v0.9.3: Hardening — 6 P0 fixes, SSRF guard, streaming budget, error redaction

What's new

Hardening release closing all 6 P0 defects from the v0.9.2 audit. 820 → 878 passing tests, no breaking API changes.

Fixed (P0)

• _totalEstimated grew monotonically forever — BudgetTracker.release() now decrements _totalEstimated alongside _totalReserved. settle() correctly preserves the estimate (it has committed to actual).
• stream() was not budget-enforced — client.stream() now reserves before the retry loop, settles on the first usage chunk, settles at end-of-stream if no usage chunk arrived, and releases on abort/throw/fallback. The v0.9.0 "Hard Budget Enforcement" headline now actually covers streams.
• ProviderRequestError echoed raw provider error bodies, leaking API keys — constructor now redacts sk-…, sk-proj-…, sk-ant-…, Bearer …, and JSON secret fields.
• No SSRF protection on baseUrl — addProvider() now validates through validateBaseUrl(). Default rejects http://; loopback is always allowed when allowInsecure: true; private network ranges require allowPrivateNetwork: true. AWS instance metadata is always blocked.
• Budget callback order was inverted — onBudgetWarning now fires before onBudgetExceeded when a single settle() crosses 100%.
• extractJson could return garbage on truncated input — fallback now scans forward looking for a balanced, JSON.parse-valid substring.

Added

• src/security/url-guard.ts with validateBaseUrl(url, opts) exported from the public API
• 58 new tests (820 → 878)
• New test files: tests/security/url-guard.test.ts (27), tests/security/ssrf-integration.test.ts (8)
• allowInsecure?: boolean field on ProviderConfig
• allowInsecureUrls?: boolean and allowPrivateNetwork?: boolean on HilbrasClientConfig
• ConfigurationError is now used at the budget-rejection paths in both stream() and complete()
• redact() exported from src/logging/logger.ts

Documentation

• README.md rewritten as a clean landing page with feature matrix and links
• New docs: docs/security.md, docs/cost-and-budget.md, docs/providers.md, docs/observability.md
• Removed: docs/STRATEGY.md, docs/EXECUTION-ENGINE-THESIS.md, old v0.1→v0.2 and v0.2→v0.3 migration files
• CHANGELOG.md updated with v0.9.3 entry
• package.json: added keywords, homepage, repository, bugs fields for npm search discoverability

Verification

• npm run build — clean
• npm test — 878/878 passing
• No breaking changes; all 820 pre-existing tests pass without modification

Risk

Low. The hardening changes are surgical and additive. The only non-additive change is the SSRF guard default behavior (http:// rejected). Ollama users get allowInsecure: true to opt back in. AWS metadata was previously reachable through misconfiguration; that path is now closed even with allowInsecure.

Follow-ups (separate PRs)

• v0.10.0-PR-1: God-file refactor (RequestPipeline extraction)
• v0.10.0-PR-2: API surface cleanup (wire sdkLogger, dead-code removal, merge two ProviderConfig types)
• v0.10.0-PR-3: Circuit-breaker scoping (per-client registry)
• v0.10.0-PR-4: SDKConfig wiring (new HilbrasClient({ sdkConfig }) actually works)
• v0.10.0-PR-5: README architecture diagram refresh

v0.9.2 — Duplicate Reservation ID Fix

v0.9.2 — Reservation Identity & Accounting Integrity Patch

🐛 Bug Fixed

Duplicate reservation IDs could silently overwrite active reservations.

Previously:

reserve("r1", 0.50)  →  Map["r1"] = 0.50, _totalReserved += 0.50
reserve("r1", 0.25)  →  Map["r1"] = 0.25, _totalReserved += 0.25
// Result: Map has 0.25, but _totalReserved = 0.75
// The 0.50 reservation is orphaned — cannot be settled or released

Now: reserve() rejects duplicate IDs, preserving accounting integrity.

