diff --git a/tests/antithesis/AGENTS.md b/tests/antithesis/AGENTS.md
index 7838cea65ab07..ef55f61280a7a 100644
--- a/tests/antithesis/AGENTS.md
+++ b/tests/antithesis/AGENTS.md
@@ -38,8 +38,9 @@ The fault profile is the single source of truth: change a shot's faults by editi
 ```sh
 cd tests/antithesis/scenarios
 ./launch.sh vector_to_vector_e2e_disk          # 30-minute run with the pinned profile
-DURATION=60 ./launch.sh vector_to_vector_e2e_disk   # override duration (minutes)
-DRY_RUN=1 ./launch.sh vector_to_vector_e2e_disk     # print the exact command, submit nothing
+./launch.sh vector_e2e                          # the no-disk, single-node counterpart
+DURATION=60 ./launch.sh vector_e2e              # override duration (minutes)
+DRY_RUN=1 ./launch.sh vector_e2e                # print the exact command, submit nothing
 ```
 
 The launcher reads tenant and registry from the environment (snouty's variables):
@@ -48,15 +49,15 @@ The launcher reads tenant and registry from the environment (snouty's variables)
 - `ANTITHESIS_API_KEY` (or `ANTITHESIS_USERNAME` + `ANTITHESIS_PASSWORD`)
 - `ANTITHESIS_REPOSITORY`
 
-`DESCRIPTION`, `TEST_NAME`, `FAULT_NODES`, and `WEBHOOK` are overridable; the
+`DESCRIPTION`, `TEST_NAME`, `FAULT_NODES`, and `WEBHOOK` are overridable. The
 running git commit is stamped into the description automatically so a shot records
 the code it tested. Extra snouty flags pass straight through, e.g.
-`./launch.sh vector_to_vector_e2e_disk --recipients you@example.com`.
+`./launch.sh vector_e2e --recipients you@example.com`.
 
 The pinned profile submits to the `persistent_storage` webhook and faults the
-scenario's SUT nodes (`head` and `tail` for the disk scenario) with node
-termination, hang, and throttle, plus `cpu_mod` and `clock_jitter`. The `oracle`
-is left out of termination and hang **only** — its obligation ledger lives in
-memory, so killing or freezing it would erase the run's source of truth. It is
-deliberately still subject to network faults so the egress delivery path is
-exercised.
+scenario's SUT nodes (`head` and `tail` for the disk scenario, `vector` for
+`vector_e2e`) with node termination, hang, and throttle, plus `cpu_mod` and
+`clock_jitter`. The `oracle` is never faulted with termination or hang — its
+obligation ledger lives in memory, so killing or freezing it would erase the run's
+source of truth. It is deliberately still subject to network faults so the egress
+delivery path is exercised.
diff --git a/tests/antithesis/scenarios/vector_e2e/Dockerfile b/tests/antithesis/scenarios/vector_e2e/Dockerfile
new file mode 100644
index 0000000000000..ffbd85a5c4aea
--- /dev/null
+++ b/tests/antithesis/scenarios/vector_e2e/Dockerfile
@@ -0,0 +1,111 @@
+# syntax=docker/dockerfile:1
+
+ARG SANCOV_RUSTFLAGS='["-Cpasses=sancov-module","-Cllvm-args=-sanitizer-coverage-level=3","-Cllvm-args=-sanitizer-coverage-trace-pc-guard","-Clink-args=-Wl,--build-id"]'
+
+############################
+# Vector SUT — build stage #
+############################
+FROM rust:1.92-bookworm AS vector-build
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        protobuf-compiler cmake perl build-essential pkg-config libssl-dev clang binutils \
+    && rm -rf /var/lib/apt/lists/*
+WORKDIR /src
+COPY Cargo.toml Cargo.lock rust-toolchain.toml build.rs ./
+COPY lib ./lib
+COPY src ./src
+COPY proto ./proto
+COPY benches ./benches
+COPY tests ./tests
+COPY vdev ./vdev
+COPY scripts ./scripts
+ARG SANCOV_RUSTFLAGS
+# debug=true keeps DWARF for /symbols. lto=false keeps sancov instrumentation
+# predictable and stops the optimizer from dropping the force-linked runtime.
