diff --git a/backend/src/routes/workspaces.ts b/backend/src/routes/workspaces.ts
index 3ce75baa..f08e2559 100644
--- a/backend/src/routes/workspaces.ts
+++ b/backend/src/routes/workspaces.ts
@@ -56,6 +56,8 @@ const bundleManifest = z.object({
   }).strict(),
 }).strict();
 
+// Public P1 bundles contain only the descriptor and derived docs. Evidence file bytes remain
+// revision-owned Git content for the later P6 materialization boundary.
 const BUNDLE_FILES = ["manifest.json", "workspace.yaml", "contract.env.example", "README.md"] as const;
 type BundleFile = (typeof BUNDLE_FILES)[number];
 
@@ -298,6 +300,7 @@ export function workspaceRoutes(app: FastifyInstance, deps: WorkspaceRoutesDeps)
           displayName: workspace.workspace.name,
           description: workspace.workspace.description,
           language: workspace.workspace.language,
+          workspace,
           revision,
         };
       }));
diff --git a/backend/src/workspaces/contracts.ts b/backend/src/workspaces/contracts.ts
index 9722a2bc..8b25998c 100644
--- a/backend/src/workspaces/contracts.ts
+++ b/backend/src/workspaces/contracts.ts
@@ -177,6 +177,72 @@ function localizedIntroduction(workspace: WorkspaceDescriptor): string {
     : `Installation setup for ${workspace.workspace.name}. Configure only the bindings supported by this installation.`;
 }
 
+function evidenceDocumentation(
+  workspace: WorkspaceDescriptor,
+  variables: readonly InstallationVariable[],
+): string[] {
+  if (!("evidence" in workspace) || workspace.evidence === undefined) return [];
+  const { source, policy } = workspace.evidence;
+  const common = [
+    "## Evidence source",
+    "",
+    `- Type: \`${source.type}\``,
+  ];
+  let details: string[];
+  if (source.type === "filesystem") {
+    details = [
+      `- URI: \`${source.uri}\``,
+      `- Patterns: ${source.patterns.map((pattern) => `\`${pattern}\``).join(", ")}`,
+      `- Maximum source bytes: \`${source.max_bytes}\``,
+      "- Ownership: the descriptor and its Evidence tree are owned by the same Git revision.",
+      "- Materialization: P6 materializes that revision-pinned tree and verifies real containment, including symlink safety.",
+      "- Export boundary: the browser/API ZIP does not include Evidence file bytes.",
+    ];
+  } else if (source.type === "http") {
+    details = [
+      "- URIs:",
+      ...source.uris.map((uri) => `  - \`${uri}\``),
+      `- Authentication: \`${source.authentication}\`. ${source.authentication === "none"
+        ? "No credential file is required."
+        : "Provide the signed URL file through the installation file variable listed below."}`,
+      `- Connect timeout (ms): \`${source.connect_timeout_ms}\``,
+      `- Read timeout (ms): \`${source.read_timeout_ms}\``,
+      `- Maximum source bytes: \`${source.max_bytes}\``,
+      `- Maximum redirects: \`${source.max_redirects}\``,
+      `- Private hosts allowed: \`${source.allow_private_hosts}\``,
+      `- Maximum cache bytes: \`${source.max_cache_bytes}\``,
+    ];
+  } else {
+    details = [
+      `- URI: \`${source.uri}\``,
+      ...(source.endpoint_url === undefined ? [] : [`- Endpoint URL: \`${source.endpoint_url}\``]),
+      ...(source.region === undefined ? [] : [`- Region: \`${source.region}\``]),
+      `- Credentials: \`${source.credentials}\`. ${source.credentials === "ambient"
+        ? "Use ambient credentials; no Evidence credential file is required."
+        : "Provide credentials through the installation file variables listed below."}`,
+      `- Trusted endpoint: \`${source.trusted_endpoint}\``,
+      `- Private endpoint allowed: \`${source.allow_private_endpoint}\``,
+      `- Insecure endpoint allowed: \`${source.allow_insecure_endpoint}\``,
+      `- Maximum source bytes: \`${source.max_bytes}\``,
+      `- Maximum objects: \`${source.max_objects}\``,
+      `- Maximum pages: \`${source.max_pages}\``,
+      `- Page size: \`${source.page_size}\``,
+    ];
+  }
+  const evidenceVariables = variables.filter(({ role }) => role === "EVIDENCE");
+  return [
+    ...common,
+    ...details,
+    `- Maximum chunk characters: \`${policy.max_chunk_chars}\``,
+    `- Retained published generations: \`${policy.retain_published_generations}\``,
+    ...(evidenceVariables.length === 0 ? [] : [
+      "- Required installation file variables:",
+      ...evidenceVariables.map(({ name }) => `  - \`${name}\``),
+    ]),
+    "",
+  ];
+}
+
 export function renderWorkspaceDocs(workspace: WorkspaceDescriptor): { envExample: string; markdown: string } {
   const descriptor = validateWorkspaceDescriptor(workspace);
   const contract = buildInstallationContract(descriptor);
@@ -213,6 +279,7 @@ export function renderWorkspaceDocs(workspace: WorkspaceDescriptor): { envExampl
       )),
       "",
     ]),
+    ...evidenceDocumentation(descriptor, contract.variables),
   ].join("\n");
 
   return { envExample, markdown };
diff --git a/backend/src/workspaces/registry.ts b/backend/src/workspaces/registry.ts
index 913785b7..3c18c011 100644
--- a/backend/src/workspaces/registry.ts
+++ b/backend/src/workspaces/registry.ts
@@ -790,6 +790,8 @@ export class WorkspaceRegistry {
   }
 
   private expectedSnapshotFiles(state: ActiveState): string[] {
+    // P1 snapshots only descriptors and derived public docs. P6 owns revision-pinned
+    // workspace-content materialization and its recursive containment checks.
