---
phase: 26-add-oauth-support-to-load-testing
verified: 2026-02-28T00:00:00Z
status: passed
score: 12/12 must-haves verified
re_verification: false
---

# Phase 26: Add OAuth Support to Load-Testing — Verification Report

**Phase Goal:** Generalize OAuthHelper into the core SDK and wire OAuth/API-key authentication into `cargo pmcp loadtest run` so VUs can target protected MCP servers
**Verified:** 2026-02-28
**Status:** PASSED
**Re-verification:** No — initial verification

---

## Goal Achievement

### Observable Truths

| #  | Truth                                                                                                              | Status     | Evidence                                                                                                           |
|----|-------------------------------------------------------------------------------------------------------------------|------------|--------------------------------------------------------------------------------------------------------------------|
| 1  | `OAuthHelper`, `OAuthConfig`, `default_cache_path`, `create_oauth_middleware` available at `pmcp::client::oauth` | VERIFIED  | `src/client/oauth.rs` exports all four; `src/client/mod.rs:35-36` gates behind `#[cfg(all(not(target_arch = "wasm32"), feature = "oauth"))]` |
| 2  | `OAuthHelper::create_middleware_chain()` returns `Arc<HttpMiddlewareChain>` using existing types                  | VERIFIED  | `oauth.rs:639-656` calls `BearerToken::new`, `OAuthClientMiddleware::new`, `HttpMiddlewareChain::new`, returns `Arc::new(chain)` |
| 3  | `create_oauth_middleware(config)` convenience function exported at module level                                   | VERIFIED  | `oauth.rs:689-692` — top-level `pub async fn create_oauth_middleware` |
| 4  | No `colored` crate in pmcp production dependency tree; all output via `tracing`                                  | VERIFIED  | `grep anyhow\|colored oauth.rs` returns nothing; `tracing::info!`, `tracing::warn!`, `tracing::debug!` used throughout; `colored` only via `mockito` dev-dep |
| 5  | Error types use `crate::error::{Error, Result}` (not `anyhow`)                                                   | VERIFIED  | `oauth.rs:35` — `use crate::error::{Error, Result};`; all fallible calls use `Error::internal(format!(...))` |
| 6  | `cargo build -p pmcp --features oauth` compiles cleanly                                                           | VERIFIED  | Build output: `Finished dev profile ... in 0.40s` (no errors, no warnings) |
| 7  | mcp-tester imports from `pmcp::client::oauth`, local `oauth.rs` deleted                                         | VERIFIED  | `crates/mcp-tester/src/lib.rs:58-59` re-exports; `src/main.rs:14` imports; `crates/mcp-tester/src/oauth.rs` does not exist |
| 8  | `cargo pmcp loadtest run --help` shows all 6 auth flags                                                          | VERIFIED  | CLI output: `--api-key`, `--oauth-client-id`, `--oauth-issuer`, `--oauth-scopes`, `--oauth-no-cache`, `--oauth-redirect-port` |
| 9  | OAuth token acquired once at startup before VUs spawn (fail-fast pattern)                                        | VERIFIED  | `run.rs:64-75` — `resolve_auth_middleware` called before `LoadTestEngine::new`; entire OAuth flow runs at startup |
| 10 | `HttpMiddlewareChain` threaded: engine -> VU loop -> McpClient -> applied in send_request                       | VERIFIED  | `engine.rs:65,107-108` field + builder; `vu.rs:145-156` param + pass to `McpClient::new`; `client.rs:263-311` two-path `send_request` with `chain.process_request()` |
| 11 | Auth type (OAuth 2.0 / API key / none) displayed before engine starts                                           | VERIFIED  | `run.rs:77-81` — `match &http_middleware_chain { Some(_) if is_oauth => ..., Some(_) => ..., None => ... }` |
| 12 | All quality gates pass: fmt, clippy -D warnings, tests across all three crates                                   | VERIFIED  | `cargo fmt --check` clean; `cargo clippy -p pmcp/mcp-tester/cargo-pmcp -- -D warnings` clean; engine, client, mcp-tester tests all pass |

