Grammarly Incident Runbook

'Follow Grammarly incident response runbook for API outages. Use when Grammarly API is down, experiencing errors, or when investigating service degradation. Trigger with phrases like "grammarly down", "grammarly outage", "grammarly incident", "grammarly not responding". '

jeremylongshore Updated Sep 8, 2026

Integrations & APIs

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Grammarly Incident Runbook

Overview

Incident response procedures for Grammarly writing API integration failures. Covers text check timeouts, suggestion quality degradation, OAuth token failures, and rate limit storms. Grammarly powers real-time writing assistance, so API incidents directly impact user-facing text checking, scoring workflows, and content quality pipelines. Classify severity immediately using the matrix below and follow the corresponding playbook.

Severity Levels

Level	Definition	Response Time	Example
P1 - Critical	Full API outage, all scoring requests fail	15 min	5xx on `/v2/scores` for all requests
P2 - High	OAuth token failures or sustained timeouts	30 min	All authenticated requests return 401
P3 - Medium	Rate limit storms or elevated latency	2 hours	429 responses, scoring takes 10s+ per request
P4 - Low	Suggestion quality drift or single endpoint issue	8 hours	Scores returning but correctness values seem off

Diagnostic Steps

# Test API health (unauthenticated)
curl -s -o /dev/null -w "HTTP %{http_code}\n" \
  https://api.grammarly.com/ecosystem/api/v2/scores

# Test authenticated scoring
curl -s -w "\nHTTP %{http_code}\n" \
  -H "Authorization: Bearer $GRAMMARLY_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  -X POST https://api.grammarly.com/ecosystem/api/v2/scores \
  -d '{"text": "Test sentence for Grammarly API diagnostic health check."}'

# Check OAuth token validity
curl -s -o /dev/null -w "HTTP %{http_code}\n" \
  -H "Authorization: Bearer $GRAMMARLY_ACCESS_TOKEN" \
  https://api.grammarly.com/ecosystem/api/v2/account

Incident Playbooks

API Outage

Confirm with unauthenticated health check (see diagnostics)
Check Grammarly status page and developer announcements
Activate fallback mode — return placeholder scores to avoid blocking users
Queue text submissions for retry when API recovers
Notify downstream consumers that scores are unavailable

Authentication Failure

Test token validity with the account endpoint diagnostic above
If 401: OAuth access token has expired — trigger token refresh flow
If refresh token also fails: re-authorize via OAuth consent flow
Verify client ID and client secret are correct in environment config
Deploy refreshed tokens and confirm scoring requests succeed

Data Sync Failure

Identify if scoring results are stale or inconsistent across requests
Check if Grammarly updated their scoring model (review changelog)
Compare current scores against known baseline text samples
If quality drift confirmed: log evidence and file support ticket
Consider pinning API version if Grammarly supports versioned endpoints

Communication Template

**Incident**: Grammarly Integration [Outage/Degradation]
**Status**: [Investigating/Identified/Mitigating/Resolved]
**Started**: YYYY-MM-DD HH:MM UTC
**Impact**: [Text scoring unavailable / elevated latency / OAuth failure affecting N users]
**Current action**: [Fallback scores active / token refresh in progress / rate limit backoff enabled]
**Next update**: HH:MM UTC

Post-Incident

Document timeline from detection to resolution
Identify root cause (Grammarly outage / token expiry / rate limit exceeded)
Verify all scoring pipelines resumed with accurate results
Add proactive token refresh before expiry (buffer by 10 min)
Implement rate limit monitoring with alerting at 80% threshold
Update fallback logic if edge cases were discovered

Error Handling

Incident Type	Detection	Resolution
Text check timeout	Requests exceeding 10s SLA	Enable timeout + retry with exponential backoff
Suggestion quality degradation	Scores deviate from baseline samples	Log evidence, pin API version, file support ticket
OAuth token failure	401 on all authenticated endpoints	Trigger refresh flow, re-authorize if refresh fails
Rate limit storm	429 responses with Retry-After header	Implement request queuing, reduce concurrency

Resources

Grammarly Developer Docs
Grammarly API Support

Next Steps

See grammarly-observability for monitoring setup and alerting thresholds.