     return state.revisions.flatMap((revision) => revision.state === "operational"
       ? [`${revision.id}.yaml`, `${revision.id}.env.example`, `${revision.id}.md`]
       : [`${revision.id}.yaml`]);
diff --git a/backend/test/routes-workspaces.test.ts b/backend/test/routes-workspaces.test.ts
index 083ae35d..41938a9b 100644
--- a/backend/test/routes-workspaces.test.ts
+++ b/backend/test/routes-workspaces.test.ts
@@ -1,14 +1,23 @@
+import { execFile } from "node:child_process";
 import { createHash } from "node:crypto";
 import { once } from "node:events";
 import { Buffer } from "node:buffer";
-import { expect, test, vi } from "vitest";
+import { mkdtempSync, mkdirSync, readFileSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { promisify } from "node:util";
+import { afterEach, expect, test, vi } from "vitest";
+import yauzl from "yauzl";
 import yazl from "yazl";
 import { buildApp } from "../src/app.js";
 import { loadConfig } from "../src/config.js";
 import { createProductionWorkspaceDiagnoser } from "../src/workspaces/diagnostics.js";
 import { WorkspaceRegistryError } from "../src/workspaces/git-repository.js";
-import type { WorkspaceRegistry, WorkspaceRevision } from "../src/workspaces/registry.js";
-import { renderWorkspaceDocs, serializeWorkspaceYaml, type CanonicalWorkspace, type WorkspaceV2 } from "../src/workspaces/schema.js";
+import { WorkspaceRegistry, type WorkspaceRevision } from "../src/workspaces/registry.js";
+import {
+  parseWorkspaceYaml, renderWorkspaceDocs, serializeWorkspaceYaml, validateCanonicalWorkspace,
+  type CanonicalWorkspace, type WorkspaceV2,
+} from "../src/workspaces/schema.js";
 
 const workspace: CanonicalWorkspace = {
   workspace: {
@@ -131,7 +140,7 @@ function appFor(registry: RegistryFake, diagnose = vi.fn(async () => ({ activata
   } as any);
 }
 
-function sha256(value: string): string {
+function sha256(value: string | Buffer): string {
   return createHash("sha256").update(value).digest("hex");
 }
 
@@ -419,3 +428,362 @@ test("imports an exact generated bundle only as a browser draft", async () => {
   expect(res.json()).toMatchObject({ draft: { workspace } });
   expect(registry.publish).not.toHaveBeenCalled();
 });
+
+
+const runFile = promisify(execFile);
+const realRouteRoots: string[] = [];
+
+interface RealRouteFixture {
+  root: string;
+  remote: string;
+  author: string;
+  registryRoot: string;
+  initialCommit: string;
+  app: ReturnType<typeof buildApp>;
+  registry: WorkspaceRegistry;
+}
+
+const EVIDENCE_FILE_BYTES = "PUBLIC-EVIDENCE-FILE-BYTES-NOT-FOR-ZIP\n";
+const SECRET_CANARY = "CANARY-EVIDENCE-ROUTE-SECRET-DO-NOT-LEAK";
+
+function withEvidence(
+  source: Partial<CanonicalWorkspace["evidence"]["source"]> & { type: "filesystem" | "http" | "s3" },
+  changes: Partial<CanonicalWorkspace["evidence"]["policy"]> = {},
+): CanonicalWorkspace {
+  return validateCanonicalWorkspace({
+    ...workspace,
+    evidence: { source, policy: changes },
+  });
+}
+
+const filesystemEvidenceWorkspace = withEvidence({
+  type: "filesystem", uri: "workspace-content/psd-clinical/evidence",
+});
+const httpEvidenceWorkspace = withEvidence({
+  type: "http",
+  uris: ["https://evidence.example.test/guide.md"],
+  authentication: "signed_urls_file",
+});
+
+async function realGit(cwd: string, args: string[]): Promise<string> {
+  return (await runFile("git", args, { cwd })).stdout.trim();
+}
+
+async function createRealRouteFixture(
+  initialWorkspace: CanonicalWorkspace = filesystemEvidenceWorkspace,
+): Promise<RealRouteFixture> {
+  const root = mkdtempSync(join(tmpdir(), "thoth-real-workspace-route-"));
+  realRouteRoots.push(root);
+  const remote = join(root, "remote.git");
+  const author = join(root, "author");
+  const registryRoot = join(root, "registry");
+  await realGit(root, ["init", "--bare", "--initial-branch=main", remote]);
+  mkdirSync(author);
+  await realGit(author, ["init", "--initial-branch=main"]);
+  await realGit(author, ["config", "user.name", "Workspace Route Test"]);
+  await realGit(author, ["config", "user.email", "workspace-route@example.invalid"]);
+  mkdirSync(join(author, "workspaces"));
+  writeFileSync(join(author, "workspaces", "psd-clinical.yaml"), serializeWorkspaceYaml(initialWorkspace));
