feat: add coding-agent skill and anyBins gating

Co-authored-by: Sreekaran Srinath <ss@sreekaran.com>

src/agents/skills.test.ts

@@ -215,6 +215,12 @@ describe("buildWorkspaceSkillsPrompt", () => {
       description: "Needs a bin",
       metadata: '{"clawdis":{"requires":{"bins":["fakebin"]}}}',
     });
+    await writeSkill({
+      dir: path.join(skillsDir, "anybin-skill"),
+      name: "anybin-skill",
+      description: "Needs any bin",
+      metadata: '{"clawdis":{"requires":{"anyBins":["missingbin","fakebin"]}}}',
+    });
     await writeSkill({
       dir: path.join(skillsDir, "config-skill"),
       name: "config-skill",
@@ -242,6 +248,7 @@ describe("buildWorkspaceSkillsPrompt", () => {
       expect(defaultPrompt).toContain("always-skill");
       expect(defaultPrompt).toContain("config-skill");
       expect(defaultPrompt).not.toContain("bin-skill");
+      expect(defaultPrompt).not.toContain("anybin-skill");
       expect(defaultPrompt).not.toContain("env-skill");
 
       await fs.mkdir(binDir, { recursive: true });
@@ -258,6 +265,7 @@ describe("buildWorkspaceSkillsPrompt", () => {
         },
       });
       expect(gatedPrompt).toContain("bin-skill");
+      expect(gatedPrompt).toContain("anybin-skill");
       expect(gatedPrompt).toContain("env-skill");
       expect(gatedPrompt).toContain("always-skill");
       expect(gatedPrompt).not.toContain("config-skill");

src/agents/skills.ts

@@ -30,6 +30,7 @@ export type ClawdisSkillMetadata = {
   os?: string[];
   requires?: {
     bins?: string[];
+    anyBins?: string[];
     env?: string[];
     config?: string[];
   };
@@ -307,6 +308,7 @@ function resolveClawdisMetadata(
       requires: requiresRaw
         ? {
             bins: normalizeStringList(requiresRaw.bins),
+            anyBins: normalizeStringList(requiresRaw.anyBins),
             env: normalizeStringList(requiresRaw.env),
             config: normalizeStringList(requiresRaw.config),
           }
@@ -347,6 +349,11 @@ function shouldIncludeSkill(params: {
       if (!hasBinary(bin)) return false;
     }
   }
+  const requiredAnyBins = entry.clawdis?.requires?.anyBins ?? [];
+  if (requiredAnyBins.length > 0) {
+    const anyFound = requiredAnyBins.some((bin) => hasBinary(bin));
+    if (!anyFound) return false;
+  }
 
   const requiredEnv = entry.clawdis?.requires?.env ?? [];
   if (requiredEnv.length > 0) {