diff --git a/lib/cli.js b/lib/cli.js
index c790610f1..e0cc2c22a 100644
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -35,7 +35,7 @@ function parseGithubApiUrl(inputUrl) {
 program
     .command('upload')
     .description('Uploads a SARIF file, or all SARIF files from a directory, to code scanning')
-    .requiredOption('--sarif-file <file>', 'SARIF file to upload')
+    .requiredOption('--sarif-file <file>', 'SARIF file to upload; can also be a directory for uploading multiple')
     .requiredOption('--repository <repository>', 'Repository name')
     .requiredOption('--commit <commit>', 'SHA of commit that was analyzed')
     .requiredOption('--ref <ref>', 'Name of ref that was analyzed')
diff --git a/lib/cli.js.map b/lib/cli.js.map
index 7e39bc7aa..bcffe1151 100644
--- a/lib/cli.js.map
+++ b/lib/cli.js.map
@@ -1 +1 @@
-{"version":3,"file":"cli.js","sourceRoot":"","sources":["../src/cli.ts"],"names":[],"mappings":";;;;;;;;;AAAA,yCAAoC;AACpC,2CAA6B;AAE7B,uCAAyC;AACzC,6CAAkD;AAClD,yDAA2C;AAE3C,MAAM,OAAO,GAAG,IAAI,mBAAO,EAAE,CAAC;AAC9B,OAAO,CAAC,OAAO,CAAC,OAAO,CAAC,CAAC;AAYzB,SAAS,iBAAiB,CAAC,QAAgB;IACzC,IAAI;QACF,MAAM,GAAG,GAAG,IAAI,GAAG,CAAC,QAAQ,CAAC,CAAC;QAE9B,kDAAkD;QAClD,0CAA0C;QAC1C,IAAI,GAAG,CAAC,QAAQ,KAAK,YAAY,IAAI,GAAG,CAAC,QAAQ,KAAK,gBAAgB,EAAE;YACtE,OAAO,wBAAwB,CAAC;SACjC;QAED,gDAAgD;QAChD,IAAI,GAAG,CAAC,QAAQ,CAAC,OAAO,CAAC,SAAS,CAAC,KAAK,CAAC,CAAC,EAAE;YAC1C,GAAG,CAAC,QAAQ,GAAG,IAAI,CAAC,IAAI,CAAC,GAAG,CAAC,QAAQ,EAAE,KAAK,EAAE,IAAI,CAAC,CAAC;SACrD;QAED,OAAO,GAAG,CAAC,QAAQ,EAAE,CAAC;KAEvB;IAAC,OAAO,CAAC,EAAE;QACV,MAAM,IAAI,KAAK,CAAC,IAAI,QAAQ,sBAAsB,CAAC,CAAC;KACrD;AACH,CAAC;AAED,OAAO;KACJ,OAAO,CAAC,QAAQ,CAAC;KACjB,WAAW,CAAC,6EAA6E,CAAC;KAC1F,cAAc,CAAC,qBAAqB,EAAE,sBAAsB,CAAC;KAC7D,cAAc,CAAC,2BAA2B,EAAE,iBAAiB,CAAC;KAC9D,cAAc,CAAC,mBAAmB,EAAE,iCAAiC,CAAC;KACtE,cAAc,CAAC,aAAa,EAAE,+BAA+B,CAAC;KAC9D,cAAc,CAAC,oBAAoB,EAAE,wBAAwB,CAAC;KAC9D,cAAc,CAAC,sBAAsB,EAAE,qFAAqF,CAAC;KAC7H,MAAM,CAAC,wBAAwB,EAAE,oDAAoD,CAAC;KACtF,MAAM,CAAC,KAAK,EAAE,GAAe,EAAE,EAAE;IAChC,MAAM,MAAM,GAAG,sBAAY,EAAE,CAAC;IAC9B,IAAI;QACF,MAAM,UAAU,CAAC,MAAM,CACrB,GAAG,CAAC,SAAS,EACb,+BAAkB,CAAC,GAAG,CAAC,UAAU,CAAC,EAClC,GAAG,CAAC,MAAM,EACV,GAAG,CAAC,GAAG,EACP,SAAS,EACT,SAAS,EACT,SAAS,EACT,GAAG,CAAC,YAAY,IAAI,OAAO,CAAC,GAAG,EAAE,EACjC,SAAS,EACT,GAAG,CAAC,UAAU,EACd,iBAAiB,CAAC,GAAG,CAAC,SAAS,CAAC,EAChC,KAAK,EACL,MAAM,CAAC,CAAC;KACX;IAAC,OAAO,CAAC,EAAE;QACV,MAAM,CAAC,KAAK,CAAC,eAAe,CAAC,CAAC;QAC9B,MAAM,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;KACjB;AACH,CAAC,CAAC,CAAC;AAEL,OAAO,CAAC,KAAK,CAAC,OAAO,CAAC,IAAI,CAAC,CAAC"}