**Score:** 12/12 truths verified

---

## Required Artifacts

| Artifact                                       | Expected                                            | Status     | Details                                                                                                |
|------------------------------------------------|-----------------------------------------------------|------------|--------------------------------------------------------------------------------------------------------|
| `src/client/oauth.rs`                          | OAuthHelper, OAuthConfig, default_cache_path, create_oauth_middleware | VERIFIED  | 693 lines, all four public items present and substantive |
| `src/client/mod.rs`                            | `pub mod oauth` gated behind `#[cfg(all(not(wasm32), feature = "oauth"))]` | VERIFIED  | Lines 35-36 match exactly |
| `Cargo.toml`                                   | `oauth` feature with `webbrowser`, `dirs`, `rand` optional deps | VERIFIED  | Lines 74-77 (deps) and line 143 (`oauth = ["dep:webbrowser", "dep:dirs", "dep:rand"]`) |
| `crates/mcp-tester/Cargo.toml`                 | pmcp dep with oauth feature enabled                  | VERIFIED  | Line 21: `pmcp = { ..., features = ["streamable-http", "oauth"] }` |
| `crates/mcp-tester/src/main.rs`               | Imports from `pmcp::client::oauth`                  | VERIFIED  | Line 14: `use pmcp::client::oauth::{default_cache_path, OAuthConfig, OAuthHelper};` |
| `crates/mcp-tester/src/lib.rs`                | Re-exports from `pmcp::client::oauth`               | VERIFIED  | Lines 58-59: `pub use pmcp::client::oauth; pub use pmcp::client::oauth::{OAuthConfig, OAuthHelper};` |
| `crates/mcp-tester/src/oauth.rs`              | DELETED                                             | VERIFIED  | File does not exist |
| `cargo-pmcp/Cargo.toml`                        | pmcp dep with oauth + streamable-http features       | VERIFIED  | Line 36: `pmcp = { ..., features = ["streamable-http", "oauth"] }` |
| `cargo-pmcp/src/commands/loadtest/mod.rs`      | 6 auth CLI flags on `Run` variant                    | VERIFIED  | Lines 51-72: `api_key`, `oauth_client_id`, `oauth_issuer`, `oauth_scopes`, `oauth_no_cache`, `oauth_redirect_port` |
| `cargo-pmcp/src/commands/loadtest/run.rs`      | `resolve_auth_middleware` + auth display + middleware passed to engine | VERIFIED  | Lines 64-89: resolve call, display match, engine builder |
| `cargo-pmcp/src/loadtest/client.rs`            | `http_middleware_chain` field + two-path `send_request` | VERIFIED  | Lines 42, 57, 263-311: field, constructor param, middleware path with `process_request` |
| `cargo-pmcp/src/loadtest/vu.rs`               | `http_middleware_chain` param threaded through vu_loop | VERIFIED  | Lines 145, 209, 247: param present; passed to `McpClient::new` at line 156 |
| `cargo-pmcp/src/loadtest/engine.rs`            | `with_http_middleware` builder + field passed to vu_loop | VERIFIED  | Lines 65, 77, 107-108: field, init, builder; lines 180-215: passed to all vu_loop spawns |

---

## Key Link Verification

| From                                          | To                                             | Via                             | Status     | Details                                        |
|-----------------------------------------------|------------------------------------------------|---------------------------------|------------|------------------------------------------------|
| `src/client/oauth.rs`                         | `src/client/oauth_middleware.rs`               | `BearerToken`, `OAuthClientMiddleware` | WIRED | `oauth.rs:34` imports both; `oauth.rs:647-651` uses both |
| `src/client/oauth.rs`                         | `src/client/http_middleware.rs`                | `HttpMiddlewareChain`           | WIRED     | `oauth.rs:33` imports; `oauth.rs:650-654` builds chain, returns `Arc<>` |
| `src/client/oauth.rs`                         | `src/client/auth`                              | `OidcDiscoveryClient`, `TokenExchangeClient` | WIRED | `oauth.rs:32` imports; used in `discover_metadata` and `authorization_code_flow` |
| `cargo-pmcp/src/commands/loadtest/mod.rs`     | `cargo-pmcp/src/commands/loadtest/run.rs`      | CLI flags passed to `execute_run` | WIRED   | `mod.rs:130-146` destructures all 6 auth flags and passes them all to `run::execute_run` |
| `cargo-pmcp/src/commands/loadtest/run.rs`     | `cargo-pmcp/src/loadtest/engine.rs`            | `with_http_middleware(chain)`    | WIRED     | `run.rs:89`: `engine = engine.with_http_middleware(http_middleware_chain)` |
| `cargo-pmcp/src/loadtest/engine.rs`           | `cargo-pmcp/src/loadtest/vu.rs`                | `http_middleware_chain.clone()` to `vu_loop` | WIRED | `engine.rs:190,209,415`: `.clone()` passed as last arg in all 3 vu_loop spawn sites |
| `cargo-pmcp/src/loadtest/vu.rs`               | `cargo-pmcp/src/loadtest/client.rs`            | `McpClient::new(..., middleware)` | WIRED   | `vu.rs:152-156`: `McpClient::new(http, url, timeout, http_middleware_chain.clone())` |
| `cargo-pmcp/src/loadtest/client.rs`           | `pmcp::client::http_middleware::HttpMiddlewareChain` | `chain.process_request()`  | WIRED     | `client.rs:279`: `chain.process_request(&mut http_req, &context).await` |

