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fix(cli): agent register refuses to rotate an existing token without --rotate; MCP survives failed startup registration - #1921
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… create-only (#1920) When the desktop socket is unavailable, an agent had no safe way to use its own identity: `agent register` was documented as create-or-rotate. - `agent token --current` uses the token the session already holds (--from-file, --token, or RELAY_AGENT_TOKEN), verifies it read-only with agents.me(), and never prints, mints, or rotates it. --out writes a new 0600 file; `--from-file <f> -- <cmd>` runs the next command with RELAY_AGENT_TOKEN set. - `agent register` is create-only; an existing name fails with guidance and keeps its token. --rotate is the explicit opt-in. --strict is a hidden no-op alias. - `agent-relay mcp` no longer exits before the MCP handshake when startup registration fails (existing name on a create-only server, unreachable Relaycast). That exit is Claude Code's "Connection closed". - Agent-scoped message commands without a token explain the safe options instead of surfacing the internal SDK error. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughAgent registration now creates identities without rotating existing tokens by default. Explicit rotation handles name conflicts. MCP stdio startup continues without an identity after registration failures, reports a redacted reason, and returns that reason from identity-scoped tools until registration succeeds. ChangesAgent identity and MCP startup
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant startAgentRelayMcpStdio
participant resolveStdioBootstrapOptionsOrDegrade
participant stderr
participant MCPServer
participant IdentityScopedTool
startAgentRelayMcpStdio->>resolveStdioBootstrapOptionsOrDegrade: Resolve startup registration
resolveStdioBootstrapOptionsOrDegrade->>stderr: Write redacted failure reason
resolveStdioBootstrapOptionsOrDegrade-->>startAgentRelayMcpStdio: Return options without agent token and with failure reason
startAgentRelayMcpStdio->>MCPServer: Start stdio server
IdentityScopedTool->>MCPServer: Request identity-scoped operation
MCPServer-->>IdentityScopedTool: Return failure reason and register_agent guidance
Merge Risk: 🔵 Low · up to Registration timeouts no longer prevent MCP startup, but users still lack instructions for the reported longer-timeout recovery path. This is a bounded follow-up rather than a merge blocker. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
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Review comments at @CHANGELOG.md:
- Line 8: Update the [Unreleased] heading in the changelog to include the
appropriate release level, using one of the required Patch, Minor, or Major
labels; classify the pending changes according to the project’s release policy.
Review comments at @packages/cli/src/cli/agent-relay-mcp.ts:
- Line 1836: Update the registration-failure handling around
safeRelayErrorMessage so error text is redacted for workspace keys and tokens
before it is stored, written to stderr, or included in tool errors;
alternatively, use a fixed failure category instead of exposing the original
error text.
Review comments at @packages/cli/src/cli/commands/agent.ts:
- Around line 54-59: Update the `defaultRunWithEnv` exit handler to preserve
signal-terminated child status by resolving to the shell convention of 128 plus
the signal number, falling back to 1 when the signal cannot be mapped. Keep
numeric exit codes unchanged; do not add signal forwarding, which is outside
this requested change.
- Around line 273-278: Update the name-mismatch check in the agent command to
use isCurrentIdentityName with the verified name, so it applies the same
trimming, leading-@ removal, and case-insensitive comparison; retain the
existing warning when the names do not match.
Review comments at @packages/cli/src/cli/lib/agent-token-file.ts:
- Around line 56-80: Update readAgentTokenFile to open the resolved path once,
then perform the regular-file and permission checks with fstatSync and read the
token through that same file descriptor. Preserve the existing error behavior
and ensure the descriptor is closed on every path.
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CHANGELOG.mdpackages/cli/README.mdpackages/cli/src/cli/agent-relay-mcp.startup.test.tspackages/cli/src/cli/agent-relay-mcp.tspackages/cli/src/cli/bootstrap.test.tspackages/cli/src/cli/commands/agent.test.tspackages/cli/src/cli/commands/agent.tspackages/cli/src/cli/commands/relaycast-groups.test.tspackages/cli/src/cli/lib/agent-token-file.tspackages/cli/src/cli/lib/sdk-command.tspackages/cli/src/cli/mcp/types.ts
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Per the narrowed scope: #1920's root cause was desktop socket latency (relay-desktop#333), and the documented fallback is the same socket with a longer timeout, so the CLI current-identity token path is not needed. - Drop `agent token --current`, its token-file helper, and the message command missing-token guidance that pointed at it. - Keep `agent register` create-only with an explicit `--rotate`; its guidance now points at the existing token, socket, or MCP tools. - Keep the MCP startup-degrade fix: published 13.1.5 still exits before `initialize` on an existing name or unreachable Relaycast. - Redact tokens, workspace keys, JWTs, bearer values, and URL credentials from the MCP startup reason, and stop reporting it once register_agent succeeds. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Inline comments:
Review comments at @packages/cli/README.md:
- Around line 523-525: Update the README guidance for reusing an existing
session identity to document the supported longer-timeout invocation for the
Agent Relay desktop session socket, or link to its instructions. Cover the
fallback when the socket times out and no RELAY_AGENT_TOKEN is available,
without suggesting re-registration.
Review comments at @packages/cli/src/cli/lib/redact-credentials.ts:
- Around line 11-12: Update the redaction logic in redactCredentials to redact
values of credential-bearing URL query parameters, including api_key, while
preserving the surrounding URL. Add a test covering a URL such as
https://host/path?api_key=opaque-secret and verify the secret is redacted.