\ No newline at end of file
+{"version":3,"file":"cli.js","sourceRoot":"","sources":["../src/cli.ts"],"names":[],"mappings":";;;;;;;;;AAAA,yCAAoC;AACpC,2CAA6B;AAE7B,uCAAyC;AACzC,6CAAkD;AAClD,yDAA2C;AAE3C,MAAM,OAAO,GAAG,IAAI,mBAAO,EAAE,CAAC;AAC9B,OAAO,CAAC,OAAO,CAAC,OAAO,CAAC,CAAC;AAYzB,SAAS,iBAAiB,CAAC,QAAgB;IACzC,IAAI;QACF,MAAM,GAAG,GAAG,IAAI,GAAG,CAAC,QAAQ,CAAC,CAAC;QAE9B,kDAAkD;QAClD,0CAA0C;QAC1C,IAAI,GAAG,CAAC,QAAQ,KAAK,YAAY,IAAI,GAAG,CAAC,QAAQ,KAAK,gBAAgB,EAAE;YACtE,OAAO,wBAAwB,CAAC;SACjC;QAED,gDAAgD;QAChD,IAAI,GAAG,CAAC,QAAQ,CAAC,OAAO,CAAC,SAAS,CAAC,KAAK,CAAC,CAAC,EAAE;YAC1C,GAAG,CAAC,QAAQ,GAAG,IAAI,CAAC,IAAI,CAAC,GAAG,CAAC,QAAQ,EAAE,KAAK,EAAE,IAAI,CAAC,CAAC;SACrD;QAED,OAAO,GAAG,CAAC,QAAQ,EAAE,CAAC;KAEvB;IAAC,OAAO,CAAC,EAAE;QACV,MAAM,IAAI,KAAK,CAAC,IAAI,QAAQ,sBAAsB,CAAC,CAAC;KACrD;AACH,CAAC;AAED,OAAO;KACJ,OAAO,CAAC,QAAQ,CAAC;KACjB,WAAW,CAAC,6EAA6E,CAAC;KAC1F,cAAc,CAAC,qBAAqB,EAAE,sEAAsE,CAAC;KAC7G,cAAc,CAAC,2BAA2B,EAAE,iBAAiB,CAAC;KAC9D,cAAc,CAAC,mBAAmB,EAAE,iCAAiC,CAAC;KACtE,cAAc,CAAC,aAAa,EAAE,+BAA+B,CAAC;KAC9D,cAAc,CAAC,oBAAoB,EAAE,wBAAwB,CAAC;KAC9D,cAAc,CAAC,sBAAsB,EAAE,qFAAqF,CAAC;KAC7H,MAAM,CAAC,wBAAwB,EAAE,oDAAoD,CAAC;KACtF,MAAM,CAAC,KAAK,EAAE,GAAe,EAAE,EAAE;IAChC,MAAM,MAAM,GAAG,sBAAY,EAAE,CAAC;IAC9B,IAAI;QACF,MAAM,UAAU,CAAC,MAAM,CACrB,GAAG,CAAC,SAAS,EACb,+BAAkB,CAAC,GAAG,CAAC,UAAU,CAAC,EAClC,GAAG,CAAC,MAAM,EACV,GAAG,CAAC,GAAG,EACP,SAAS,EACT,SAAS,EACT,SAAS,EACT,GAAG,CAAC,YAAY,IAAI,OAAO,CAAC,GAAG,EAAE,EACjC,SAAS,EACT,GAAG,CAAC,UAAU,EACd,iBAAiB,CAAC,GAAG,CAAC,SAAS,CAAC,EAChC,KAAK,EACL,MAAM,CAAC,CAAC;KACX;IAAC,OAAO,CAAC,EAAE;QACV,MAAM,CAAC,KAAK,CAAC,eAAe,CAAC,CAAC;QAC9B,MAAM,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;KACjB;AACH,CAAC,CAAC,CAAC;AAEL,OAAO,CAAC,KAAK,CAAC,OAAO,CAAC,IAAI,CAAC,CAAC"}
\ No newline at end of file
diff --git a/lib/upload-lib.js b/lib/upload-lib.js
index 759723152..28899573f 100644
--- a/lib/upload-lib.js
+++ b/lib/upload-lib.js
@@ -1,7 +1,4 @@
 "use strict";
-var __importDefault = (this && this.__importDefault) || function (mod) {
-    return (mod && mod.__esModule) ? mod : { "default": mod };
-};
 var __importStar = (this && this.__importStar) || function (mod) {
     if (mod && mod.__esModule) return mod;
     var result = {};
@@ -9,7 +6,11 @@ var __importStar = (this && this.__importStar) || function (mod) {