🛡️ Regression Tests

11 new tests covering:

• Duplicate ID rejection (returns null)
• No modification to existing reservation amount
• No increase in totalReserved
• Release/settle after rejected duplicate
• Repeated duplicate attempts (100×)
• Duplicate IDs under concurrency (1000 calls)
• Random collision scenarios (1000 iterations, 4-ID pool)
• Reserve after settle/release frees the ID
• Client-generated IDs are verified unique

772 Tests Passing

---

Changelog: https://github.com/Hilbras/Hilbras-ai-sdk/blob/main/CHANGELOG.md

v0.9.1 — Reservation Accounting Audit

v0.9.1 — Hard Budget Enforcement Audit

🐛 Bugs Found & Fixed (3 real production bugs)

Bug	Severity	Root Cause	Fix
reserve() accepted NaN amounts	HIGH	NaN < 0 is false, bypassed guard	Added !Number.isFinite() check
settle() with negative/NaN cost corrupted totals	HIGH	No input validation on actualCost	Clamps negative/NaN to 0, Infinity to session budget
settle() with Infinity didn't exhaust budget	MEDIUM	Math.max(0, Infinity) = Infinity but isBudgetExhausted used >= which Infinity satisfies, yet Infinity wasn't clamped	Now correctly caps Infinity at session budget

🛡️ 55 Adversarial Reservation Tests

Area	Tests
Lifecycle (reserve→settle, reserve→release)	2
Double settlement/release safety	5
Settle after release / release after settle	2
Reservation ID collision	3
Negative/NaN/Infinity amounts	4
Over-settlement (actual > reserved)	3
Under-settlement with random cycles	2
Concurrent reservations (1000+ calls)	5
Floating point attacks	3
Retry accounting	2
Fallback accounting	1
Client isolation	2
Memory safety (leak prevention)	3
Security (no secrets)	2
API abuse (rapid cycles)	3
Cost report reconciliation	4
Fuzz testing (1000 scenarios)	1
Performance (100K+ ops)	2
Callback safety	2

731 Tests Passing

55 new adversarial tests added (676 → 731 total).

---

Changelog: https://github.com/Hilbras/Hilbras-ai-sdk/blob/main/CHANGELOG.md

v0.9.0 — Hard Budget Enforcement

v0.9.0 — Hard Budget Enforcement & Atomic Cost Control

💰 The Problem v0.8.x Had

v0.8.x tracked costs but had a check-then-act race under concurrency:

sessionBudget = $1.00

Request A: checks remaining = $0.60 → allowed
Request B: checks remaining = $0.60 → allowed

Both execute. Total = $1.20. Budget violated.

🔒 The v0.9.0 Solution

Atomic Reservation System — check + reserve happens synchronously in one event loop tick:

Request A: reserve $0.60 → ✅ committed $0.60
Request B: reserve $0.60 → ❌ rejected (only $0.40 available)

How It Works

const client = new HilbrasClient({
  budget: {
    sessionBudget: 1.00,
    perRequestBudget: 0.10,
  },
});

// Reservation lifecycle: RESERVE → EXECUTE → SETTLE/RELEASE
const reservation = client.cost.reserve("req_1", 0.60);
if (!reservation) throw new Error("Budget exceeded");

// After execution:
client.cost.settle("req_1", 0.45); // actual < reserved → refund $0.15

// Or on failure:
client.cost.release("req_1"); // free the reservation

Committed Cost Tracking

const report = client.costReport();
report.totalReserved;    // Pending reservations
report.committedCost;    // actual + reserved
report.remainingBudget;  // sessionBudget - committed

What's New

Feature	Description
Atomic reservation	Synchronous check+reserve (JS event loop safe)
Committed cost	actual + reserved = true spending ceiling
Reservation lifecycle	reserve → settle (actual cost) or release (failure)
Over-reservation	Actual > reserved is allowed (settles to actual)
Under-reservation	Unused budget returns to available pool
No leaked reservations	Guaranteed after terminal execution
Backward compatible	record() API still works

676 Tests Passing

36 new reservation tests covering lifecycle, concurrency, integrity, adversarial, and invariants.

---

Changelog: https://github.com/Hilbras/Hilbras-ai-sdk/blob/main/CHANGELOG.md

v0.8.1 — Cost & Budget Safety Audit

v0.8.1 — Cost & Budget Safety Audit

🐛 Bugs Found & Fixed

Bug	Severity	Fix
estimateCost() produced negative cost with negative token counts	MEDIUM	Added Math.max(0, ...) guard
BudgetTracker callbacks not wrapped in try/catch — throwing callback corrupted budget accounting	HIGH	Wrapped in try/catch (notification-only semantics)

🛡️ 74 Deep Cost Audit Tests

Area	Tests
Money correctness (NaN, Infinity, negative, floating point)	10
Budget boundary enforcement (exact limits)	8
Session budget enforcement	6
Per-request budget enforcement	4
Model pricing integrity	7
Estimated vs actual cost semantics	3
Callback safety	3
Cost report integrity	5
Client lifecycle	4
Router + cost integration	3
Security	2
Adversarial inputs	7
Determinism	2
Invariant testing	7

7 Invariants Verified

1. totalActual >= 0 for all valid inputs
2. totalActual equals sum of recorded actual costs
3. byProvider totals reconcile with totalActual
4. byPhase totals reconcile with totalActual
5. remainingBudget = sessionBudget - totalActual
6. No NaN in any report field
7. No Infinity in any report field

640 Tests Passing

74 new audit tests added (566 → 640 total).