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/src/target \
+    cargo build --release --no-default-features \
+      --features "sources-http_server,sinks-http,sources-internal_metrics,sinks-prometheus,antithesis-scenario-memory" \
+      --bin vector \
+      --config 'build.target = "x86_64-unknown-linux-gnu"' \
+      --config 'profile.release.debug = true' \
+      --config 'profile.release.lto = false' \
+      --config "target.x86_64-unknown-linux-gnu.rustflags = ${SANCOV_RUSTFLAGS}" \
+    && cp target/x86_64-unknown-linux-gnu/release/vector /usr/local/bin/vector \
+    && echo "validating instrumentation symbols..." \
+    && nm /usr/local/bin/vector | grep -q __sanitizer_cov_trace_pc_guard \
+    && nm /usr/local/bin/vector | grep -q antithesis_load_libvoidstar \
+    && echo "instrumentation OK"
+
+##################################
+# Harness (workload) — build stage
+##################################
+# The workload binaries live in the shared `harness` crate, a member of Vector's
+# workspace, so the build needs the workspace root and member manifests. `-p`
+# compiles only the harness bins.
+FROM rust:1.92-bookworm AS workload-build
+RUN apt-get update && apt-get install -y --no-install-recommends binutils \
+    && rm -rf /var/lib/apt/lists/*
+WORKDIR /src
+COPY Cargo.toml Cargo.lock rust-toolchain.toml build.rs ./
+COPY lib ./lib
+COPY src ./src
+COPY proto ./proto
+COPY benches ./benches
+COPY tests ./tests
+COPY vdev ./vdev
+COPY scripts ./scripts
+ARG SANCOV_RUSTFLAGS
+# debug=true keeps DWARF for /symbols.
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/src/target \
+    cargo build --release -p harness \
+      --config 'build.target = "x86_64-unknown-linux-gnu"' \
+      --config 'profile.release.debug = true' \
+      --config "target.x86_64-unknown-linux-gnu.rustflags = ${SANCOV_RUSTFLAGS}" \
+    && D=target/x86_64-unknown-linux-gnu/release \
+    && cp "$D/oracle" "$D/parallel_driver_produce" "$D/eventually_conservation" /usr/local/bin/ \
+    && echo "validating instrumentation symbols..." \
+    && nm /usr/local/bin/oracle | grep -q __sanitizer_cov_trace_pc_guard \
+    && nm /usr/local/bin/oracle | grep -q antithesis_load_libvoidstar \
+    && echo "instrumentation OK"
+
+#####################################
+# Runtime: Vector SUT (the one node) #
+#####################################
+FROM debian:stable-slim AS vector
+RUN apt-get update && apt-get install -y --no-install-recommends curl ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+COPY --from=vector-build /usr/local/bin/vector /usr/bin/vector
+# Bake the node config plus its benign alternate, which the reload fault swaps in
+# to force a sink rebuild.
+COPY tests/antithesis/scenarios/vector_e2e/vector.yaml /etc/vector/vector.yaml
+COPY tests/antithesis/scenarios/vector_e2e/vector.b.yaml /etc/vector/vector.b.yaml
+# The reload fault is an anytime_ test command that runs IN the node container.
+# The node stays running because its entrypoint is Vector, not a test command.
+COPY --chmod=755 tests/antithesis/scenarios/vector_e2e/anytime_reload.sh /opt/antithesis/test/v1/ve2e/anytime_reload
+RUN mkdir -p /symbols && ln -s /usr/bin/vector /symbols/vector
+ENV NO_COLOR=1
+EXPOSE 8080 9598
+ENTRYPOINT ["/usr/bin/vector"]
+
+###################################
+# Runtime: workload (oracle + cmds) #
+###################################
+FROM debian:stable-slim AS workload
+RUN apt-get update && apt-get install -y --no-install-recommends curl ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+# The oracle is the entrypoint. The two test-command binaries are the test commands:
+# drop them straight into the test template, named by their Antithesis prefix.
+COPY --from=workload-build /usr/local/bin/oracle /usr/bin/oracle
+COPY --from=workload-build /usr/local/bin/parallel_driver_produce /opt/antithesis/test/v1/ve2e/parallel_driver_produce
+COPY --from=workload-build /usr/local/bin/eventually_conservation /opt/antithesis/test/v1/ve2e/eventually_conservation
+# Symbolize all three instrumented binaries: the oracle entrypoint and both
+# test-command bins. A crash in any of them must resolve against /symbols.
+RUN mkdir -p /symbols \
+ && ln -s /usr/bin/oracle /symbols/oracle \
+ && ln -s /opt/antithesis/test/v1/ve2e/parallel_driver_produce /symbols/parallel_driver_produce \
+ && ln -s /opt/antithesis/test/v1/ve2e/eventually_conservation /symbols/eventually_conservation
+ENV NO_COLOR=1
+# The oracle waits for the SUT, emits setup_complete via the SDK, then serves so
+# Antithesis runs the test commands in this container.