---

## Requirements Coverage

The OAUTH-01 through OAUTH-06 requirement IDs are defined only in `ROADMAP.md` — they do not appear in `.planning/REQUIREMENTS.md`. This is not a phase defect; the phase was planned against ROADMAP requirements, not REQUIREMENTS.md. The REQUIREMENTS.md covers v1.5 (phases 23-25) with different IDs.

| Requirement | Source Plan  | Description (from ROADMAP/plans)                                           | Status     | Evidence                                             |
|-------------|-------------|---------------------------------------------------------------------------|------------|------------------------------------------------------|
| OAUTH-01    | 26-01-PLAN  | OAuthHelper available at `pmcp::client::oauth` behind `oauth` feature gate | SATISFIED | `src/client/oauth.rs` + `src/client/mod.rs:35-36`  |
| OAUTH-02    | 26-01-PLAN  | `create_oauth_middleware`, `default_cache_path` exported; no colored dep; pmcp::error types | SATISFIED | All verified in `src/client/oauth.rs`               |
| OAUTH-03    | 26-02-PLAN  | mcp-tester uses SDK's OAuthHelper; local oauth.rs deleted                  | SATISFIED | `lib.rs:58-59` re-exports; `oauth.rs` deleted        |
| OAUTH-04    | 26-03-PLAN  | `--oauth-client-id` / `--api-key` on `cargo pmcp loadtest run`; middleware chain threaded | SATISFIED | CLI flags in `mod.rs`; middleware in engine/VU/client |
| OAUTH-05    | 26-03-PLAN  | OAuth token acquired once at startup; auth injected via `HttpMiddlewareChain` | SATISFIED | `run.rs:64-75`; `client.rs:263-311`                |
| OAUTH-06    | 26-04-PLAN  | fmt/clippy/tests all pass across pmcp, mcp-tester, cargo-pmcp              | SATISFIED | All quality gates verified and passing               |

**Note on REQUIREMENTS.md:** OAUTH-01 through OAUTH-06 are phase-internal IDs defined in ROADMAP.md and the plan frontmatter. They do not appear in `.planning/REQUIREMENTS.md` which tracks v1.5 requirements (CLI-01 through VALD-02) mapped to phases 23-25. This gap is structural — phase 26 requirements were not backfilled into REQUIREMENTS.md. This is an informational finding only; all ROADMAP-level success criteria are satisfied.

---

## Anti-Patterns Found

No blocker or warning anti-patterns found in any of the modified files.

| File | Pattern | Severity | Finding |
|------|---------|----------|---------|
| All modified files | TODO/FIXME | None | Zero TODO/FIXME/PLACEHOLDER comments across all phase files |
| `src/client/oauth.rs` | Empty implementations | None | All methods fully implemented with real OAuth flows |
| `cargo-pmcp/src/loadtest/client.rs` | Stub handlers | None | `send_request` has complete two-path implementation with actual middleware application |
| `cargo-pmcp/src/commands/loadtest/run.rs` | Static returns | None | `resolve_auth_middleware` performs real OAuth flow or API key wrapping |

---

## Human Verification Required

### 1. Live OAuth PKCE Flow

**Test:** Run `cargo pmcp loadtest run --url https://<oauth-protected-server>/mcp --oauth-client-id <client-id>` against a real OAuth-protected MCP server.
**Expected:** Browser opens, user authenticates, token is cached at `~/.pmcp/oauth-tokens.json`, VUs begin with `Authorization: Bearer <token>` headers, load test completes successfully.
**Why human:** Requires a live OAuth provider. Cannot verify browser-open or token exchange flows programmatically.