     result["default"] = mod;
     return result;
 };
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
 Object.defineProperty(exports, "__esModule", { value: true });
+const core = __importStar(require("@actions/core"));
 const file_url_1 = __importDefault(require("file-url"));
 const fs = __importStar(require("fs"));
 const jsonschema = __importStar(require("jsonschema"));
@@ -17,6 +18,7 @@ const path = __importStar(require("path"));
 const zlib_1 = __importDefault(require("zlib"));
 const api = __importStar(require("./api-client"));
 const fingerprints = __importStar(require("./fingerprints"));
+const sharedEnv = __importStar(require("./shared-environment"));
 const util = __importStar(require("./util"));
 // Takes a list of paths to sarif files and combines them together,
 // returning the contents of the combined sarif file.
@@ -98,19 +100,19 @@ async function uploadPayload(payload, repositoryNwo, githubAuth, githubApiUrl, m
 // Uploads a single sarif file or a directory of sarif files
 // depending on what the path happens to refer to.
 // Returns true iff the upload occurred and succeeded
-async function upload(sarifFile, repositoryNwo, commitOid, ref, analysisKey, analysisName, workflowRunID, checkoutPath, environment, githubAuth, githubApiUrl, mode, logger) {
+async function upload(sarifPath, repositoryNwo, commitOid, ref, analysisKey, analysisName, workflowRunID, checkoutPath, environment, githubAuth, githubApiUrl, mode, logger) {
     const sarifFiles = [];
-    if (fs.lstatSync(sarifFile).isDirectory()) {
-        fs.readdirSync(sarifFile)
+    if (fs.lstatSync(sarifPath).isDirectory()) {
+        fs.readdirSync(sarifPath)
             .filter(f => f.endsWith(".sarif"))
-            .map(f => path.resolve(sarifFile, f))
+            .map(f => path.resolve(sarifPath, f))
             .forEach(f => sarifFiles.push(f));
         if (sarifFiles.length === 0) {
-            throw new Error("No SARIF files found to upload in \"" + sarifFile + "\".");
+            throw new Error("No SARIF files found to upload in \"" + sarifPath + "\".");
         }
     }
     else {
-        sarifFiles.push(sarifFile);
+        sarifFiles.push(sarifPath);
     }
     return await uploadFiles(sarifFiles, repositoryNwo, commitOid, ref, analysisKey, analysisName, workflowRunID, checkoutPath, environment, githubAuth, githubApiUrl, mode, logger);
 }
@@ -148,6 +150,14 @@ exports.validateSarifFileSchema = validateSarifFileSchema;