+ENTRYPOINT ["/usr/bin/oracle"]
diff --git a/tests/antithesis/scenarios/vector_e2e/README.md b/tests/antithesis/scenarios/vector_e2e/README.md
new file mode 100644
index 0000000000000..4448e918b7e94
--- /dev/null
+++ b/tests/antithesis/scenarios/vector_e2e/README.md
@@ -0,0 +1,57 @@
+# vector_e2e
+
+The no-disk counterpart of `vector_to_vector_e2e_disk`. Same two properties, one
+Vector process, memory buffer instead of `disk_v2`.
+
+**Conservation**: every event the oracle acked must eventually come back, across
+arbitrary Antithesis faults. Duplicates are allowed because the contract is
+at-least-once. A missing acked id is the bug.
+
+**Liveness**: once faults stop, the node must still accept fresh writes.
+
+## Why a single process
+
+Vector's end-to-end acknowledgements are in-process: a source holds the client's
+ack until every sink that received the event has finished. So a single node is the
+honest place to test what an e2e ack promises. The producer POSTs to the node's
+`http_server` source; the 200 comes back only once the `http` sink has delivered
+the event to the oracle and the oracle returned 2xx. That means an acked id has
+**already** reached the oracle — which is why conservation can hold even though the
+node has no disk buffer and a crash drops whatever is still in memory: those
+in-flight events were never acked, so they were never an obligation.
+
+## How it works
+
+One Vector node and one oracle container.
+
+- **vector** takes an `http_server` source (`:8080`) and delivers over `http` to
+  the oracle through an in-memory buffer with `when_full: block` and e2e acks. It
+  also exposes Prometheus metrics (`:9598`) for the health gate, and runs the
+  reload fault: an `anytime_` command swaps `vector.yaml`/`vector.b.yaml` and sends
+  `SIGHUP`, forcing the sink to rebuild mid-run.
+- **oracle** (`:8686`) is one container that injects unique event ids at the node
+  and runs the HTTP endpoint the node's sink delivers back to.
+
+The oracle keeps its id sets in memory and Antithesis never terminates it, so the
+faults under test cannot corrupt the judge. The workload binaries (`oracle`,
+`parallel_driver_produce`, `eventually_conservation`) are the shared, buffer-
+agnostic bins from `tests/antithesis/harness`, pointed at this topology by the
+environment in `docker-compose.yaml`.
+
+## Run
+
+Validate the config locally:
+
+```bash
+cd tests/antithesis
+docker compose -f scenarios/vector_e2e/docker-compose.yaml build
+snouty validate scenarios/vector_e2e
+```
+
+Submit a run through the shared launcher, which pins the fault profile (see
+`tests/antithesis/AGENTS.md`):
+
+```bash
+cd tests/antithesis/scenarios
+./launch.sh vector_e2e
+```
diff --git a/tests/antithesis/scenarios/vector_e2e/anytime_reload.sh b/tests/antithesis/scenarios/vector_e2e/anytime_reload.sh
new file mode 100644
index 0000000000000..71416aaf9324b
--- /dev/null
+++ b/tests/antithesis/scenarios/vector_e2e/anytime_reload.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+[ -n "${VECTOR_CONFIG_ALT:-}" ] || exit 0
+cfg="${VECTOR_CONFIG:?}"
+alt="${VECTOR_CONFIG_ALT:?}"
+
+# Vector only ever reads $cfg, so reload alternates $cfg between two immutable
+# sources rather than swapping two live files. The alternate $alt is never
+# written, and the baseline (the original $cfg) is snapshotted once, so the only
+# mutable file is $cfg and the only writes to it are a single rename of a fully
+# written temp. The node-termination fault can therefore interrupt this script at
+# any point and leave $cfg as one complete config or the other, never half-written
+# and never collapsed so both sources hold the same content. Alternation always
+# resumes on the next invocation.
+base="$cfg.orig"
+if [ ! -f "$base" ]; then
+    cp "$cfg" "$base.tmp"
+    mv "$base.tmp" "$base"
+fi
+
+# Pick whichever source is not currently live. cksum reads from stdin so its
+# output is the checksum alone, with no filename to differ on.
+if [ "$(cksum <"$cfg")" = "$(cksum <"$alt")" ]; then
+    next="$base"
+else
+    next="$alt"
+fi
+cp "$next" "$cfg.tmp"
+mv "$cfg.tmp" "$cfg"
+
+# Vector is PID 1 in the node container. SIGHUP triggers reload-from-disk.
+kill -HUP 1
+sleep 5
diff --git a/tests/antithesis/scenarios/vector_e2e/docker-compose.yaml b/tests/antithesis/scenarios/vector_e2e/docker-compose.yaml
new file mode 100644
index 0000000000000..abbc3a136b36d
--- /dev/null
+++ b/tests/antithesis/scenarios/vector_e2e/docker-compose.yaml
@@ -0,0 +1,51 @@
+name: vector-e2e
+
+x-vector-build: &vector-build
+  context: ../../../..
