feat(auth): add SATP agent trust verification provider

docs/docs-package/satp-agent-trust.md

@@ -0,0 +1,117 @@
+# SATP Agent Trust Verification
+
+Verify agent identity and behavioral trust scores using [AgentFolio/SATP](https://github.com/brainAI-bot/satp-solana-sdk) (Solana Agent Trust Protocol).
+
+## Overview
+
+The `SATPProvider` is an auth provider that checks an agent's on-chain trust score before allowing tool execution. It answers: **"Should I trust this agent for this task?"**
+
+## Quick Start
+
+```typescript
+import { MCPServer, SATPProvider } from "mcp-framework";
+
+const server = new MCPServer({
+  auth: {
+    provider: new SATPProvider({
+      minTrustScore: 50,
+      onMissing: "allow", // Don't break unidentified agents
+    }),
+  },
+});
+```
+
+No API keys needed — the AgentFolio API is public.
+
+## Configuration
+
+| Option | Type | Default | Description |
+|--------|------|---------|-------------|
+| `apiUrl` | `string` | `"https://api.agentfolio.bot"` | AgentFolio API base URL |
+| `minTrustScore` | `number` | `0` | Minimum trust score (0-100) to allow access |
+| `requireVerified` | `boolean` | `false` | Require on-chain verification |
+| `agentIdHeader` | `string` | `"x-agent-id"` | Header name for agent identity |
+| `onMissing` | `"allow" \| "reject"` | `"allow"` | Behavior when agent identity is missing |
+| `cacheTtlMs` | `number` | `300000` | Cache TTL in ms (default 5 min) |
+
+## How It Works
+
+1. Agent sends request with `x-agent-id` header (or `Authorization: Agent <id>`)
+2. Provider queries AgentFolio for the agent's trust data
+3. If trust score meets threshold → request proceeds with trust data attached
+4. If below threshold → request rejected with `403` and `X-Trust-Required` header
+
+## Modes
+
+### Annotation mode (default)
+```typescript
+new SATPProvider({ onMissing: "allow", minTrustScore: 0 })
+```
+All requests pass through. Trust data is attached to `AuthResult.data.agentTrust` for your tool handlers to use (or ignore).
+
+### Enforcement mode
+```typescript
+new SATPProvider({ 
+  minTrustScore: 50,
+  requireVerified: true,
+  onMissing: "reject" 
+})
+```
+Only verified agents with trust score ≥ 50 can access tools. Unidentified requests are rejected.
+
+### Graduated trust
+```typescript
+// In your tool handler, use the trust data for risk-based decisions
+const trust = request.context?.agentTrust;
+
+if (trust?.trustScore > 80) {
+  // High trust: allow sensitive operations
+} else if (trust?.trustScore > 30) {
+  // Medium trust: allow read-only operations
+} else {
+  // Low/no trust: sandbox mode
+}
+```
+
+## Testing
+
+```bash
+# Test with a verified agent
+curl -H "x-agent-id: brainGrowth" http://localhost:3000/mcp
+
+# Test without identity (annotation mode passes through)
+curl http://localhost:3000/mcp
+```
+
+## Trust Data Shape
+
+```typescript
+interface AgentTrustResult {
+  agentId: string;       // Agent identifier
+  trustScore: number;    // 0-100
+  verified: boolean;     // On-chain verification status
+  name?: string;         // Display name
+  capabilities?: string[]; // Capability tags
+  lastVerified?: string; // ISO timestamp
+}
+```
+
+## Composing with Other Providers
+
+SATPProvider works alongside JWT, OAuth, or API key providers. Use it as a secondary check after authentication:
+
+```typescript
+// Your custom composed provider
+class ComposedProvider implements AuthProvider {
+  private jwt = new JWTProvider(jwtConfig);
+  private satp = new SATPProvider({ minTrustScore: 30 });
+
+  async authenticate(req: IncomingMessage) {
+    const jwtResult = await this.jwt.authenticate(req);
+    if (!jwtResult) return false;
+
+    const satpResult = await this.satp.authenticate(req);
+    return satpResult; // Trust data in result.data.agentTrust
+  }
+}
+```

src/auth/index.ts

@@ -2,6 +2,7 @@ export * from "./types.js";
 export * from "./providers/jwt.js";
 export * from "./providers/apikey.js";
 export * from "./providers/oauth.js";
+export * from "./providers/satp.js";
 
 export type { AuthProvider, AuthConfig, AuthResult } from "./types.js";
 export type { JWTConfig } from "./providers/jwt.js";