+  if (initialWorkspace.evidence?.source.type === "filesystem") {
+    mkdirSync(join(author, "workspace-content", "psd-clinical", "evidence"), { recursive: true });
+    writeFileSync(
+      join(author, "workspace-content", "psd-clinical", "evidence", "guide.md"),
+      EVIDENCE_FILE_BYTES,
+    );
+  }
+  await realGit(author, ["add", "."]);
+  await realGit(author, ["commit", "-m", "Initial Evidence workspace"]);
+  await realGit(author, ["remote", "add", "origin", remote]);
+  await realGit(author, ["push", "origin", "main"]);
+  const initialCommit = await realGit(author, ["rev-parse", "HEAD"]);
+  const config = loadConfig({
+    THT_HARNESS_DIR: "/missing-harness",
+    THT_WORKSPACE_REGISTRY_ROOT: registryRoot,
+    THT_WORKSPACE_GIT_REMOTE: remote,
+    THT_WORKSPACE_GIT_AUTHOR_NAME: "Workspace Route Publisher",
+    THT_WORKSPACE_GIT_AUTHOR_EMAIL: "workspace-route-publisher@example.invalid",
+  });
+  const registry = new WorkspaceRegistry(config.workspaceRegistry);
+  const app = buildApp(config, {
+    thtRunner: {} as any,
+    workspaceRegistry: registry,
+    workspaceDiagnoser: vi.fn(async () => ({ activatable: true, diagnostics: [] })),
+  });
+  return { root, remote, author, registryRoot, initialCommit, app, registry };
+}
+
+async function extractZip(source: Buffer): Promise<Record<string, Buffer>> {
+  return await new Promise((resolve, reject) => {
+    yauzl.fromBuffer(source, { lazyEntries: true, strictFileNames: true }, (error, archive) => {
+      if (error || !archive) return reject(error ?? new Error("archive unavailable"));
+      const files: Record<string, Buffer> = {};
+      archive.on("error", reject);
+      archive.on("entry", (entry) => {
+        if (entry.fileName.startsWith("/") || entry.fileName.includes("..") || entry.fileName.includes("\\")) {
+          archive.close();
+          reject(new Error("unsafe exported path"));
+          return;
+        }
+        archive.openReadStream(entry, (streamError, stream) => {
+          if (streamError || !stream) return reject(streamError ?? new Error("entry unavailable"));
+          const chunks: Buffer[] = [];
+          stream.on("data", (chunk: Buffer) => chunks.push(chunk));
+          stream.on("error", reject);
+          stream.on("end", () => {
+            files[entry.fileName] = Buffer.concat(chunks);
+            archive.readEntry();
+          });
+        });
+      });
+      archive.on("end", () => resolve(files));
+      archive.readEntry();
+    });
+  });
+}
+
+afterEach(() => {
+  realRouteRoots.splice(0).forEach((root) => rmSync(root, { recursive: true, force: true }));
+});
+
+test.each([
+  {
+    source: { type: "filesystem", uri: "workspace-content/psd-clinical/evidence" },
+    expectedVariables: [],
+  },
+  {
+    source: {
+      type: "http", uris: ["https://evidence.example.test/guide.md"],
+      authentication: "signed_urls_file",
+    },
+    expectedVariables: ["THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE"],
+  },
+  {
+    source: { type: "s3", uri: "s3://clinical-evidence/published/", credentials: "static_files" },
+    expectedVariables: [
+      "THT_WS_PSD_CLINICAL_EVIDENCE_ACCESS_KEY_FILE",
+      "THT_WS_PSD_CLINICAL_EVIDENCE_SECRET_KEY_FILE",
+      "THT_WS_PSD_CLINICAL_EVIDENCE_SESSION_TOKEN_FILE",
+    ],
+  },
+])("real validate route canonicalizes $source.type Evidence and returns only its file contract", async ({
+  source, expectedVariables,
+}) => {
+  const fixture = await createRealRouteFixture();
+  const response = await fixture.app.inject({
+    method: "POST", url: "/workspaces/validate",
+    payload: { workspace: { ...workspace, evidence: { source } } },
+  });
+
+  expect(response.statusCode).toBe(200);
+  const body = response.json();
+  expect(body.workspace.evidence.policy).toEqual({
+    max_chunk_chars: 4_000, retain_published_generations: 3,
+  });
+  expect(body.workspace.evidence.source.max_bytes).toBe(10 * 1024 * 1024);
+  expect(body.contract.variables.filter(({ role }: { role: string }) => role === "EVIDENCE")
+    .map(({ name }: { name: string }) => name)).toEqual(expectedVariables);
+});
+
+test("real publish create/update, pull, list, and read preserve a complete Evidence descriptor", async () => {