 // Returns true iff the upload occurred and succeeded
 async function uploadFiles(sarifFiles, repositoryNwo, commitOid, ref, analysisKey, analysisName, workflowRunID, checkoutPath, environment, githubAuth, githubApiUrl, mode, logger) {
     logger.info("Uploading sarif files: " + JSON.stringify(sarifFiles));
+    if (mode === 'actions') {
+        // This check only works on actions as env vars don't persist between calls to the CLI
+        const sentinelEnvVar = "CODEQL_UPLOAD_SARIF";
+        if (process.env[sentinelEnvVar]) {
+            throw new Error("Aborting upload: only one run of the codeql/analyze or codeql/upload-sarif actions is allowed per job");
+        }
+        core.exportVariable(sentinelEnvVar, sentinelEnvVar);
+    }
     // Validate that the files we were asked to upload are all valid SARIF files
     for (const file of sarifFiles) {
         validateSarifFileSchema(file, logger);
@@ -168,6 +178,7 @@ async function uploadFiles(sarifFiles, repositoryNwo, commitOid, ref, analysisKe
             "workflow_run_id": workflowRunID,
             "checkout_uri": checkoutURI,
             "environment": environment,
+            "started_at": process.env[sharedEnv.CODEQL_WORKFLOW_STARTED_AT],
             "tool_names": toolNames,
         });
     }
@@ -182,11 +193,11 @@ async function uploadFiles(sarifFiles, repositoryNwo, commitOid, ref, analysisKe
     }
     // Log some useful debug info about the info
     const rawUploadSizeBytes = sarifPayload.length;
-    console.debug("Raw upload size: " + rawUploadSizeBytes + " bytes");
+    logger.debug("Raw upload size: " + rawUploadSizeBytes + " bytes");
     const zippedUploadSizeBytes = zipped_sarif.length;
-    console.debug("Base64 zipped upload size: " + zippedUploadSizeBytes + " bytes");
+    logger.debug("Base64 zipped upload size: " + zippedUploadSizeBytes + " bytes");
     const numResultInSarif = countResultsInSarif(sarifPayload);
-    console.debug("Number of results in upload: " + numResultInSarif);
+    logger.debug("Number of results in upload: " + numResultInSarif);
     // Make the upload
     await uploadPayload(payload, repositoryNwo, githubAuth, githubApiUrl, mode, logger);
     return {
diff --git a/lib/upload-lib.js.map b/lib/upload-lib.js.map
index 26fc93f3e..f685212cb 100644
--- a/lib/upload-lib.js.map