src/auth/providers/satp.ts

@@ -0,0 +1,216 @@
+import { IncomingMessage } from "node:http";
+import { AuthProvider, AuthResult, DEFAULT_AUTH_ERROR } from "../types.js";
+
+/**
+ * Trust verification result from SATP/AgentFolio
+ */
+export interface AgentTrustResult {
+  /** Agent identifier */
+  agentId: string;
+  /** Trust score (0-100) */
+  trustScore: number;
+  /** Whether the agent is verified on-chain */
+  verified: boolean;
+  /** Agent display name */
+  name?: string;
+  /** Capabilities tags */
+  capabilities?: string[];
+  /** Last verification timestamp */
+  lastVerified?: string;
+}
+
+/**
+ * Configuration for SATP agent trust verification
+ */
+export interface SATPConfig {
+  /**
+   * AgentFolio API base URL
+   * @default "https://api.agentfolio.bot"
+   */
+  apiUrl?: string;
+
+  /**
+   * Minimum trust score required (0-100)
+   * Set to 0 to allow all agents but still annotate requests with trust data
+   * @default 0
+   */
+  minTrustScore?: number;
+
+  /**
+   * Require on-chain verification
+   * @default false
+   */
+  requireVerified?: boolean;
+
+  /**
+   * Header name for agent identity
+   * @default "x-agent-id"
+   */
+  agentIdHeader?: string;
+
+  /**
+   * Behavior when agent identity is missing from request
+   * - "reject": Return 401
+   * - "allow": Continue without trust data
+   * @default "allow"
+   */
+  onMissing?: "reject" | "allow";
+
+  /**
+   * Cache TTL in milliseconds for trust score lookups
+   * @default 300000 (5 minutes)
+   */
+  cacheTtlMs?: number;
+}
+
+/**
+ * SATP Agent Trust Provider
+ *
+ * Verifies agent identity and trust scores via AgentFolio/SATP.
+ * Can be used standalone or composed with other auth providers.
+ *
+ * @example
+ * ```typescript
+ * import { MCPServer, SATPProvider } from "mcp-framework";
+ *
+ * const server = new MCPServer({
+ *   auth: {
+ *     provider: new SATPProvider({
+ *       minTrustScore: 50,
+ *       requireVerified: true,
+ *     }),
+ *   },
+ * });
+ * ```
+ */
+export class SATPProvider implements AuthProvider {
+  private config: Required<SATPConfig>;
+  private cache: Map<string, { result: AgentTrustResult; expiry: number }> =
+    new Map();
+
+  constructor(config: SATPConfig = {}) {
+    this.config = {
+      apiUrl: config.apiUrl ?? "https://api.agentfolio.bot",
+      minTrustScore: config.minTrustScore ?? 0,
+      requireVerified: config.requireVerified ?? false,
+      agentIdHeader: config.agentIdHeader ?? "x-agent-id",
+      onMissing: config.onMissing ?? "allow",
+      cacheTtlMs: config.cacheTtlMs ?? 300_000,
+    };
+  }
+
+  async authenticate(req: IncomingMessage): Promise<boolean | AuthResult> {
+    const agentId = this.extractAgentId(req);
+
+    if (!agentId) {
+      return this.config.onMissing === "allow" ? { data: { agentTrust: null } } : false;
+    }
+
+    const trust = await this.queryTrust(agentId);
+
+    if (!trust) {
+      return this.config.onMissing === "allow" ? { data: { agentTrust: null } } : false;
+    }
+
+    // Check minimum trust score
+    if (trust.trustScore < this.config.minTrustScore) {
+      return false;
+    }
+
+    // Check verification requirement
+    if (this.config.requireVerified && !trust.verified) {
+      return false;
+    }
+
+    return {
+      data: {
+        agentTrust: trust,
+      },
+    };
+  }
+
+  getAuthError(): { status: number; message: string; headers?: Record<string, string> } {
+    return {
+      status: 403,
+      message: "Agent trust verification failed",
+      headers: {
+        "X-Trust-Required": `min-score=${this.config.minTrustScore}`,
+      },
+    };
+  }
+
+  /**
+   * Extract agent ID from request headers or MCP metadata
+   */
+  private extractAgentId(req: IncomingMessage): string | null {
+    // Check custom header first
+    const headerValue = req.headers[this.config.agentIdHeader];
+    if (headerValue) {
+      return Array.isArray(headerValue) ? headerValue[0] : headerValue;
+    }
+
+    // Check Authorization header for agent token
+    const auth = req.headers.authorization;
+    if (auth?.startsWith("Agent ")) {
+      return auth.slice(6).trim();
+    }
+
+    return null;
+  }
+
+  /**
+   * Query AgentFolio API for agent trust data with caching
+   */
+  private async queryTrust(agentId: string): Promise<AgentTrustResult | null> {
+    // Check cache
+    const cached = this.cache.get(agentId);
+    if (cached && cached.expiry > Date.now()) {
+      return cached.result;
+    }
+
+    try {
+      const response = await fetch(
+        `${this.config.apiUrl}/v1/agents/${encodeURIComponent(agentId)}/trust`,
+        {
+          method: "GET",
+          headers: {
+            Accept: "application/json",
+            "User-Agent": "mcp-framework-satp/1.0",
+          },
+          signal: AbortSignal.timeout(5000),
+        }
+      );
+
+      if (!response.ok) {
+        return null;
+      }
+
+      const data = (await response.json()) as AgentTrustResult;
+      const result: AgentTrustResult = {
+        agentId: data.agentId ?? agentId,
+        trustScore: data.trustScore ?? 0,
+        verified: data.verified ?? false,
+        name: data.name,
+        capabilities: data.capabilities,
+        lastVerified: data.lastVerified,
+      };
+
+      // Cache result
+      this.cache.set(agentId, {
+        result,
+        expiry: Date.now() + this.config.cacheTtlMs,
+      });
+
+      return result;
+    } catch {
+      return null;
+    }
+  }
+
+  /**
+   * Clear the trust score cache
+   */
+  clearCache(): void {
+    this.cache.clear();
+  }
+}