+  const fixture = await createRealRouteFixture(httpEvidenceWorkspace);
+  const status = await fixture.app.inject({ method: "GET", url: "/workspace-registry/status" });
+  const created = validateCanonicalWorkspace({
+    ...httpEvidenceWorkspace,
+    workspace: { ...httpEvidenceWorkspace.workspace, id: "research-clinical", name: "Research Clinical" },
+    semantic_index: {
+      ...httpEvidenceWorkspace.semantic_index,
+      vector_store: { ...httpEvidenceWorkspace.semantic_index.vector_store, collection: "research-clinical" },
+    },
+  });
+  const create = await fixture.app.inject({
+    method: "POST", url: "/workspaces/publish",
+    payload: { action: "create", workspace: created, baseCommit: status.json().head },
+  });
+  const createdRevision = create.json().revision as WorkspaceRevision;
+  const updated = validateCanonicalWorkspace({
+    ...created,
+    evidence: {
+      ...created.evidence,
+      policy: { max_chunk_chars: 8_192, retain_published_generations: 7 },
+    },
+  });
+
+  const update = await fixture.app.inject({
+    method: "POST", url: "/workspaces/publish",
+    payload: {
+      action: "update", workspace: updated,
+      baseCommit: createdRevision.commit, baseBlob: createdRevision.blob,
+    },
+  });
+  const pull = await fixture.app.inject({ method: "POST", url: "/workspace-registry/pull" });
+  const list = await fixture.app.inject({ method: "GET", url: "/workspaces" });
+  const read = await fixture.app.inject({ method: "GET", url: "/workspaces/research-clinical" });
+
+  expect(status.statusCode).toBe(200);
+  expect(create.statusCode).toBe(200);
+  expect(update.statusCode).toBe(200);
+  expect(pull.statusCode).toBe(200);
+  expect(list.statusCode).toBe(200);
+  expect(list.json().find(({ id }: { id: string }) => id === "research-clinical").workspace).toEqual(updated);
+  expect(read.statusCode).toBe(200);
+  expect(read.json().workspace).toEqual(updated);
+});
+
+test("real route reports a safe field for an Evidence-only concurrent edit", async () => {
+  const fixture = await createRealRouteFixture(httpEvidenceWorkspace);
+  await fixture.registry.bootstrap();
+  const base = await fixture.registry.read("psd-clinical");
+  const remote = withEvidence(
+    { ...httpEvidenceWorkspace.evidence!.source },
+    { max_chunk_chars: 9_000, retain_published_generations: 3 },
+  );
+  writeFileSync(join(fixture.author, "workspaces", "psd-clinical.yaml"), serializeWorkspaceYaml(remote));
+  await realGit(fixture.author, ["add", "workspaces/psd-clinical.yaml"]);
+  await realGit(fixture.author, ["commit", "-m", "Change Evidence policy only"]);
+  await realGit(fixture.author, ["push", "origin", "main"]);
+  const local = withEvidence(
+    { ...httpEvidenceWorkspace.evidence!.source },
+    { max_chunk_chars: 4_000, retain_published_generations: 8 },
+  );
+
+  const response = await fixture.app.inject({
+    method: "POST", url: "/workspaces/publish",
+    payload: {
+      action: "update", workspace: local,
+      baseCommit: base.revision.commit, baseBlob: base.revision.blob,
+    },
+  });
+
+  expect(response.statusCode).toBe(409);
+  expect(response.json()).toMatchObject({
+    code: "workspace_conflict", fields: ["evidence.policy.max_chunk_chars"],
+  });
+  expect(response.body).not.toContain(SECRET_CANARY);
+});
+
+test.each([
+  ["absolute", "/tmp/CANARY-EVIDENCE-ROUTE-SECRET-DO-NOT-LEAK"],
+  ["traversal", "workspace-content/psd-clinical/../CANARY-EVIDENCE-ROUTE-SECRET-DO-NOT-LEAK"],
+  ["cross-workspace", "workspace-content/research/evidence"],
+])("real publish rejects %s filesystem Evidence paths without changing HEAD", async (_label, uri) => {
+  const fixture = await createRealRouteFixture();
+  await fixture.registry.bootstrap();
+  const base = await fixture.registry.read("psd-clinical");
+  const invalid = structuredClone(filesystemEvidenceWorkspace) as any;
+  invalid.evidence.source.uri = uri;
+
+  const response = await fixture.app.inject({
+    method: "POST", url: "/workspaces/publish",
+    payload: { action: "update", workspace: invalid, baseCommit: base.revision.commit, baseBlob: base.revision.blob },
+  });
+
+  expect(response.statusCode).toBe(400);
