diff --git a/src/cli/commands/add.ts b/src/cli/commands/add.ts
index ebb8c70..92f93b1 100644
--- a/src/cli/commands/add.ts
+++ b/src/cli/commands/add.ts
@@ -34,12 +34,18 @@ export async function runAdd(opts: AddOptions): Promise<string> {
   // Load config early so we can check trust before any network work
   const config = await loadConfig(configPath);
 
-  // Validate trust before resolution
-  validateTrustedSource(specifier, config.trust);
-
   // Parse the specifier
   const parsed = parseSource(specifier);
 
+  // Normalize GitHub URLs to owner/repo form for storage
+  const canonicalSource =
+    parsed.type === "github"
+      ? `${parsed.owner}/${parsed.repo}${parsed.ref ? `@${parsed.ref}` : ""}`
+      : specifier;
+
+  // Validate trust against the canonical source (owner/repo form for GitHub)
+  validateTrustedSource(canonicalSource, config.trust);
+
   // Determine ref (flag overrides inline @ref)
   const effectiveRef = ref ?? parsed.ref;
 
@@ -49,13 +55,13 @@ export async function runAdd(opts: AddOptions): Promise<string> {
       throw new AddError("Cannot use --all with --name. Use one or the other.");
     }
 
-    if (config.skills.some((s) => isWildcardDep(s) && s.source === specifier)) {
+    if (config.skills.some((s) => isWildcardDep(s) && s.source === canonicalSource)) {
       throw new AddError(
-        `A wildcard entry for "${specifier}" already exists in agents.toml.`,
+        `A wildcard entry for "${canonicalSource}" already exists in agents.toml.`,
       );
     }
 
-    await addWildcardToConfig(configPath, specifier, {
+    await addWildcardToConfig(configPath, canonicalSource, {
       ...(effectiveRef ? { ref: effectiveRef } : {}),
       exclude: [],
     });
@@ -96,8 +102,8 @@ export async function runAdd(opts: AddOptions): Promise<string> {
       const found = await discoverSkill(cached.repoDir, nameOverride);
       if (!found) {
         throw new AddError(
-          `Skill "${nameOverride}" not found in ${specifier}. ` +
-            `Use 'dotagents add ${specifier}' without --name to see available skills.`,
+          `Skill "${nameOverride}" not found in ${canonicalSource}. ` +
+            `Use 'dotagents add ${canonicalSource}' without --name to see available skills.`,
         );
       }
       skillName = nameOverride;
@@ -105,7 +111,7 @@ export async function runAdd(opts: AddOptions): Promise<string> {
       // Discover all skills and pick
       const skills = await discoverAllSkills(cached.repoDir);
       if (skills.length === 0) {
-        throw new AddError(`No skills found in ${specifier}.`);
+        throw new AddError(`No skills found in ${canonicalSource}.`);
       }
       if (skills.length === 1) {
         skillName = skills[0]!.meta.name;
@@ -113,7 +119,7 @@ export async function runAdd(opts: AddOptions): Promise<string> {
         // Multiple skills found — list them and ask user to pick with --name or --all
         const names = skills.map((s) => s.meta.name).sort();
         throw new AddError(
-          `Multiple skills found in ${specifier}: ${names.join(", ")}. ` +
+          `Multiple skills found in ${canonicalSource}: ${names.join(", ")}. ` +
             `Use --name to specify which one, or --all for all skills.`,
         );
       }
@@ -129,7 +135,7 @@ export async function runAdd(opts: AddOptions): Promise<string> {
 