+  dockerfile: tests/antithesis/scenarios/vector_e2e/Dockerfile
+  target: vector
+
+x-node-health: &node-health
+  test: ["CMD", "curl", "-fsS", "http://localhost:9598/metrics"]
+  interval: 5s
+  timeout: 3s
+  retries: 30
+  start_period: 10s
+
+services:
+  vector:
+    container_name: vector
+    hostname: vector
+    platform: linux/amd64
+    init: true
+    build: *vector-build
+    image: ve2e-vector:${ANTITHESIS_IMAGE_TAG:-dev}
+    entrypoint: ["/usr/bin/vector", "--config", "/etc/vector/vector.yaml"]
+    # vector runs the reload fault: VECTOR_CONFIG_ALT lets anytime_reload swap
+    # configs and SIGHUP, forcing the sink to rebuild. No disk buffer, so no volume.
+    environment:
+      NO_COLOR: "1"
+      VECTOR_CONFIG: "/etc/vector/vector.yaml"
+      VECTOR_CONFIG_ALT: "/etc/vector/vector.b.yaml"
+    healthcheck: *node-health
+
+  oracle:
+    container_name: oracle
+    hostname: oracle
+    platform: linux/amd64
+    init: true
+    build:
+      context: ../../../..
+      dockerfile: tests/antithesis/scenarios/vector_e2e/Dockerfile
+      target: workload
+    image: ve2e-oracle:${ANTITHESIS_IMAGE_TAG:-dev}
+    environment:
+      NO_COLOR: "1"
+      SCENARIO_NAME: "vector_e2e"
+      VECTOR_SOURCE_URL: "http://vector:8080/"
+      VECTOR_METRICS_URL: "http://vector:9598/metrics"
+      VECTOR_METRICS_URLS: "http://vector:9598/metrics"
+      # Test commands run in this container, so they reach the oracle locally.
+      ORACLE_URL: "http://127.0.0.1:8686"
+    depends_on:
+      vector: { condition: service_healthy }
diff --git a/tests/antithesis/scenarios/vector_e2e/vector.b.yaml b/tests/antithesis/scenarios/vector_e2e/vector.b.yaml
new file mode 100644
index 0000000000000..d426c7413699a
--- /dev/null
+++ b/tests/antithesis/scenarios/vector_e2e/vector.b.yaml
@@ -0,0 +1,36 @@
+sources:
+  in:
+    type: http_server
+    address: 0.0.0.0:8080
+    decoding:
+      codec: json
+    acknowledgements:
+      enabled: true
+
+  metrics:
+    type: internal_metrics
+    scrape_interval_secs: 1
+
+sinks:
+  out:
+    type: http
+    inputs: [in]
+    uri: http://oracle:8686/ingest
+    method: post
+    encoding:
+      codec: json
+    # Benign alternate the reload fault swaps in. It differs from vector.yaml only
+    # by an explicit request timeout, enough to make the reload rebuild the sink.
+    request:
+      timeout_secs: 45
+    buffer:
+      type: memory
+      max_events: 500
+      when_full: block
+    acknowledgements:
+      enabled: true
+
+  prom:
+    type: prometheus_exporter
+    inputs: [metrics]
+    address: 0.0.0.0:9598
diff --git a/tests/antithesis/scenarios/vector_e2e/vector.yaml b/tests/antithesis/scenarios/vector_e2e/vector.yaml
new file mode 100644
index 0000000000000..8163fcbd08d55
--- /dev/null
+++ b/tests/antithesis/scenarios/vector_e2e/vector.yaml
@@ -0,0 +1,38 @@
+sources:
+  in:
+    type: http_server
+    address: 0.0.0.0:8080
+    decoding:
+      codec: json
+    acknowledgements:
+      enabled: true
+
+  metrics:
+    type: internal_metrics
+    scrape_interval_secs: 1
+
+sinks:
+  out:
+    type: http
+    inputs: [in]
+    uri: http://oracle:8686/ingest
+    method: post
+    encoding:
+      codec: json
+    # Memory buffer, no disk: this is the no-disk counterpart of the disk scenario.
+    # when_full: block keeps the same backpressure so the source applies it to the
+    # client instead of dropping. With end-to-end acks the 200 to the producer
+    # fires only once this sink has delivered to the oracle, so an acked event has
+    # already arrived — that is why conservation can hold even though a crash loses
+    # whatever is still in this in-memory buffer.
+    buffer:
+      type: memory
+      max_events: 500
+      when_full: block
+    acknowledgements:
+      enabled: true
+
+  prom:
+    type: prometheus_exporter
+    inputs: [metrics]
+    address: 0.0.0.0:9598