Implement prompt variable processing for Agent Client Protocol

.github/workflows/ci.yml

@@ -17,6 +17,29 @@ concurrency:
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 jobs:
+  msrv:
+    name: Minimum supported Rust version
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+
+      - name: Read MSRV from Cargo.toml
+        id: msrv
+        run: |
+          msrv="$(sed -n 's/^rust-version[[:space:]]*=[[:space:]]*"\([^"]*\)".*/\1/p' Cargo.toml)"
+          test -n "$msrv"
+          echo "version=$msrv" >> "$GITHUB_OUTPUT"
+
+      - name: Setup Rust
+        uses: actions-rust-lang/setup-rust-toolchain@46268bd060767258de96ed93c1251119784f2ab6
+        with:
+          toolchain: ${{ steps.msrv.outputs.version }}
+
+      - name: Check with MSRV
+        run: cargo check --all-targets --all-features --locked
+
   build:
     name: Build
     runs-on: ubuntu-latest
@@ -32,7 +55,7 @@ jobs:
           cache: "npm"
 
       - name: Setup Rust
-        uses: actions-rust-lang/setup-rust-toolchain@2b1f5e9b395427c92ee4e3331786ca3c37afe2d7
+        uses: actions-rust-lang/setup-rust-toolchain@46268bd060767258de96ed93c1251119784f2ab6
         with:
           toolchain: nightly,stable
           components: rustfmt,clippy
@@ -44,7 +67,7 @@ jobs:
         run: npm run format:check
 
       - name: Check for typos
-        uses: crate-ci/typos@7c572958218557a3272c2d6719629443b5cc26fd
+        uses: crate-ci/typos@aca895bf05aec0cb7dffa6f94495e923224d9f17
         with:
           config: ./typos.toml
 
@@ -61,3 +84,70 @@ jobs:
         run: |
           npm run generate
           git diff --exit-code || (echo "Generated files are out of date. Run 'npm run generate' and commit the changes." && exit 1)
+
+  rust-changes:
+    name: Detect Rust changes
+    runs-on: ubuntu-latest
+    outputs:
+      changed: ${{ steps.rust-changes.outputs.changed }}
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Check for Rust file changes
+        id: rust-changes
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+          BASE_SHA: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.sha || github.event.before }}
+          HEAD_SHA: ${{ github.sha }}
+        run: |
+          if [ "$EVENT_NAME" = "workflow_dispatch" ]; then
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+
+          if [ "$BASE_SHA" = "0000000000000000000000000000000000000000" ]; then
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+
+          if git diff --name-only "$BASE_SHA" "$HEAD_SHA" | grep -Eq '(^|/)(Cargo\.toml|Cargo\.lock)$|\.rs$'; then
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+          fi
+
+  feature-powerset:
+    name: Feature powerset (${{ matrix.partition }})
+    needs: rust-changes
+    if: needs.rust-changes.outputs.changed == 'true'
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    strategy:
+      fail-fast: false
+      matrix:
+        partition: ["1/4", "2/4", "3/4", "4/4"]
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        with:
+          persist-credentials: false
+
+      - name: Setup Rust
+        uses: actions-rust-lang/setup-rust-toolchain@46268bd060767258de96ed93c1251119784f2ab6
+        with:
+          toolchain: stable
+
+      - name: Install cargo-hack
+        uses: taiki-e/install-action@b550161ef8a7bc4f2a671c0b03a18ac9ccedea1e
+        with:
+          tool: cargo-hack
+
+      - name: Check feature powerset
+        # `unstable` is an aggregate alias for the individual unstable_* features,
+        # so excluding it avoids duplicate combinations. Limit the powerset to
+        # feature pairs to keep CI practical; the regular CI all-features build
+        # still covers the all-on case.
+        run: cargo hack --locked check --feature-powerset --exclude-features unstable --no-dev-deps --depth 2 --partition ${{ matrix.partition }}