+++ b/lib/upload-lib.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"upload-lib.js","sourceRoot":"","sources":["../src/upload-lib.ts"],"names":[],"mappings":";;;;;;;;;;;;AAAA,oDAAsC;AACtC,wDAA+B;AAC/B,uCAAyB;AACzB,uDAAyC;AACzC,2CAA6B;AAC7B,gDAAwB;AAExB,kDAAoC;AACpC,6DAA+C;AAG/C,gEAAkD;AAClD,6CAA+B;AAI/B,mEAAmE;AACnE,qDAAqD;AACrD,SAAgB,iBAAiB,CAAC,UAAoB;IACpD,IAAI,aAAa,GAAG;QAClB,OAAO,EAAE,IAAI;QACb,IAAI,EAAE,EAAW;KAClB,CAAC;IAEF,KAAK,IAAI,SAAS,IAAI,UAAU,EAAE;QAChC,IAAI,WAAW,GAAG,IAAI,CAAC,KAAK,CAAC,EAAE,CAAC,YAAY,CAAC,SAAS,EAAE,MAAM,CAAC,CAAC,CAAC;QACjE,sBAAsB;QACtB,IAAI,aAAa,CAAC,OAAO,KAAK,IAAI,EAAE;YAClC,aAAa,CAAC,OAAO,GAAG,WAAW,CAAC,OAAO,CAAC;SAC7C;aAAM,IAAI,aAAa,CAAC,OAAO,KAAK,WAAW,CAAC,OAAO,EAAE;YACxD,MAAM,wCAAwC,GAAG,aAAa,CAAC,OAAO,GAAG,OAAO,GAAG,WAAW,CAAC,OAAO,CAAC;SACxG;QAED,aAAa,CAAC,IAAI,CAAC,IAAI,CAAC,GAAG,WAAW,CAAC,IAAI,CAAC,CAAC;KAC9C;IAED,OAAO,IAAI,CAAC,SAAS,CAAC,aAAa,CAAC,CAAC;AACvC,CAAC;AAnBD,8CAmBC;AAED,4BAA4B;AAC5B,qEAAqE;AACrE,KAAK,UAAU,aAAa,CAC1B,OAAY,EACZ,aAA4B,EAC5B,UAAkB,EAClB,YAAoB,EACpB,IAAgB,EAChB,MAAc;IAEd,MAAM,CAAC,IAAI,CAAC,mBAAmB,CAAC,CAAC;IAEjC,sDAAsD;IACtD,MAAM,QAAQ,GAAG,OAAO,CAAC,GAAG,CAAC,WAAW,CAAC,KAAK,MAAM,IAAI,KAAK,CAAC;IAC9D,IAAI,QAAQ,EAAE;QACZ,OAAO;KACR;IAED,uDAAuD;IACvD,0CAA0C;IAC1C,4DAA4D;IAC5D,2DAA2D;IAC3D,MAAM,cAAc,GAAG,CAAC,CAAC,EAAE,CAAC,EAAE,EAAE,CAAC,CAAC;IAElC,MAAM,MAAM,GAAG,GAAG,CAAC,YAAY,CAAC,UAAU,EAAE,YAAY,CAAC,CAAC;IAE1D,KAAK,IAAI,OAAO,GAAG,CAAC,EAAE,OAAO,IAAI,cAAc,CAAC,MAAM,EAAE,OAAO,EAAE,EAAE;QACjE,MAAM,MAAM,GAAG,IAAI,KAAK,SAAS;YAC/B,CAAC,CAAC,gDAAgD;YAClD,CAAC,CAAC,+CAA+C,CAAC;QACpD,MAAM,QAAQ,GAAG,MAAM,MAAM,CAAC,OAAO,CAAC,MAAM,EAAE,CAAC;YAC7C,KAAK,EAAE,aAAa,CAAC,KAAK;YAC1B,IAAI,EAAE,aAAa,CAAC,IAAI;YACxB,IAAI,EAAE,OAAO;SACd,CAAC,CAAC,CAAC;QAEJ,MAAM,CAAC,KAAK,CAAC,mBAAmB,GAAG,QAAQ,CAAC,MAAM,CAAC,CAAC;QAEpD,MAAM,UAAU,GAAG,QAAQ,CAAC,MAAM,CAAC;QACnC,IAAI,UAAU,KAAK,GAAG,EAAE;YACtB,MAAM,CAAC,IAAI,CAAC,+BAA+B,CAAC,CAAC;YAC7C,OAAO;SACR;QAED,MAAM,SAAS,GAAG,QAAQ,CAAC,OAAO,CAAC,qBAAqB,CAAC,CAAC;QAE1D,oEAAoE;QACpE,IAAI,CAAC,UAAU,IAAI,UAAU,GAAG,GAAG,IAAI,UAAU,IAAI,GAAG,EAAE;YACxD,MAAM,IAAI,KAAK,CAAC,iBAAiB,GAAG,SAAS,GAAG,MAAM,GAAG,UAAU,GAAG,IAAI,GAAG,IAAI,CAAC,SAAS,CAAC,QAAQ,CAAC,IAAI,CAAC,CAAC,CAAC;SAC7G;QAED,gDAAgD;QAChD,IAAI,OAAO,GAAG,cAAc,CAAC,MAAM,EAAE;YACnC,uEAAuE;YACvE,MAAM,CAAC,OAAO,CAAC,kBAAkB,GAAG,CAAC,OAAO,GAAG,CAAC,CAAC,GAAG,MAAM,GAAG,CAAC,cAAc,CAAC,MAAM,GAAG,CAAC,CAAC;gBACtF,YAAY,GAAG,SAAS,GAAG,iBAAiB,GAAG,cAAc,CAAC,OAAO,CAAC;gBACtE,aAAa,GAAG,UAAU,GAAG,IAAI,GAAG,IAAI,CAAC,SAAS,CAAC,QAAQ,CAAC,IAAI,CAAC,CAAC,CAAC;YACrE,+BAA+B;YAC/B,MAAM,IAAI,OAAO,CAAC,CAAC,CAAC,EAAE,CAAC,UAAU,CAAC,CAAC,EAAE,cAAc,CAAC,OAAO,CAAC,GAAG,IAAI,CAAC,CAAC,CAAC;YACtE,SAAS;SAEV;aAAM;YACL,wEAAwE;YACxE,wDAAwD;YACxD,qEAAqE;YACrE,MAAM,IAAI,KAAK,CAAC,iBAAiB,GAAG,SAAS,GAAG,MAAM,GAAG,UAAU,GAAG,IAAI,GAAG,IAAI,CAAC,SAAS,CAAC,QAAQ,CAAC,IAAI,CAAC,CAAC,CAAC;SAC7G;KACF;IAED,qEAAqE;IACrE,yDAAyD;IACzD,MAAM,IAAI,KAAK,CAAC,eAAe,CAAC,CAAC;AACnC,CAAC;AAWD,4DAA4D;AAC5D,kDAAkD;AAClD,qDAAqD;AAC9C,KAAK,UAAU,MAAM,CAC1B,SAAiB,EACjB,aAA4B,EAC5B,SAAiB,EACjB,GAAW,EACX,WAA+B,EAC/B,YAAgC,EAChC,aAAiC,EACjC,YAAoB,EACpB,WAA+B,EAC/B,UAAkB,EAClB,YAAoB,EACpB,IAAgB,EAChB,MAAc;IAEd,MAAM,UAAU,GAAa,EAAE,CAAC;IAChC,IAAI,EAAE,CAAC,SAAS,CAAC,SAAS,CAAC,CAAC,WAAW,EAAE,EAAE;QACzC,EAAE,CAAC,WAAW,CAAC,SAAS,CAAC;aACtB,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,QAAQ,CAAC,QAAQ,CAAC,CAAC;aACjC,GAAG,CAAC,CAAC,CAAC,EAAE,CAAC,IAAI,CAAC,OAAO,CAAC,SAAS,EAAE,CAAC,CAAC,CAAC;aACpC,OAAO,CAAC,CAAC,CAAC,EAAE,CAAC,UAAU,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC,CAAC;QACpC,IAAI,UAAU,CAAC,MAAM,KAAK,CAAC,EAAE;YAC3B,MAAM,IAAI,KAAK,CAAC,sCAAsC,GAAG,SAAS,GAAG,KAAK,CAAC,CAAC;SAC7E;KACF;SAAM;QACL,UAAU,CAAC,IAAI,CAAC,SAAS,CAAC,CAAC;KAC5B;IAED,OAAO,MAAM,WAAW,CACtB,UAAU,EACV,aAAa,EACb,SAAS,EACT,GAAG,EACH,WAAW,EACX,YAAY,EACZ,aAAa,EACb,YAAY,EACZ,WAAW,EACX,UAAU,EACV,YAAY,EACZ,IAAI,EACJ,MAAM,CAAC,CAAC;AACZ,CAAC;AA1CD,wBA0CC;AAED,uDAAuD;AACvD,SAAgB,mBAAmB,CAAC,KAAa;IAC/C,IAAI,UAAU,GAAG,CAAC,CAAC;IACnB,KAAK,MAAM,GAAG,IAAI,IAAI,CAAC,KAAK,CAAC,KAAK,CAAC,CAAC,IAAI,EAAE;QACxC,UAAU,IAAI,GAAG,CAAC,OAAO,CAAC,MAAM,CAAC;KAClC;IACD,OAAO,UAAU,CAAC;AACpB,CAAC;AAND,kDAMC;AAED,mEAAmE;AACnE,0CAA0C;AAC1C,SAAgB,uBAAuB,CAAC,aAAqB,EAAE,MAAc;IAC3E,MAAM,KAAK,GAAG,IAAI,CAAC,KAAK,CAAC,EAAE,CAAC,YAAY,CAAC,aAAa,EAAE,MAAM,CAAC,CAAC,CAAC;IACjE,MAAM,MAAM,GAAG,OAAO,CAAC,iCAAiC,CAAC,CAAC;IAE1D,MAAM,MAAM,GAAG,IAAI,UAAU,CAAC,SAAS,EAAE,CAAC,QAAQ,CAAC,KAAK,EAAE,MAAM,CAAC,CAAC;IAClE,IAAI,CAAC,MAAM,CAAC,KAAK,EAAE;QACjB,+EAA+E;QAC/E,KAAK,MAAM,KAAK,IAAI,MAAM,CAAC,MAAM,EAAE;YACjC,MAAM,CAAC,UAAU,CAAC,iBAAiB,GAAG,KAAK,CAAC,KAAK,CAAC,CAAC;YACnD,MAAM,CAAC,IAAI,CAAC,IAAI,CAAC,SAAS,CAAC,KAAK,EAAE,IAAI,EAAE,CAAC,CAAC,CAAC,CAAC;YAC5C,MAAM,CAAC,QAAQ,EAAE,CAAC;SACnB;QAED,8DAA8D;QAC9D,iFAAiF;QACjF,MAAM,WAAW,GAAG,MAAM,CAAC,MAAM,CAAC,GAAG,CAAC,CAAC,CAAC,EAAE,CAAC,IAAI,GAAG,CAAC,CAAC,KAAK,CAAC,CAAC;QAC3D,MAAM,IAAI,KAAK,CAAC,qBAAqB,GAAG,aAAa,GAAG,gCAAgC,GAAG,WAAW,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC,CAAC;KACpH;AACH,CAAC;AAlBD,0DAkBC;AAED,wCAAwC;AACxC,qDAAqD;AACrD,KAAK,UAAU,WAAW,CACxB,UAAoB,EACpB,aAA4B,EAC5B,SAAiB,EACjB,GAAW,EACX,WAA+B,EAC/B,YAAgC,EAChC,aAAiC,EACjC,YAAoB,EACpB,WAA+B,EA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\ No newline at end of file