+  expect(response.json()).toEqual({ code: "workspace_invalid", message: "Workspace request or bundle is invalid." });
+  expect(response.body).not.toContain(SECRET_CANARY);
+  expect(await realGit(fixture.author, ["--git-dir", fixture.remote, "rev-parse", "HEAD"]))
+    .toBe(fixture.initialCommit);
+});
+
+test.each([
+  {
+    label: "credential-bearing HTTP URI",
+    source: { type: "http", uris: [`https://user:${SECRET_CANARY}@evidence.example.test/guide.md`] },
+  },
+  {
+    label: "unsupported HTTP protocol",
+    source: { type: "http", uris: [`ftp://evidence.example.test/${SECRET_CANARY}`] },
+  },
+  {
+    label: "inline S3 credential field",
+    source: { type: "s3", uri: "s3://clinical-evidence/published/", access_key: SECRET_CANARY },
+  },
+])("real validate rejects $label without echoing it", async ({ source }) => {
+  const fixture = await createRealRouteFixture();
+  const response = await fixture.app.inject({
+    method: "POST", url: "/workspaces/validate",
+    payload: { workspace: { ...workspace, evidence: { source } } },
+  });
+
+  expect(response.statusCode).toBe(400);
+  expect(response.json()).toEqual({ code: "workspace_invalid", message: "Workspace request or bundle is invalid." });
+  expect(response.body).not.toContain(SECRET_CANARY);
+  expect(await realGit(fixture.author, ["--git-dir", fixture.remote, "rev-parse", "HEAD"]))
+    .toBe(fixture.initialCommit);
+});
+
+test("real publish and pull fail safely when the contextual Evidence Git tree is missing", async () => {
+  const fixture = await createRealRouteFixture();
+  await fixture.registry.bootstrap();
+  const current = await fixture.registry.read("psd-clinical");
+  const missing = validateCanonicalWorkspace({
+    ...workspace,
+    workspace: { ...workspace.workspace, id: "missing-evidence", name: "Missing Evidence" },
+    semantic_index: {
+      ...workspace.semantic_index,
+      vector_store: { ...workspace.semantic_index.vector_store, collection: "missing-evidence" },
+    },
+    evidence: { source: { type: "filesystem", uri: "workspace-content/missing-evidence/evidence" } },
+  });
+  const publish = await fixture.app.inject({
+    method: "POST", url: "/workspaces/publish",
+    payload: { action: "create", workspace: missing, baseCommit: current.revision.commit },
+  });
+  expect(publish.statusCode).toBe(400);
+  expect(publish.json()).toEqual({ code: "workspace_invalid", message: "Workspace request or bundle is invalid." });
+  expect(await realGit(fixture.author, ["--git-dir", fixture.remote, "rev-parse", "HEAD"]))
+    .toBe(fixture.initialCommit);
+
+  rmSync(join(fixture.author, "workspace-content", "psd-clinical", "evidence"), { recursive: true });
+  await realGit(fixture.author, ["add", "-A"]);
+  await realGit(fixture.author, ["commit", "-m", "Remove Evidence tree"]);
+  await realGit(fixture.author, ["push", "origin", "main"]);
+  const pull = await fixture.app.inject({ method: "POST", url: "/workspace-registry/pull" });
+  expect(pull.statusCode).toBe(400);
+  expect(pull.json()).toEqual({ code: "workspace_invalid", message: "Workspace request or bundle is invalid." });
+  expect(pull.body).not.toContain(SECRET_CANARY);
+  await expect(fixture.registry.read("psd-clinical")).resolves.toMatchObject({
+    revision: { commit: fixture.initialCommit },
+  });
+});
+
+test("real export and import preserve stable public Evidence artifacts without Evidence or secret bytes", async () => {
+  const fixture = await createRealRouteFixture();
+  const secretDirectory = join(fixture.root, "fixture-secrets");
+  mkdirSync(secretDirectory);
+  writeFileSync(join(secretDirectory, "credential"), SECRET_CANARY);
+  await fixture.registry.bootstrap();
+
+  const firstResponse = await fixture.app.inject({ method: "GET", url: "/workspaces/psd-clinical/export" });
+  const secondResponse = await fixture.app.inject({ method: "GET", url: "/workspaces/psd-clinical/export" });
+  expect(firstResponse.statusCode).toBe(200);
+  expect(secondResponse.statusCode).toBe(200);
+  const first = await extractZip(firstResponse.rawPayload);
+  const second = await extractZip(secondResponse.rawPayload);
+  const names = ["manifest.json", "workspace.yaml", "contract.env.example", "README.md"];
+  expect(Object.keys(first).sort()).toEqual([...names].sort());