Source: jeremylongshore/claude-code-plugins-plus-skills → skills/.curated/grammarly-incident-runbook/SKILL.md

Also appears in: jeremylongshore/claude-code-plugins-plus-skills/plugins/saas-packs/grammarly-pack/skills/grammarly-incident-runbook/SKILL.md

---name: grammarly-incident-runbookdescription: 'Follow Grammarly incident response runbook for API outages. Use when Grammarly API is down, experiencing errors, or when investigating service degradation. Trigger with phrases like "grammarly down", "grammarly outage", "grammarly incident", "grammarly not responding". '---# Grammarly Incident Runbook## OverviewIncident response procedures for Grammarly writing API integration failures. Covers text check timeouts, suggestion quality degradation, OAuth token failures, and rate limit storms. Grammarly powers real-time writing assistance, so API incidents directly impact user-facing text checking, scoring workflows, and content quality pipelines. Classify severity immediately using the matrix below and follow the corresponding playbook.## Severity Levels| Level | Definition | Response Time | Example ||-------|-----------|---------------|---------|| P1 - Critical | Full API outage, all scoring requests fail | 15 min | 5xx on `/v2/scores` for all requests || P2 - High | OAuth token failures or sustained timeouts | 30 min | All authenticated requests return 401 || P3 - Medium | Rate limit storms or elevated latency | 2 hours | 429 responses, scoring takes 10s+ per request || P4 - Low | Suggestion quality drift or single endpoint issue | 8 hours | Scores returning but correctness values seem off |## Diagnostic Steps```bash# Test API health (unauthenticated)curl -s -o /dev/null -w "HTTP %{http_code}\n" \ https://api.grammarly.com/ecosystem/api/v2/scores# Test authenticated scoringcurl -s -w "\nHTTP %{http_code}\n" \ -H "Authorization: Bearer $GRAMMARLY_ACCESS_TOKEN" \ -H "Content-Type: application/json" \ -X POST https://api.grammarly.com/ecosystem/api/v2/scores \ -d '{"text": "Test sentence for Grammarly API diagnostic health check."}'# Check OAuth token validitycurl -s -o /dev/null -w "HTTP %{http_code}\n" \ -H "Authorization: Bearer $GRAMMARLY_ACCESS_TOKEN" \ https://api.grammarly.com/ecosystem/api/v2/account```## Incident Playbooks### API Outage1. Confirm with unauthenticated health check (see diagnostics)2. Check Grammarly status page and developer announcements3. Activate fallback mode — return placeholder scores to avoid blocking users4. Queue text submissions for retry when API recovers5. Notify downstream consumers that scores are unavailable### Authentication Failure1. Test token validity with the account endpoint diagnostic above2. If 401: OAuth access token has expired — trigger token refresh flow3. If refresh token also fails: re-authorize via OAuth consent flow4. Verify client ID and client secret are correct in environment config5. Deploy refreshed tokens and confirm scoring requests succeed### Data Sync Failure1. Identify if scoring results are stale or inconsistent across requests2. Check if Grammarly updated their scoring model (review changelog)3. Compare current scores against known baseline text samples4. If quality drift confirmed: log evidence and file support ticket5. Consider pinning API version if Grammarly supports versioned endpoints## Communication Template```markdown**Incident**: Grammarly Integration [Outage/Degradation]**Status**: [Investigating/Identified/Mitigating/Resolved]**Started**: YYYY-MM-DD HH:MM UTC**Impact**: [Text scoring unavailable / elevated latency / OAuth failure affecting N users]**Current action**: [Fallback scores active / token refresh in progress / rate limit backoff enabled]**Next update**: HH:MM UTC```## Post-Incident- [ ] Document timeline from detection to resolution- [ ] Identify root cause (Grammarly outage / token expiry / rate limit exceeded)- [ ] Verify all scoring pipelines resumed with accurate results- [ ] Add proactive token refresh before expiry (buffer by 10 min)- [ ] Implement rate limit monitoring with alerting at 80% threshold- [ ] Update fallback logic if edge cases were discovered## Error Handling| Incident Type | Detection | Resolution ||--------------|-----------|------------|| Text check timeout | Requests exceeding 10s SLA | Enable timeout + retry with exponential backoff || Suggestion quality degradation | Scores deviate from baseline samples | Log evidence, pin API version, file support ticket || OAuth token failure | 401 on all authenticated endpoints | Trigger refresh flow, re-authorize if refresh fails || Rate limit storm | 429 responses with Retry-After header | Implement request queuing, reduce concurrency |## Resources- Grammarly Developer Docs- Grammarly API Support## Next StepsSee `grammarly-observability` for monitoring setup and alerting thresholds.---**Source:** [`jeremylongshore/claude-code-plugins-plus-skills`](https://github.com/jeremylongshore/claude-code-plugins-plus-skills) → `skills/.curated/grammarly-incident-runbook/SKILL.md`**Also appears in:** `jeremylongshore/claude-code-plugins-plus-skills/plugins/saas-packs/grammarly-pack/skills/grammarly-incident-runbook/SKILL.md`

jeremylongshore/claude-code-plugins-plus-skills commit c7f62a8ec7

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