### 2. Live API Key Flow

**Test:** Run `cargo pmcp loadtest run --url https://<server>/mcp --api-key <key>` or `MCP_API_KEY=<key> cargo pmcp loadtest run --url ...`.
**Expected:** Load test runs and all VU HTTP requests include `Authorization: Bearer <key>` header; server accepts them.
**Why human:** Requires a live server that validates API keys.

### 3. Token Cache Persistence

**Test:** Run OAuth flow once, then run again. Second run should say "Using cached OAuth token" without browser opening.
**Expected:** `~/.pmcp/oauth-tokens.json` is created after first run. Second run reads from cache within expiry.
**Why human:** Requires live OAuth flow to generate a real token cache file.

### 4. Device Code Flow Fallback

**Test:** If the OAuth server supports device code flow but not authorization code flow, the device code path should activate.
**Expected:** Terminal shows device code and verification URI; polling loop resolves when user completes auth on device.
**Why human:** Requires an OAuth server that supports device code flow.

---

## Verification Details

### Commit Verification

All 7 task commits verified in git log:
- `d716a59` — feat(26-01): add oauth feature flag with webbrowser, dirs, rand deps
- `6e578a7` — feat(26-01): create src/client/oauth.rs with OAuthHelper, wire into mod.rs
- `c5a07d9` — feat(26-02): enable oauth feature and re-export from pmcp in mcp-tester
- `a56a77b` — feat(26-02): delete local oauth.rs and import from pmcp in main.rs
- `2795480` — feat(26-03): thread HttpMiddlewareChain through McpClient, VU, and engine
- `ef3bf7c` — feat(26-03): add OAuth/API-key CLI flags and auth middleware setup
- `32f1fb3` — fix(26-04): quality gates pass across pmcp, mcp-tester, cargo-pmcp

### Quality Gate Results (Run During Verification)

```
cargo build -p pmcp --features oauth          -> Finished dev profile in 0.40s (PASS)
cargo build -p pmcp                           -> Finished dev profile in 0.15s (PASS)
cargo build -p mcp-tester                     -> Finished dev profile in 0.16s (PASS)
cargo build -p cargo-pmcp                     -> Finished dev profile in 0.20s (PASS)
cargo fmt -p pmcp -- --check                  -> PASS
cargo fmt -p mcp-tester -- --check            -> PASS
cargo fmt -p cargo-pmcp -- --check            -> PASS
cargo clippy -p pmcp --features oauth -D warn -> PASS (no warnings)
cargo clippy -p mcp-tester -D warnings        -> PASS (no warnings)
cargo clippy -p cargo-pmcp -D warnings        -> PASS (no warnings)
loadtest client tests (14 tests)              -> 14 passed
loadtest engine tests (8 tests)               -> 8 passed (including regression test)
mcp-tester tests (5 doctests)                 -> 5 passed
CLI help shows all 6 auth flags               -> PASS
```

---

## Gaps Summary

No gaps. Phase goal is fully achieved.

The goal was: "Generalize OAuthHelper into the core SDK and wire OAuth/API-key authentication into `cargo pmcp loadtest run` so VUs can target protected MCP servers."

All three dimensions verified:
1. **Generalization**: OAuthHelper moved from mcp-tester into `pmcp::client::oauth` behind the `oauth` feature gate. mcp-tester now re-exports from SDK. 723 lines of duplication eliminated.
2. **Wiring**: HttpMiddlewareChain threaded from CLI flags through `resolve_auth_middleware` -> LoadTestEngine -> vu_loop -> McpClient -> `send_request` where `process_request` injects auth headers.
3. **VU targeting protected servers**: All VUs share the same Arc-wrapped middleware chain. Auth acquired once at startup (fail-fast). Both OAuth (PKCE + device code fallback) and API-key paths implemented.

One informational finding: OAUTH-01 through OAUTH-06 are not in `.planning/REQUIREMENTS.md` (which covers v1.5 / phases 23-25). The IDs are ROADMAP-only. This does not block the phase — all ROADMAP success criteria are met.

---

_Verified: 2026-02-28_
_Verifier: Claude (gsd-verifier)_