+  expect(Object.keys(second).sort()).toEqual([...names].sort());
+  for (const name of names) expect(second[name]).toEqual(first[name]);
+
+  const descriptor = parseWorkspaceYaml(first["workspace.yaml"].toString("utf8"));
+  const docs = renderWorkspaceDocs(descriptor);
+  const manifest = JSON.parse(first["manifest.json"].toString("utf8"));
+  expect(descriptor).toEqual(filesystemEvidenceWorkspace);
+  expect(first["contract.env.example"].toString("utf8")).toBe(docs.envExample);
+  expect(first["README.md"].toString("utf8")).toBe(docs.markdown);
+  expect(manifest.files).toEqual({
+    "workspace.yaml": sha256(first["workspace.yaml"]),
+    "contract.env.example": sha256(first["contract.env.example"]),
+    "README.md": sha256(first["README.md"]),
+  });
+  const publicBytes = Buffer.concat(Object.values(first)).toString("utf8");
+  expect(publicBytes).not.toContain(EVIDENCE_FILE_BYTES.trim());
+  expect(publicBytes).not.toContain(SECRET_CANARY);
+
+  const imported = await importBundle(fixture.app, firstResponse.rawPayload);
+  expect(imported.statusCode).toBe(200);
+  expect(imported.json().draft.workspace).toEqual(filesystemEvidenceWorkspace);
+  expect(imported.json().draft.contract.variables.some(({ role }: { role: string }) => role === "EVIDENCE"))
+    .toBe(false);
+  expect(imported.body).not.toContain(EVIDENCE_FILE_BYTES.trim());
+  expect(imported.body).not.toContain(SECRET_CANARY);
+});
diff --git a/backend/test/workspace-registry.test.ts b/backend/test/workspace-registry.test.ts
index 95e7913c..f0f24136 100644
--- a/backend/test/workspace-registry.test.ts
+++ b/backend/test/workspace-registry.test.ts
@@ -1,7 +1,7 @@
 import { execFile } from "node:child_process";
 import { createHash } from "node:crypto";
 import {
-  chmodSync, existsSync, mkdtempSync, mkdirSync, readFileSync, rmSync, symlinkSync, writeFileSync,
+  chmodSync, existsSync, mkdtempSync, mkdirSync, readdirSync, readFileSync, rmSync, symlinkSync, writeFileSync,
 } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
@@ -9,7 +9,9 @@ import { promisify } from "node:util";
 import { afterEach, expect, test } from "vitest";
 import { WorkspaceRepositoryLock } from "../src/workspaces/git-repository.js";
 import { WorkspaceRegistry } from "../src/workspaces/registry.js";
-import { parseWorkspaceYaml, type CanonicalWorkspace } from "../src/workspaces/schema.js";
+import {
+  parseWorkspaceYaml, renderWorkspaceDocs, serializeWorkspaceYaml, type CanonicalWorkspace,
+} from "../src/workspaces/schema.js";
 import type { WorkspaceRegistryConfig } from "../src/workspaces/types.js";
 
 const validYaml = `workspace:
@@ -988,3 +990,96 @@ test("rejects a corrupt fallback snapshot instead of returning degraded active s
 
   await expect(registry.pull()).rejects.toMatchObject({ code: "workspace_invalid" });
 });
+
+
+test("snapshots canonical Evidence artifacts at the active commit without copying Evidence bytes", async () => {
+  const remote = await fixture(withFilesystemEvidence(validYaml));
+  const registryRoot = join(remote.root, "registry");
+  const registry = new WorkspaceRegistry(config(registryRoot, remote.remote));
+
+  const status = await registry.bootstrap();
+  const active = await registry.read("psd-clinical");
+  const snapshotDirectory = join(registryRoot, "snapshots", status.head!);
+  const descriptor = active.workspace as CanonicalWorkspace;
+  const docs = renderWorkspaceDocs(descriptor);
+  const expectedFiles: Record<string, string> = {
+    "psd-clinical.yaml": serializeWorkspaceYaml(descriptor),
+    "psd-clinical.env.example": docs.envExample,
+    "psd-clinical.md": docs.markdown,
+  };
+  const manifest = JSON.parse(readFileSync(join(snapshotDirectory, "snapshot.json"), "utf8"));
+
+  expect(status.head).toBe(remote.initialCommit);
+  const committedDescriptor = parseWorkspaceYaml(await gitOutput(remote.source, [
+    "show", `${remote.initialCommit}:workspaces/psd-clinical.yaml`,
+  ])) as CanonicalWorkspace;
+  expect(expectedFiles["psd-clinical.yaml"]).toBe(serializeWorkspaceYaml(committedDescriptor));
+  expect(readdirSync(snapshotDirectory).sort()).toEqual([
+    "psd-clinical.env.example", "psd-clinical.md", "psd-clinical.yaml", "snapshot.json",
+  ]);
