, `{"error":"AI_AGENT_URL not configured"}`, http.StatusServiceUnavailable)
+			return
+		}
+		makeEvalHandler(aiRunner, aiSuite, pool)(w, r)
+	})
+
+	http.HandleFunc("POST /run-eval/custom", makeCustomEvalHandler(pool))
+
+	http.HandleFunc("GET /healthz", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	})
+
+	slog.Info("eval server listening", "port", port)
+	return http.ListenAndServe(":"+port, nil)
+}
+
+func makeCustomEvalHandler(pool *pgxpool.Pool) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var body struct {
+			Suite    string `json:"suite"`
+			AgentURL string `json:"agent_url"`
+		}
+		if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
+			http.Error(w, fmt.Sprintf("invalid request: %v", err), http.StatusBadRequest)
+			return
+		}
+		if body.AgentURL == "" {
+			http.Error(w, "missing agent_url", http.StatusBadRequest)
+			return
+		}
+		if body.Suite == "" {
+			http.Error(w, "missing suite", http.StatusBadRequest)
+			return
+		}
+
+		suite, err := LoadSuiteFromReader(strings.NewReader(body.Suite))
+		if err != nil {
+			http.Error(w, fmt.Sprintf("invalid suite: %v", err), http.StatusBadRequest)
+			return
+		}
+
+		runner := NewCaseRunner(body.AgentURL, pool)
+		makeEvalHandler(runner, suite, pool)(w, r)
+	}
+}
+
+func makeEvalHandler(runner caseExecutor, suite *EvalSuite, _ *pgxpool.Pool) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		results := make([]CaseResult, 0, len(suite.Cases))
+		for _, testCase := range suite.Cases {
+			trace, err := runner.Run(r.Context(), testCase)
+			result := CaseResult{Name: testCase.Name}
+			if err != nil {
+				result.Failures = []CheckFailure{{
+					Check:    "run",
+					Expected: "case completes successfully",
+					Observed: err.Error(),
+				}}
+			} else {
+				result = Evaluate(testCase, trace)
+			}
+			results = append(results, result)
+		}
+
+		passCount := 0
+		for _, r := range results {
+			if r.Passed {
+				passCount++
+			}
+		}
+
+		report := GenerateReport(results)
+
+		if r.Header.Get("Accept") == "application/json" {
+			resp := evalResponse{
+				Passed:     passCount == len(results),
+				PassCount:  passCount,
+				TotalCount: len(results),
+				Cases:      results,
+				Report:     report,
+			}
+			w.Header().Set("Content-Type", "application/json")
+			_ = json.NewEncoder(w).Encode(resp)
+			return
+		}
+
+		w.Header().Set("Content-Type", "text/plain")
+		_, _ = fmt.Fprint(w, report)
+	}
+}

cmd/eval-runner/suite.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"io"
 	"os"
 
 	"gopkg.in/yaml.v3"
@@ -12,6 +13,7 @@ var allowedPolicyOutcomes = map[string]struct{}{
 	"deny":             {},
 	"approvalRequired": {},
 	"expired":          {},
+	"upstream_error":   {},
 }
 
 func LoadSuite(path string) (*EvalSuite, error) {
@@ -21,10 +23,18 @@ func LoadSuite(path string) (*EvalSuite, error) {
 	}
 	defer func() { _ = file.Close() }()
 
-	var suite EvalSuite
-	if err := yaml.NewDecoder(file).Decode(&suite); err != nil {
+	suite, err := LoadSuiteFromReader(file)
+	if err != nil {
 		return nil, fmt.Errorf("parse eval suite %q: %w", path, err)
 	}
+	return suite, nil
+}
+
+func LoadSuiteFromReader(r io.Reader) (*EvalSuite, error) {
+	var suite EvalSuite
+	if err := yaml.NewDecoder(r).Decode(&suite); err != nil {
+		return nil, fmt.Errorf("parse eval suite: %w", err)
+	}
 
 	for i, evalCase := range suite.Cases {
 		if evalCase.Name == "" {

cmd/eval-runner/suite_test.go

@@ -212,6 +212,25 @@ func TestLoadSuiteLoadsRepoDefaultFixtureFromRepoRoot(t *testing.T) {
 	}
 }
 
+func TestLoadSuiteAcceptsUpstreamErrorPolicyOutcome(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "suite.yaml")
+	writeTestFile(t, path, `
+cases:
+  - name: mcp-down
+    input: "Show me my recent charges."
+    mustInclude: [list_recent_charges]
+    policyOutcome: upstream_error
+`)
+	suite, err := LoadSuite(path)
+	if err != nil {
+		t.Fatalf("LoadSuite() error = %v, want nil", err)
+	}
+	if suite.Cases[0].PolicyOutcome != "upstream_error" {
+		t.Fatalf("PolicyOutcome = %q, want upstream_error", suite.Cases[0].PolicyOutcome)
+	}
+}
+
 func writeTestFile(t *testing.T, path string, contents string) {
 	t.Helper()
 	if err := os.WriteFile(path, []byte(strings.TrimLeft(contents, "\n")), 0o600); err != nil {

cmd/eval-runner/types.go

@@ -22,13 +22,13 @@ type TraceRow struct {
 }
 
 type CheckFailure struct {
-	Check    string
-	Expected string
-	Observed string
+	Check    string `json:"check"`
+	Expected string `json:"expected"`
+	Observed string `json:"observed"`
 }
 
 type CaseResult struct {
-	Name     string
-	Passed   bool
-	Failures []CheckFailure
+	Name     string         `json:"name"`
+	Passed   bool           `json:"passed"`
+	Failures []CheckFailure `json:"failures"`
 }