   // Add to config
   await addSkillToConfig(configPath, skillName, {
-    source: specifier,
+    source: canonicalSource,
     ...(effectiveRef ? { ref: effectiveRef } : {}),
   });
 
diff --git a/src/config/schema.test.ts b/src/config/schema.test.ts
index 3a37de4..633689b 100644
--- a/src/config/schema.test.ts
+++ b/src/config/schema.test.ts
@@ -131,6 +131,22 @@ describe("agentsConfigSchema", () => {
     it("rejects three-part path (not a valid format)", () => {
       expect(parseSkill("a/b/c").success).toBe(false);
     });
+
+    it("accepts GitHub HTTPS URL", () => {
+      expect(parseSkill("https://github.com/owner/repo").success).toBe(true);
+    });
+
+    it("accepts GitHub HTTPS URL with .git suffix", () => {
+      expect(parseSkill("https://github.com/owner/repo.git").success).toBe(true);
+    });
+
+    it("accepts GitHub SSH URL", () => {
+      expect(parseSkill("git@github.com:owner/repo.git").success).toBe(true);
+    });
+
+    it("rejects GitHub URL with dash-prefixed owner", () => {
+      expect(parseSkill("https://github.com/-bad/repo").success).toBe(false);
+    });
   });
 
   describe("skill name validation", () => {
diff --git a/src/config/schema.ts b/src/config/schema.ts
index 4c14646..4235ae4 100644
--- a/src/config/schema.ts
+++ b/src/config/schema.ts
@@ -9,6 +9,13 @@ import { z } from "zod/v4";
  */
 const GIT_URL_VALID = /^git:(https:\/\/|git:\/\/|ssh:\/\/|git@|file:\/\/|\/)/;
 
+/** GitHub HTTPS URL pattern — owner/repo must start with alphanumeric (no dash prefix). */
+export const GITHUB_HTTPS_URL =
+  /^https?:\/\/github\.com\/([a-zA-Z0-9][^/]*)\/([a-zA-Z0-9][^/@]*?)(?:\.git)?(?:\/)?(?:@(.+))?$/;
+/** GitHub SSH URL pattern — owner/repo must start with alphanumeric (no dash prefix). */
+export const GITHUB_SSH_URL =
+  /^git@github\.com:([a-zA-Z0-9][^/]*)\/([a-zA-Z0-9][^/@]*?)(?:\.git)?(?:@(.+))?$/;
+
 const skillSourceSchema = z.string().check(
   z.refine((s) => {
     if (s.startsWith("git:")) {
@@ -16,11 +23,14 @@ const skillSourceSchema = z.string().check(
       return GIT_URL_VALID.test(s);
     }
     if (s.startsWith("path:")) return true;
+    // GitHub HTTPS or SSH URLs
+    if (GITHUB_HTTPS_URL.test(s)) return true;
+    if (GITHUB_SSH_URL.test(s)) return true;
     // owner/repo or owner/repo@ref
     const base = s.includes("@") ? s.slice(0, s.indexOf("@")) : s;
     const parts = base.split("/");
     return parts.length === 2 && parts.every((p) => p.length > 0 && !p.startsWith("-"));
-  }, "Must be owner/repo, owner/repo@ref, git:<url> (with https/git/ssh protocol), or path:<relative>"),
+  }, "Must be owner/repo, owner/repo@ref, GitHub URL, git:<url> (with https/git/ssh protocol), or path:<relative>"),
 );
 