+  expect(manifest.head).toBe(remote.initialCommit);
+  expect(manifest.revisions[0]).toMatchObject({
+    id: "psd-clinical", commit: remote.initialCommit, blob: active.revision.blob,
+  });
+  expect(Object.keys(manifest.files).sort()).toEqual(Object.keys(expectedFiles).sort());
+  for (const [name, contents] of Object.entries(expectedFiles)) {
+    expect(readFileSync(join(snapshotDirectory, name), "utf8")).toBe(contents);
+    expect(manifest.files[name]).toBe(createHash("sha256").update(contents).digest("hex"));
+  }
+  expect(JSON.stringify(manifest)).not.toContain("workspace-content/");
+  expect(readdirSync(snapshotDirectory).some((name) => name === "workspace-content")).toBe(false);
+  expect(readFileSync(join(remote.source, "workspace-content/psd-clinical/evidence/guide.md"), "utf8"))
+    .toBe("guide v1\n");
+});
+
+test("never copies an installation secret canary into Git, generated artifacts, metadata, or errors", async () => {
+  const remote = await fixture(validYaml.concat(`evidence:
+  source:
+    type: http
+    uris: [https://evidence.example.test/guide.md]
+    authentication: signed_urls_file
+`));
+  const canary = "CANARY-EVIDENCE-SECRET-ONLY-IN-FIXTURE";
+  const secretDirectory = join(remote.root, "fixture-secrets");
+  mkdirSync(secretDirectory);
+  const secretFile = join(secretDirectory, "signed-urls");
+  writeFileSync(secretFile, canary);
+  const registryRoot = join(remote.root, "registry");
+  const registry = new WorkspaceRegistry(config(registryRoot, remote.remote, {
+    secretRoots: [secretDirectory],
+  }));
+  const previous = process.env.THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE;
+  process.env.THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE = secretFile;
+  try {
+    const status = await registry.bootstrap();
+    const snapshotDirectory = join(registryRoot, "snapshots", status.head!);
+    let gitBlobText = "";
+    try {
+      gitBlobText = (await runFile(
+        "git", ["grep", "-I", "-h", "-e", canary, "HEAD", "--", "."], { cwd: remote.source },
+      )).stdout;
+    } catch (error) {
+      if (!error || typeof error !== "object" || !("code" in error) || error.code !== 1) throw error;
+      gitBlobText = "stdout" in error ? String(error.stdout ?? "") : "";
+    }
+    expect(gitBlobText).toBe("");
+    for (const name of readdirSync(snapshotDirectory)) {
+      expect(readFileSync(join(snapshotDirectory, name), "utf8")).not.toContain(canary);
+    }
+    let thrown: unknown;
+    try {
+      await registry.publish({
+        action: "create",
+        workspace: filesystemWorkspace("missing-secret-canary-tree"),
+        baseCommit: status.head!,
+      });
+    } catch (error) {
+      thrown = error;
+    }
+    expect(thrown).toMatchObject({ code: "workspace_invalid" });
+    expect(String(thrown)).not.toContain(canary);
+  } finally {
+    if (previous === undefined) delete process.env.THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE;
+    else process.env.THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE = previous;
+  }
+});
diff --git a/backend/test/workspaces-contracts.test.ts b/backend/test/workspaces-contracts.test.ts
index 0657804b..2ac47f83 100644
--- a/backend/test/workspaces-contracts.test.ts
+++ b/backend/test/workspaces-contracts.test.ts
@@ -1,5 +1,7 @@
 import { expect, test } from "vitest";
-import { existsSync, readFileSync } from "node:fs";
+import { existsSync, mkdtempSync, mkdirSync, readFileSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
 import { fileURLToPath } from "node:url";
 import { parse } from "yaml";
 import { buildInstallationContract, renderWorkspaceDocs } from "../src/workspaces/contracts.js";
@@ -385,3 +387,115 @@ semantic_index:
 llm_policy: { allowed: [zai/glm-5.2] }
 `;
 }
+
+
+const evidenceSources = [
+  {
+    label: "filesystem",
+    source: { type: "filesystem", uri: "workspace-content/psd-clinical/evidence" },
+    variables: [],
+  },
+  {
+    label: "HTTP signed URL file",
+    source: {
+      type: "http",
+      uris: ["https://evidence.example.test/guide.md", "http://public.example.test/policy.pdf"],
+      authentication: "signed_urls_file",
+    },
+    variables: ["THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE"],
+  },
+  {