diff --git a/package.json b/package.json
index 94523ca21..cd3e3b49a 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
     "@actions/github": "^2.2.0",
     "@actions/http-client": "^1.0.8",
     "@actions/tool-cache": "^1.5.5",
-    "commander": "6.0.0",
+    "commander": "^6.0.0",
     "console-log-level": "^1.4.1",
     "file-url": "^3.0.0",
     "fs": "0.0.1-security",
@@ -54,9 +54,9 @@
     "sinon": "^9.0.2",
     "tslint": "^6.1.0",
     "tslint-eslint-rules": "^5.4.0",
-    "ts-loader": "8.0.2",
+    "ts-loader": "^8.0.2",
     "typescript": "^3.7.5",
-    "webpack": "4.44.1",
-    "webpack-cli": "3.3.12"
+    "webpack": "^4.44.1",
+    "webpack-cli": "^3.3.12"
   }
 }
\ No newline at end of file
diff --git a/src/cli.ts b/src/cli.ts
index f4a6f5fa9..e762740dc 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -43,7 +43,7 @@ function parseGithubApiUrl(inputUrl: string): string {
 program
   .command('upload')
   .description('Uploads a SARIF file, or all SARIF files from a directory, to code scanning')
-  .requiredOption('--sarif-file <file>', 'SARIF file to upload')
+  .requiredOption('--sarif-file <file>', 'SARIF file to upload; can also be a directory for uploading multiple')
   .requiredOption('--repository <repository>', 'Repository name')
   .requiredOption('--commit <commit>', 'SHA of commit that was analyzed')
   .requiredOption('--ref <ref>', 'Name of ref that was analyzed')
diff --git a/src/upload-lib.ts b/src/upload-lib.ts
index b6ec08426..4e55ed46d 100644
--- a/src/upload-lib.ts
+++ b/src/upload-lib.ts
@@ -1,3 +1,4 @@
+import * as core from '@actions/core';
 import fileUrl from 'file-url';
 import * as fs from 'fs';
 import * as jsonschema from 'jsonschema';
@@ -8,6 +9,7 @@ import * as api from './api-client';
 import * as fingerprints from './fingerprints';
 import { Logger } from './logging';
 import { RepositoryNwo } from './repository';
+import * as sharedEnv from './shared-environment';
 import * as util from './util';
 
 type UploadMode = 'actions' | 'cli';
@@ -122,7 +124,7 @@ export interface UploadStatusReport {
 // depending on what the path happens to refer to.