---

Changelog: https://github.com/Hilbras/Hilbras-ai-sdk/blob/main/CHANGELOG.md

v0.8.0 — Cost-Aware Execution

v0.8.0 — Cost-Aware Execution

💰 The Problem

AI costs are unpredictable. Developers set a model and pray. OpenAI SDK and Vercel AI SDK don't provide budget enforcement or cost tracking.

🎯 The Solution

Hilbras SDK now provides automatic cost tracking with budget enforcement:

const client = new HilbrasClient({
  budget: {
    sessionBudget: 1.00,       // Max total cost for the session
    perRequestBudget: 0.10,    // Max cost per individual request
    onBudgetWarning: (report) => console.warn(`80% budget used`),
    onBudgetExceeded: (report) => console.error(`Budget exhausted`),
  },
});

// After requests — full cost visibility
const report = client.costReport();
console.log(`Total spent: $${report.totalActual}`);
console.log(`By provider:`, report.byProvider);

What's Included

• BudgetTracker — session and per-request budget enforcement
• Cost lifecycle — estimate → execute → actual tracking
• Budget callbacks — warning at 80%, exceeded at 100%
• Cost reporting — by provider, by phase, remaining budget
• Zero overhead — no cost when budget not configured
• Backward compatible — existing code works unchanged

How It Differentiates

Capability	OpenAI SDK	Vercel AI SDK	Hilbras SDK
Provider abstraction	OpenAI only	Multi-provider	Multi-provider
Model routing	None	Basic	9-dimension scoring
Structured output	Limited	Limited	Schema + auto-repair
Fallback	None	None	Automatic, policy-driven
Budget enforcement	None	None	Session + per-request
Cost tracking	None	None	Full lifecycle
Cost reporting	None	None	By provider, by phase
Execution policies	None	None	5 presets + custom
Observability	Limited	Limited	9 lifecycle events

566 Tests Passing

29 new tests covering BudgetTracker, cost enforcement, client integration, concurrency, and adversarial inputs.

---

Changelog: https://github.com/Hilbras/Hilbras-ai-sdk/blob/main/CHANGELOG.md

v0.7.1 — Execution Security & Deep Audit

v0.7.1 — Execution Security, Reliability & Deep Audit

PATCH CERTIFIED — Hardening of the v0.7.0 execution optimization layer.

🛡️ Deep Audit — 78 Adversarial Tests

Area	What was tested
Plan Consistency	plan() vs best() vs explain() produce identical results
Determinism	1,000 identical evaluations, score breakdowns, candidate ordering
Hard Constraints	needsVision, needsTools, maxCost, minContextWindow, excludeModels
Cost Security	Total cost estimates, maxFallbackCost, budget alignment
Retry/Fallback	Independent dimensions, bounded execution
Infinite Loop Defense	One model, empty registry, bounded fallback list
Fallback Safety	Respects vision, tools, cost, context constraints
Provider Failures	HTTP 400-503, network errors, timeouts
Streaming Safety	Failure before/after first chunk, maxRetries=0
Policy Isolation	Independent copies, per-request overrides
State Isolation	Separate clients, provider removal
Observability	Event ordering, requestId consistency, listener safety
Security	API keys not in errors/routing/execution plans
Prompt Injection	Malicious task strings handled safely
Plan Immutability	Mutating plan doesn't affect router
Backward Compat	Explicit provider+model still works

Finding

Circuit breaker state leaks between independent test runs — the global CircuitBreakerRegistry singleton accumulates failures across test cases. Tests now disable circuit breakers via policy when testing error paths. This is a test infrastructure concern, not a production bug.

500 Tests Passing

78 new audit tests added (422 → 500 total).