.github/workflows/release-plz.yml

@@ -30,15 +30,15 @@ jobs:
         # Generating a GitHub token, so that PRs and tags created by
         # the release-plz-action can trigger actions workflows.
         name: Generate GitHub token
-        uses: actions/create-github-app-token@1b10c78c7865c340bc4f6099eb2f838309f1e8c3
+        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1
         id: generate-token
         with:
           # GitHub App ID secret name
           app-id: ${{ secrets.RELEASE_PLZ_APP_ID }}
           # GitHub App private key secret name
           private-key: ${{ secrets.RELEASE_PLZ_APP_PRIVATE_KEY }}
       - name: Run release-plz
-        uses: release-plz/action@1528104d2ca23787631a1c1f022abb64b34c1e11
+        uses: release-plz/action@064f4d1e36c843611ddf013be726beaa4ad804db
         with:
           command: release
         env:
@@ -59,7 +59,7 @@ jobs:
       - *install-rust
       - *generate-token
       - name: Run release-plz
-        uses: release-plz/action@1528104d2ca23787631a1c1f022abb64b34c1e11
+        uses: release-plz/action@064f4d1e36c843611ddf013be726beaa4ad804db
         with:
           command: release-pr
         env:

.github/workflows/sync-registry.yml

@@ -56,7 +56,7 @@ jobs:
         # Generating a GitHub token, so that PRs and tags created by
         # the action can trigger actions workflows.
       - name: Generate GitHub token
-        uses: actions/create-github-app-token@1b10c78c7865c340bc4f6099eb2f838309f1e8c3
+        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1
         id: generate-token
         with:
           # GitHub App ID secret name

.gitignore

@@ -14,3 +14,8 @@ typescript/*.js.map
 
 # TypeDoc generated documentation
 typescript/docs/
+
+.agents
+.kiro
+.claude
+

AGENTS.md

@@ -47,14 +47,14 @@ This is a **protocol schema library** (not a runtime application). There are no
 
 ### Key commands (see `package.json` scripts)
 
-| Command | Purpose |
-|---|---|
-| `npm run check` | Full CI pipeline: clippy, format check, spellcheck, tests |
-| `npm run generate` | Regenerate JSON schemas from Rust types + format |
-| `cargo test --all-features` | Run Rust unit + doc tests |
-| `cargo clippy --all-features` | Lint Rust code |
-| `npm run format:check` | Verify Prettier + rustfmt formatting |
-| `npm run format` | Auto-fix formatting |
+| Command                       | Purpose                                                   |
+| ----------------------------- | --------------------------------------------------------- |
+| `npm run check`               | Full CI pipeline: clippy, format check, spellcheck, tests |
+| `npm run generate`            | Regenerate JSON schemas from Rust types + format          |
+| `cargo test --all-features`   | Run Rust unit + doc tests                                 |
+| `cargo clippy --all-features` | Lint Rust code                                            |
+| `npm run format:check`        | Verify Prettier + rustfmt formatting                      |
+| `npm run format`              | Auto-fix formatting                                       |
 