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CHANGELOG.mdpackages/cli/README.mdpackages/cli/src/cli/agent-relay-mcp.startup.test.tspackages/cli/src/cli/agent-relay-mcp.tspackages/cli/src/cli/commands/agent.test.tspackages/cli/src/cli/commands/agent.tspackages/cli/src/cli/commands/relaycast-groups.test.tspackages/cli/src/cli/lib/redact-credentials.ts
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Reuse the shared cloud redactor for every live-credential prefix, and also redact test-mode tokens, JWTs, bearer values, URL userinfo, credential query parameters, and every declared key (including workspaceKey and short values). Split the MCP changelog bullet. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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…-conflict predicate Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Review comments at @packages/cli/src/cli/lib/redact-credentials.ts:
- Line 18: Update the credential-redaction pattern list containing the Bearer
regex to mask Basic authorization values and quoted JSON credential fields
before generic key/value matching; add regression cases for both formats.
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Refs #1920.
Scope
The root cause of #1920 was latency, not a failed desktop socket.
GET /agentstook about 26 s because each request ran session discovery, which waited on Codex IPC. relay-desktop#333 fixes that, and the documented fallback is now the same socket with a 60 s timeout. Many users don't have the npmagent-relayCLI, so this PR no longer adds a CLI token path. An earlier revision addedagent token --current, and that has been removed.This PR keeps two changes:
agent-relay agent registerno longer rotates an existing identity's token unless you pass--rotate.agent-relay mcpstdio server survives a failed startup registration. I checked whether 13.x already fixes this (evidence below). It doesn't, so the fix stays.1. Rotation guard on
agent registerregisteris create-only. It always makes one strict registration call. If the name already exists, the command fails, says the token was left unchanged, and points to the non-rotating options: keep using the existingRELAY_AGENT_TOKEN, the desktop session socket, or the MCP tools. It also says not to re-register the name.--rotateis the explicit opt-in. It warns when the target is this session's ownRELAY_AGENT_NAME. If the server refuses the rotation, the error says the token was left unchanged.--strictis still accepted as a hidden no-op so existing scripts keep working. Combining it with--rotateis rejected.registerandagent rotatehelp text now describe the disconnect a rotation causes.Why refuse by default instead of
--no-rotatewith a warning: current Relaycast already rejects an existing name. Since relaycast#349,POST /v1/agentsreturns409 agent_already_exists, and the SDK'sregisterOrRotateno longer rotates. So on current servers the default was already "fail", and refusing breaks no existing user. The only place behaviour changes is an older server or SDK (@relaycast/sdk^8.0.7still allows those). There, silent rotation is the hazard this PR removes: it disconnects whichever session holds the old token. A warning-only mode would keep that hazard on exactly those setups.Release level:
[Unreleased - Major]. On current servers the stricter default changes nothing, because they already reject an existing name. But it changes the documented contract ofagent register(it used to rotate by default), so a script written against older servers breaks unless it adds--rotate. The release level only goes up, so if maintainers count this as a fix it can't be lowered later; call that out before cutting the release.2. MCP "Connection closed" is still present in 13.x
agent-relay mcpruns startup registration before it connects stdio, and any failure there exits the process before it answersinitialize. Claude Code reports that as "Connection closed".Probe method: spawn the server with an isolated
HOME, sendinitializeover stdio, and point it at either a local stub that returns409 agent_already_existsor an unreachable base URL.agent-relay@13.1.5(currentlatest)initializeresult (RelayError: Agent "probe" already exists)initializeresult (fetch failed)initialize, still running after 6 sinitialize, still running after 6 s12.4.0 behaved the same as 13.1.5 in an earlier run.
The fix:
@agent-relay/cloudredactor. Test-mode tokens and keys, JWTs,Bearervalues, URL userinfo, and credential query parameters (api_key=,token=, and similar) are removed too, as are the configured workspace key, API key, and agent token at any length.Not registered: startup registration failed (…). Call "register_agent" to retry.untilregister_agentsucceeds. After that, the startup reason is no longer reported.Tests
commands/agent.test.ts:--rotate, including the session's own identity, with the explanation and no token in the output--rotaterotates, and warns for the session's own identity--strictalias, and--strictwith--rotateagent-relay-mcp.startup.test.ts:connect()register_agentsucceedsrelaycast-groups.test.ts:registernow calls withstrict: true.ci-standalone-smokeunder full-suite load; that test passes on its own on both this branch and main.Not changed: the vendored prpm skills (
.agents/skills/orchestrating-agent-relayand similar) still showagent register <name> | grep at_live_. On current servers that only works the first time. They need an upstream skill update.🤖 Generated with Claude Code
Note
Medium Risk
Changes agent identity registration semantics (breaking for scripts that relied on silent rotation) and alters MCP startup/auth behavior, though credentials are redacted and rotation is now explicit.
Overview
agent-relay agent registeris now create-only by default. Re-registering an existing name fails and leaves that identity’s token unchanged;--rotateis the explicit opt-in to replace the token (with warnings when rotating this session’s ownRELAY_AGENT_NAME).--strictremains as a hidden no-op for older scripts and cannot be combined with--rotate.agent rotatesurfaces create-only server refusals clearly.agent-relay mcpno longer exits before the MCP handshake when startup registration fails (name conflict, unreachable Relaycast, etc.). It starts without an agent identity, logs a redacted reason to stderr, and identity-scoped tools return that failure untilregister_agentsucceeds. A sharedredactCredentialshelper andisAgentNameConflictsupport stderr/tool messaging.Docs and changelog mark this as a major contract change for
registeron older servers that still rotated silently.Reviewed by Cursor Bugbot for commit 28f414e. Bugbot is set up for automated code reviews on this repo. Configure here.