---

Changelog: https://github.com/Hilbras/Hilbras-ai-sdk/blob/main/CHANGELOG.md

v0.7.0 — Execution Optimization

v0.7.0 — Execution Optimization

🧠 Execution Plan

New plan() method returns the full execution decision:

const plan = client.plan({ task: "coding", messages, policy: { allowFallback: true } });
console.log(plan.primary.model);        // Best model
console.log(plan.estimatedTotalCost);    // Primary + retry + repair estimate
console.log(plan.fallbacks);             // Alternative models

📊 9-Dimension Scoring

Enhanced explainability with detailed score breakdown:

result.scoreBreakdown = {
  capabilityFit: 83,    taskFit: 95,     contextFit: 80,
  costEfficiency: 70,   latency: 65,     budgetAlignment: 75,
  providerPreference: 5, structuredOutputFit: 0, toolFit: 10,
  finalScore: 82.4
}

⬇️ Automatic Fallback

Policy-driven model fallback on failure:

await client.complete({
  task: "coding",
  messages,
  policy: { allowFallback: true, maxCost: 0.05 },
});

Fallback respects all constraints — capabilities, cost, budget, context.

📡 Fallback Observability

client.on("fallback.started", (event) => {
  console.log(`Falling back: ${event.originalModel} → ${event.fallbackModel}`);
});

422 Tests Passing

31 new tests covering execution plan, scoring, fallback, determinism, and adversarial inputs.

---

Changelog: https://github.com/Hilbras/Hilbras-ai-sdk/blob/main/CHANGELOG.md

v0.6.2 — Provider Contract Certification

v0.6.2 — Provider Contract & Integration Certification

🐛 Bug Fixed

OpenAI adapter complete() crash on non-JSON responses — res.json() on non-JSON body threw SyntaxError. Now gracefully returns empty string.

🔌 Provider Contract Certified

116 contract tests verify that every adapter produces consistent canonical output:

What was tested	How many tests
AIProvider contract compliance	12
Canonical response (complete)	8
Canonical response (stream)	3
complete() errors across all 6 providers	18
complete() edge cases	3
stream() errors across all 6 providers	12
Tool calling (native + text-embedded + malformed)	4
Error normalization (status, provider, body)	18
Timeout behavior (complete + stream)	12
Malformed/adversarial responses	4
Provider isolation	2
Failure injection (HTTP 400-503)	20

Provider Matrix

Provider	complete()	stream()	Tools	Errors	Timeout	Status
OpenAI	✅ PASS	✅ PASS	✅ PASS	✅ PASS	✅ PASS	✅
Anthropic	✅ PASS	✅ PASS	✅ PASS	✅ PASS	✅ PASS	✅
Google GenAI	✅ PASS	✅ PASS	—	✅ PASS	✅ PASS	✅
Azure	✅ PASS	✅ PASS	—	✅ PASS	✅ PASS	✅
Groq	✅ PASS	✅ PASS	—	✅ PASS	✅ PASS	✅
Ollama	✅ PASS	✅ PASS	—	✅ PASS	✅ PASS	✅

391 Tests Passing

116 new contract tests added (275 → 391 total).

Package Verified

• 183 files
• 93.5 kB compressed
• Zero runtime dependencies
• Clean install verified from tarball
• All subpath imports resolve

---

Changelog: https://github.com/Hilbras/Hilbras-ai-sdk/blob/main/CHANGELOG.md

v0.6.1 — Production Audit & Bug Fix

v0.6.1 — Production Audit & Bug Fix

🐛 Bug Fixed

Router crash on invalid task type — passing an unknown string as task caused:

TypeError: Cannot read properties of undefined (reading 'reasoning')

Now gracefully falls back to TASK_WEIGHTS.general.

🧪 69 Production Audit Tests

Full adversarial test suite covering every phase of the audit spec:

Phase	What was tested
Client Edge Cases	Missing provider/model, empty messages, dispose
Router Destruction	maxCost=0, exclude all, contradictory requirements
Scoring Audit	NaN/Infinity checks, bounds, hard > soft
Structured Output	Empty/null/BOM/escaped/nested JSON
Schema Safety	Throwing validators, missing safeParse
Observability	Listener errors don't break SDK
Concurrency	10 concurrent requests, state isolation
Security	API key not in errors, injection
Fuzz Testing	Extreme values, negative budgets
Policy Safety	Independent copies (no mutation)
State Isolation	Separate clients, provider removal

✅ Clean Install Verified

• Package installs from tarball ✓
• All imports resolve ✓
• Zero runtime dependencies ✓
• No test files shipped ✓

275 Tests Passing

69 new adversarial tests added (206 → 275 total).

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Changelog: https://github.com/Hilbras/Hilbras-ai-sdk/blob/main/CHANGELOG.md