 ### Gotchas
 

CHANGELOG.md

@@ -1,5 +1,49 @@
 # Changelog
 
+## [0.13.3](https://github.com/agentclientprotocol/agent-client-protocol/compare/v0.13.2...v0.13.3) - 2026-05-22
+
+### Added
+
+- Stabilize logout method ([#1273](https://github.com/agentclientprotocol/agent-client-protocol/pull/1273))
+
+### Fixed
+
+- *(unstable)* Rename provider method types to singular ([#1272](https://github.com/agentclientprotocol/agent-client-protocol/pull/1272))
+
+### Other
+
+- *(rfd)* Move additional directories RFD to Preview ([#1276](https://github.com/agentclientprotocol/agent-client-protocol/pull/1276))
+- Add schema download note to schema page ([#1269](https://github.com/agentclientprotocol/agent-client-protocol/pull/1269))
+- *(deps)* bump num-conv from 0.2.1 to 0.2.2 in the minor group ([#1244](https://github.com/agentclientprotocol/agent-client-protocol/pull/1244))
+- Set minimum supported Rust version ([#1232](https://github.com/agentclientprotocol/agent-client-protocol/pull/1232))
+- Document ACP versioning semantics ([#1229](https://github.com/agentclientprotocol/agent-client-protocol/pull/1229))
+
+## [0.13.2](https://github.com/agentclientprotocol/agent-client-protocol/compare/v0.13.1...v0.13.2) - 2026-05-17
+
+### Fixed
+
+- *(unstable)* Update additionalDirectories guidance ([#1227](https://github.com/agentclientprotocol/agent-client-protocol/pull/1227))
+
+## [0.13.1](https://github.com/agentclientprotocol/agent-client-protocol/compare/v0.13.0...v0.13.1) - 2026-05-16
+
+### Added
+
+- *(unstable)* Add unstable session delete support ([#1216](https://github.com/agentclientprotocol/agent-client-protocol/pull/1216))
+
+## [0.13.0](https://github.com/agentclientprotocol/agent-client-protocol/compare/v0.12.2...v0.13.0) - 2026-05-12
+
+### Added
+
+- *(unstable)* Add experimental MCP-over-ACP message types ([#1185](https://github.com/agentclientprotocol/agent-client-protocol/pull/1185))
+
+### Other
+
+- add unstable mcp-over-acp additions to the schema ([#1173](https://github.com/agentclientprotocol/agent-client-protocol/pull/1173))
+- *(deps)* bump the minor group with 3 updates ([#1178](https://github.com/agentclientprotocol/agent-client-protocol/pull/1178))
+- *(deps)* bump the minor group with 2 updates ([#1121](https://github.com/agentclientprotocol/agent-client-protocol/pull/1121))
+- *(unstable)* Start setting up v2 Schema scaffolding for experimentation ([#1099](https://github.com/agentclientprotocol/agent-client-protocol/pull/1099))
+- reorganize to v1 module ([#1094](https://github.com/agentclientprotocol/agent-client-protocol/pull/1094))
+
 ## [0.12.2](https://github.com/agentclientprotocol/agent-client-protocol/compare/v0.12.1...v0.12.2) - 2026-04-23
 
 ### Added

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "agent-client-protocol-schema"
 authors = ["Zed <hi@zed.dev>"]
-version = "0.12.2"
+version = "0.13.3"
 edition = "2024"
 license = "Apache-2.0"
 description = "A protocol for standardizing communication between code editors and AI coding agents"
@@ -12,16 +12,18 @@ readme = "README.md"
 keywords = ["agent", "client", "protocol", "ai", "editor"]
 categories = ["development-tools", "api-bindings"]
 include = ["/src/**/*.rs", "/README.md", "/LICENSE", "/Cargo.toml"]
+rust-version = "1.88.0"
 
 [features]
 unstable = [
     "unstable_auth_methods",
     "unstable_cancel_request",
     "unstable_elicitation",
     "unstable_llm_providers",
-    "unstable_logout",
+    "unstable_mcp_over_acp",
     "unstable_nes",
     "unstable_session_additional_directories",
+    "unstable_session_delete",
     "unstable_session_fork",
     "unstable_session_model",
     "unstable_session_usage",
@@ -37,9 +39,10 @@ unstable_auth_methods = []
 unstable_cancel_request = []
 unstable_elicitation = []
 unstable_llm_providers = []
-unstable_logout = []
+unstable_mcp_over_acp = []
 unstable_nes = []
 unstable_session_additional_directories = []
+unstable_session_delete = []
 unstable_session_fork = []
 unstable_session_model = []
 unstable_session_usage = []
@@ -61,7 +64,7 @@ derive_more = { version = "2", features = ["from", "display"] }
 schemars = { version = "1" }
 serde = { version = "1", features = ["derive", "rc"] }
 serde_json = { version = "1", features = ["raw_value"] }
-serde_with = { version = "3.18.0", features = ["json", "schemars_1"] }
+serde_with = { version = "3.20.0", features = ["json", "schemars_1"] }
 strum = { version = "0.28", features = ["derive"] }
 tracing = { version = "0.1", default-features = false, optional = true }