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```diff
diff --git a/filter/src/builtins/http/ai/openai/responses/rehydrate/mod.rs b/filter/src/builtins/http/ai/openai/responses/rehydrate/mod.rs
index 5e60a3f..8dc4ced 100644
--- a/filter/src/builtins/http/ai/openai/responses/rehydrate/mod.rs
+++ b/filter/src/builtins/http/ai/openai/responses/rehydrate/mod.rs
@@ -27,6 +27,7 @@ use crate::{
     filter::{HttpFilter, HttpFilterContext},
 };

+// -----------------------------------------------------------------------------

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Responses Passthrough Live Demo Capabilities

Codex and Upstream Providers

Praxis can sit between Codex and an upstream provider that supports the native OpenAI Responses API. Codex sends Responses requests to Praxis; Praxis rewrites the configured model name, adds effective-model routing metadata, and forwards the request to the selected backend.

The passthrough path preserves request fields such as input, instructions, tools, streaming flags, and function_call_output. Praxis does not run Codex tools or own the tool loop.

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Epic 354 Complete E2E Demo Transcript

Generated: 2026-05-20T17:42:22Z

This transcript was generated by:

bash ~/praxxis/epic-354/e2e/run-complete-e2e-demo.sh \
  ~/praxxis/epic-354/e2e/complete-e2e-demo-output.md

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PR Output: add --dump / -T CLI flag for effective config output

# dump a real config with conditions
  cargo run --quiet --bin praxis -- -T -c examples/configs/pipeline/conditional-filters.yaml 2>/dev/null

# Output

config_source: examples/configs/pipeline/conditional-filters.yaml

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PR Validation Output: Add --validate / -t CLI flag for config checking

• Add --validate / -t flag that loads and fully validates configuration then exits without starting the proxy
• Validation runs the same pipeline resolution as server startup (filter instantiation, chain expansion, ordering checks, body limits)
• Normal server startup unchanged when flag is absent

# Validate the built-in default config (should exit 0, no output)
cargo run -p praxis -- -t

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Validation of experimental e2e of agentic Praxis support

Full code for the demo here

./target/debug/praxis --config /tmp/mcp-gateway-two-backends.yaml &
cd <directory with the script at the bottom>
source .venv/bin/activate
MCP_SERVER_NAME=weather uvicorn dev_mcp:app --host 127.0.0.1 --port 8001 &
MCP_SERVER_NAME=calendar uvicorn dev_mcp:app --host 127.0.0.1 --port 8002 &

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MCP Queries

  GPU deep dives:
  - "What is the GPU temperature and power draw right now?"
  - "Show me tensor core activity and memory bandwidth utilization on the GPU"
  - "What are the SM and memory clock speeds — is the GPU throttling?"
  - "How much VRAM is used vs free on each GPU?"
  - "Show me PCIe throughput on the GPU node"

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Manual Validation for Prometheus metrics foundation with /metrics admin endpoint PR

Validation output are inline after the curl cmds

Start Praxis and a dummy endpoint:

cargo run -p praxis -- -c examples/configs/operations/admin-interface.yaml
python3 -m http.server 3000 both running.

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Manual Validation of Praxis JSON-RPC 2.0 foundation for method-based routing

Validation

  ### 1. Build Praxis with JSON-RPC Filter
  ```bash
  cargo build --release -p praxis

 2. Use Simple netcat Backend

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Failed attempts at HTTPRoute Host Header Filter Removal

Background

The ExternalModel reconciler creates an HTTPRoute with a RequestHeaderModifier filter that sets Host: <provider-endpoint> (e.g., Host: api.openai.com). This filter was questioned during PR #709 review — could BBR handle this instead, since BBR already handles path rewriting and API key injection?

We investigated whether the filter could be moved into BBR's ext-proc pipeline so that all request mutations happen in a single place.

Attempts