 // Returns true iff the upload occurred and succeeded
 export async function upload(
-  sarifFile: string,
+  sarifPath: string,
   repositoryNwo: RepositoryNwo,
   commitOid: string,
   ref: string,
@@ -137,16 +139,16 @@ export async function upload(
   logger: Logger): Promise<UploadStatusReport> {
 
   const sarifFiles: string[] = [];
-  if (fs.lstatSync(sarifFile).isDirectory()) {
-    fs.readdirSync(sarifFile)
+  if (fs.lstatSync(sarifPath).isDirectory()) {
+    fs.readdirSync(sarifPath)
       .filter(f => f.endsWith(".sarif"))
-      .map(f => path.resolve(sarifFile, f))
+      .map(f => path.resolve(sarifPath, f))
       .forEach(f => sarifFiles.push(f));
     if (sarifFiles.length === 0) {
-      throw new Error("No SARIF files found to upload in \"" + sarifFile + "\".");
+      throw new Error("No SARIF files found to upload in \"" + sarifPath + "\".");
     }
   } else {
-    sarifFiles.push(sarifFile);
+    sarifFiles.push(sarifPath);
   }
 
   return await uploadFiles(
@@ -215,6 +217,15 @@ async function uploadFiles(
 
   logger.info("Uploading sarif files: " + JSON.stringify(sarifFiles));
 
+  if (mode === 'actions') {
+    // This check only works on actions as env vars don't persist between calls to the CLI
+    const sentinelEnvVar = "CODEQL_UPLOAD_SARIF";
+    if (process.env[sentinelEnvVar]) {
+      throw new Error("Aborting upload: only one run of the codeql/analyze or codeql/upload-sarif actions is allowed per job");
+    }
+    core.exportVariable(sentinelEnvVar, sentinelEnvVar);
+  }
+
   // Validate that the files we were asked to upload are all valid SARIF files
   for (const file of sarifFiles) {
     validateSarifFileSchema(file, logger);
@@ -239,6 +250,7 @@ async function uploadFiles(
       "workflow_run_id": workflowRunID,
       "checkout_uri": checkoutURI,
       "environment": environment,
+      "started_at": process.env[sharedEnv.CODEQL_WORKFLOW_STARTED_AT],
       "tool_names": toolNames,
     });
   } else {
@@ -253,11 +265,11 @@ async function uploadFiles(
 
   // Log some useful debug info about the info
   const rawUploadSizeBytes = sarifPayload.length;
-  console.debug("Raw upload size: " + rawUploadSizeBytes + " bytes");
+  logger.debug("Raw upload size: " + rawUploadSizeBytes + " bytes");
   const zippedUploadSizeBytes = zipped_sarif.length;
-  console.debug("Base64 zipped upload size: " + zippedUploadSizeBytes + " bytes");
+  logger.debug("Base64 zipped upload size: " + zippedUploadSizeBytes + " bytes");
   const numResultInSarif = countResultsInSarif(sarifPayload);
-  console.debug("Number of results in upload: " + numResultInSarif);
+  logger.debug("Number of results in upload: " + numResultInSarif);
 
   // Make the upload
   await uploadPayload(payload, repositoryNwo, githubAuth, githubApiUrl, mode, logger);
diff --git a/webpack.config.js b/webpack.config.js
index c1e632e97..79fa19747 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -16,11 +16,10 @@ module.exports = {
     extensions: [ '.ts', '.js' ],
   },
   output: {
-    filename: 'cli.js',
+    filename: 'code-scanning-cli.js',
     path: path.resolve(__dirname, 'cli'),
   },
   optimization: {
-		// We no not want to minimize our code.
 		minimize: false
 	},
 };