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diff --git a/tools/README.md b/tools/README.md
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+# Local Tools
+
+The scripts in this directory assume they will be run from the root of the
+project, as `tools/NAME`. They contain brief, branch-free, composable scripts
+intended to be run to achieve frequent goals. They act as a shared shell
+history, of a sorts, and as a place to put command-line-ish code that needs to
+be shared by multiple components.
+
+Each script begins with a brief comment demonstrating the intended invocation
+and the effects.
+
+## Authoring
+
+Tools _should_ begin with a shebang or shell `set` expression that enables
+exiting on failure and that enables command echoing, followed by a documentation
+comment:
+
+```bash
+#!/bin/bash -ex
+
+# tools/my-example-tool
+#
+# Runs all example tasks.
+
+: …
+```
diff --git a/tools/check-dependencies b/tools/check-dependencies
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+#!/bin/bash -ex
+
+# check-dependencies
+#
+# Checks that the dependencies in this project are all in use.
+
+cargo udeps --locked --all-targets
diff --git a/tools/check-lints b/tools/check-lints
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+#!/bin/bash -ex
+
+# tools/check-lints
+#
+# Checks that the code in this project passes style checks.
+
+cargo fmt -- --check
+cargo clippy -- --deny warnings
diff --git a/tools/check-tests b/tools/check-tests
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+#!/bin/bash -ex
+
+# tools/check-tests
+#
+# Checks that the code in this project passes incorrectness checks.
+
+cargo build --locked --all-targets
+cargo test
diff --git a/tools/checks b/tools/checks
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+#!/bin/bash -ex
+
+# tools/checks
+#
+# Runs all code checks. If you're automating testing, call this rather than
+# invoking a test command directly; if you're adding a test command, add it here
+# or to one of the tools called from this script.
+
+tools/check-tests
+tools/check-lints
+tools/check-dependencies