 export type SkillSource = z.infer<typeof skillSourceSchema>;
diff --git a/src/skills/resolver.test.ts b/src/skills/resolver.test.ts
index 739a544..7cd5ba4 100644
--- a/src/skills/resolver.test.ts
+++ b/src/skills/resolver.test.ts
@@ -39,4 +39,79 @@ describe("parseSource", () => {
     expect(result.type).toBe("local");
     expect(result.path).toBe("../shared/my-skill");
   });
+
+  it("parses HTTPS GitHub URL", () => {
+    const result = parseSource("https://github.com/getsentry/skills");
+    expect(result.type).toBe("github");
+    expect(result.owner).toBe("getsentry");
+    expect(result.repo).toBe("skills");
+    expect(result.url).toBe("https://github.com/getsentry/skills.git");
+    expect(result.ref).toBeUndefined();
+  });
+
+  it("parses HTTPS GitHub URL with .git suffix", () => {
+    const result = parseSource("https://github.com/getsentry/skills.git");
+    expect(result.type).toBe("github");
+    expect(result.owner).toBe("getsentry");
+    expect(result.repo).toBe("skills");
+    expect(result.url).toBe("https://github.com/getsentry/skills.git");
+  });
+
+  it("parses HTTPS GitHub URL with trailing slash", () => {
+    const result = parseSource("https://github.com/getsentry/skills/");
+    expect(result.type).toBe("github");
+    expect(result.owner).toBe("getsentry");
+    expect(result.repo).toBe("skills");
+  });
+
+  it("parses HTTPS GitHub URL with @ref", () => {
+    const result = parseSource("https://github.com/getsentry/skills@v1.0.0");
+    expect(result.type).toBe("github");
+    expect(result.owner).toBe("getsentry");
+    expect(result.repo).toBe("skills");
+    expect(result.ref).toBe("v1.0.0");
+    expect(result.url).toBe("https://github.com/getsentry/skills.git");
+  });
+
+  it("parses SSH GitHub URL", () => {
+    const result = parseSource("git@github.com:getsentry/skills");
+    expect(result.type).toBe("github");
+    expect(result.owner).toBe("getsentry");
+    expect(result.repo).toBe("skills");
+    expect(result.url).toBe("https://github.com/getsentry/skills.git");
+    expect(result.ref).toBeUndefined();
+  });
+
+  it("parses SSH GitHub URL with .git suffix", () => {
+    const result = parseSource("git@github.com:getsentry/skills.git");
+    expect(result.type).toBe("github");
+    expect(result.owner).toBe("getsentry");
+    expect(result.repo).toBe("skills");
+    expect(result.url).toBe("https://github.com/getsentry/skills.git");
+  });
+
+  it("parses SSH GitHub URL with @ref", () => {
+    const result = parseSource("git@github.com:getsentry/skills@v2.0");
+    expect(result.type).toBe("github");
+    expect(result.owner).toBe("getsentry");
+    expect(result.repo).toBe("skills");
+    expect(result.ref).toBe("v2.0");
+    expect(result.url).toBe("https://github.com/getsentry/skills.git");
+  });
+
+  it("parses HTTPS GitHub URL with dotted repo name", () => {
+    const result = parseSource("https://github.com/vercel/next.js");
+    expect(result.type).toBe("github");
+    expect(result.owner).toBe("vercel");
+    expect(result.repo).toBe("next.js");
+    expect(result.url).toBe("https://github.com/vercel/next.js.git");
+  });
+
+  it("parses HTTPS GitHub URL with dotted repo name and .git suffix", () => {
+    const result = parseSource("https://github.com/vercel/next.js.git");
+    expect(result.type).toBe("github");
+    expect(result.owner).toBe("vercel");
+    expect(result.repo).toBe("next.js");
+    expect(result.url).toBe("https://github.com/vercel/next.js.git");
+  });
 });
diff --git a/src/skills/resolver.ts b/src/skills/resolver.ts
index 3d63374..73353e0 100644
--- a/src/skills/resolver.ts
+++ b/src/skills/resolver.ts
@@ -1,5 +1,6 @@
 import { join } from "node:path";
 import type { WildcardSkillDependency } from "../config/schema.js";
+import { GITHUB_HTTPS_URL, GITHUB_SSH_URL } from "../config/schema.js";
 import { ensureCached } from "../sources/cache.js";
 import { resolveLocalSource } from "../sources/local.js";
 import { discoverSkill, discoverAllSkills } from "./discovery.js";
@@ -56,6 +57,20 @@ export function parseSource(source: string): {
     return { type: "git", url: source.slice(4) };
   }
 
+  // GitHub HTTPS or SSH URL
+  const githubUrlMatch =
+    source.match(GITHUB_HTTPS_URL) || source.match(GITHUB_SSH_URL);
+  if (githubUrlMatch) {
+    const [, owner, repo, ref] = githubUrlMatch;
+    return {
+      type: "github",
+      owner,
+      repo,
+      ref,
+      url: `https://github.com/${owner}/${repo}.git`,
+    };
+  }
+
   // owner/repo or owner/repo@ref
   const atIdx = source.indexOf("@");
   const base = atIdx !== -1 ? source.slice(0, atIdx) : source;