every brief the platform writes, where both harnesses will find it

opencode discovers AGENTS.md and nothing else — its only target is
H.up({targets:["AGENTS.md"]}), verified in the binary. claude code discovers
CLAUDE.md. no overlap.

every brief the platform wrote was CLAUDE.md, so under opencode a commander got
none of its standing brief, a bot none of its arming instructions, and a plugin
chat none of its plugin's guidance. nothing failed and nothing was logged: the
agent simply knew nothing, which is indistinguishable from the feature not
existing, and is why it lasted this long. commanders can already run under
opencode, so this was live.

writeAgentBrief puts the content in AGENTS.md and a POINTER in CLAUDE.md. a
pointer rather than two copies because these are rewritten every turn, two
copies of that will eventually disagree, and the stale one is the one somebody
reads.

three writers, and the third needed a flag the others must not have:

  bots          rewritten every turn ON PURPOSE, so a template change reaches them
  plugin chats  same
  commanders    onlyIfAbsent — a commander EXTENDS this file over its life, and
                rewriting it when the template changed would delete the job it
                had agreed with the owner

two things that would have quietly defeated it. the file listing handed to a
commander said "CLAUDE.md — this file", which would have had it editing the
pointer. and backfill-commander-credentials appended to CLAUDE.md, which on a
new commander means burying a credential section inside six lines nobody reads —
it targets AGENTS.md where one exists, CLAUDE.md where it does not, so old
commanders still work.

plugins ship these too: email and proxy-manager's chat/CLAUDE.md are now
chat/AGENTS.md. the platform accepts BOTH source names, because a plugin is its
own repository on its own release cadence and dropping the old name would
un-brief any installed copy that had not updated — silently, again.

tested: both files written, pointer is not a second copy, idempotent, rewrites
on change, and onlyIfAbsent leaves an extended brief alone. verified on disk
after a restart.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Officer-Session: 656f5c85-e49a-4f1f-b9f3-042a04b4d043

src/servers/api/command-hq/directory.ts

@@ -1,4 +1,5 @@
 import { mkdirSync, writeFileSync } from 'node:fs';
+import { writeAgentBrief } from '@@/agent-brief';
 import { getUserByEmail } from 'officerdb';
 import { lookupOsUser } from '@@/os-user';
 import { join } from 'node:path';
@@ -10,10 +11,11 @@ import { writeCommanderCredential } from './credential';
   A commander's own directory, created once, up front — `docs/commander-directory.md`.
 
   $DATA_PATH/<email>/commanders/<dirName>/
-    CLAUDE.md   written here, extended by the commander as the job is agreed
+    AGENTS.md   written here, extended by the commander as the job is agreed
+    CLAUDE.md   a pointer at it, so both harnesses discover the same brief
     state/      INSTANCE data: what it spawned, its loop's pid. Empty at creation.
 
-  Both exist before the first turn spawns, which is the whole point: Claude Code reads a CLAUDE.md from the
+  Both exist before the first turn spawns, which is the whole point: a coding CLI reads its brief from the
   working directory at session start, so a commander told about itself here needs no per-turn injection —
   see the deleted `commander-block.ts` for what this replaced.
 */
@@ -365,7 +367,8 @@ export function commanderClaudeMd(params: CommanderClaudeMdParams): string {
     'something broken.',
     '',
     '```',
-    "CLAUDE.md                this file. the platform's. never edited.",
+    "AGENTS.md                this file. the platform's, extended by you as the job is agreed.",
+    "CLAUDE.md                a pointer at AGENTS.md. the platform's. never edited.",
     'JOB.md                   what was agreed: what you watch for and what you do. yours, written once',
     '                         the job is settled and kept true after that.',
     'CLASSIFICATION.md        the category rules, if it classifies. yours, and expected to change.',
@@ -671,8 +674,14 @@ export async function createCommanderDirectory(
     credentialError = err instanceof Error ? err.message : 'could not mint a credential';
   }
 
-  writeFileSync(
-    join(dir, 'CLAUDE.md'),
+  // AGENTS.md with the brief in it, CLAUDE.md pointing at it — both, because opencode discovers only
+  // the first and Claude Code only the second, and a commander can run under either.
+  //
+  // `onlyIfAbsent`, and that flag is the whole reason this is not the same call the bots make: a
+  // commander EXTENDS this file over its life. Rewriting it when the template changes would delete the
+  // job it had agreed with the owner.
+  await writeAgentBrief(
+    dir,
     commanderClaudeMd({
       name: params.name,
       referencePath: params.referencePath,
@@ -680,6 +689,7 @@ export async function createCommanderDirectory(
       spawnedPath: spawnedRecordPath(email, dirName),
       credentialPath,
     }),
+    { onlyIfAbsent: true },
   );
 
   // Last, so it covers CLAUDE.md, officer.env and state/ as well as the directory itself.