+    label: "S3 static files",
+    source: {
+      type: "s3", uri: "s3://clinical-evidence/published/", credentials: "static_files",
+    },
+    variables: [
+      "THT_WS_PSD_CLINICAL_EVIDENCE_ACCESS_KEY_FILE",
+      "THT_WS_PSD_CLINICAL_EVIDENCE_SECRET_KEY_FILE",
+      "THT_WS_PSD_CLINICAL_EVIDENCE_SESSION_TOKEN_FILE",
+    ],
+  },
+] as const;
+
+test.each(evidenceSources)("renders deterministic public Evidence docs for $label", ({ source, variables }) => {
+  const descriptor = parseWorkspaceYaml(
+    `${renderWorkspaceWithoutEvidence()}evidence:\n  source: ${JSON.stringify(source)}\n`,
+  );
+  const firstContract = buildInstallationContract(descriptor);
+  const secondContract = buildInstallationContract(descriptor);
+  const firstDocs = renderWorkspaceDocs(descriptor);
+  const secondDocs = renderWorkspaceDocs(descriptor);
+
+  expect(secondContract).toEqual(firstContract);
+  expect(secondDocs).toEqual(firstDocs);
+  expect(firstContract.variables.filter(({ role }) => role === "EVIDENCE").map(({ name }) => name))
+    .toEqual(variables);
+  expect(firstDocs.markdown).toContain("## Evidence source");
+  expect(firstDocs.markdown).toContain(`- Type: \`${source.type}\``);
+  for (const uri of "uris" in source ? source.uris : [source.uri]) {
+    expect(firstDocs.markdown).toContain(`\`${uri}\``);
+  }
+  expect(firstDocs.markdown).toContain("- Maximum source bytes: `10485760`");
+  expect(firstDocs.markdown).toContain("- Maximum chunk characters: `4000`");
+  expect(firstDocs.markdown).toContain("- Retained published generations: `3`");
+  for (const variable of variables) {
+    expect(firstDocs.markdown).toContain(`\`${variable}\``);
+    expect(firstDocs.envExample).toContain(`${variable}=`);
+  }
+});
+
+test("documents same-revision filesystem ownership without claiming P1 materialization", () => {
+  const descriptor = parseWorkspaceYaml(
+    `${renderWorkspaceWithoutEvidence()}evidence:\n  source: { type: filesystem, uri: workspace-content/psd-clinical/evidence }\n`,
+  );
+  const docs = renderWorkspaceDocs(descriptor).markdown;
+
+  expect(docs).toContain("`workspace-content/psd-clinical/evidence`");
+  expect(docs).toMatch(/same Git revision/i);
+  expect(docs).toMatch(/P6.*materializ/i);
+  expect(docs).toMatch(/containment.*symlink/i);
+  expect(docs).toMatch(/does not include Evidence file bytes/i);
+});
+
+test.each([
+  {
+    source: { type: "http", uris: ["https://evidence.example.test/guide.md"], authentication: "none" },
+    expected: "No credential file is required",
+  },
+  {
+    source: { type: "http", uris: ["https://evidence.example.test/guide.md"], authentication: "signed_urls_file" },
+    expected: "signed URL file",
+  },
+  {
+    source: { type: "s3", uri: "s3://clinical-evidence/published/", credentials: "ambient" },
+    expected: "ambient credentials",
+  },
+  {
+    source: { type: "s3", uri: "s3://clinical-evidence/published/", credentials: "static_files" },
+    expected: "installation file variables",
+  },
+])("documents $source.type credential mode without reading credential contents", ({ source, expected }) => {
+  const root = mkdtempSync(join(tmpdir(), "thoth-evidence-doc-secret-"));
+  const secrets = join(root, "secrets");
+  const canary = "CANARY-EVIDENCE-CREDENTIAL-DO-NOT-LEAK";
+  mkdirSync(secrets);
+  const binding = join(secrets, "credential");
+  writeFileSync(binding, canary);
+  const previous = process.env.THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE;
+  process.env.THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE = binding;
+  try {
+    const descriptor = parseWorkspaceYaml(
+      `${renderWorkspaceWithoutEvidence()}evidence:\n  source: ${JSON.stringify(source)}\n`,
+    );
+    const generated = JSON.stringify({
+      contract: buildInstallationContract(descriptor),
+      docs: renderWorkspaceDocs(descriptor),
+    });
+    expect(generated).toContain(expected);
+    expect(generated).not.toContain(canary);
+  } finally {
+    if (previous === undefined) delete process.env.THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE;
+    else process.env.THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE = previous;
+    rmSync(root, { recursive: true, force: true });
+  }
+});